Vascular and neural anatomy of the thenar area of the hand: its surgical applications

Superficial branch of the radial nerve regularly contains fibers from the lateral antebrachial cutaneous nerve: A role in neuroma treatment

BACKGROUND

Many surgical strategies aim to treat the symptomatic neuroma of the superficial branch of the radial nerve (SBRN). It is still difficult to treat despite many attempts to reveal a reason for surgical treatment failure. The lateral antebrachial cutaneous nerve (LACN) is known to overlap and communicate with SBRN. Our study aims to determine the frequency of spreading of LACN fibers into SBRN branches through a microscopic dissection to predict where and how often LACN fibers may be involved in SBRN neuroma.

METHODS

Eighty-seven cadaveric forearms were thoroughly dissected. The path of LACN fibers through the SBRN branching was ascertained using microscopic dissection. Distances between the interstyloid line and entry of LACN fibers into the SBRN and emerging and bifurcation points of the SBRN were measured.

RESULTS

The LACN fibers joined the SBRN at a mean distance of 1.7 ± 2.5 cm proximal to the interstyloid line. The SBRN contained fibers from the LACN in 62% of cases. Most commonly, there were LACN fibers within the SBRN's third branch (59%), but they were also observed within the first branch, the second branch, and their common trunk (21%, 9.2%, and 22%, respectively). The lowest rate of the LACN fibers was found within the SBRN trunk (6.9%).

CONCLUSION

The SBRN contains LACN fibers in almost 2/3 of the cases, therefore, the denervation of both nerves might be required to treat the neuroma. However, the method must be considered based on the particular clinical situation.

Persistent median artery and communicating branch related to the superficial palmar arch

Microvascular surgery, plastic and reconstructive hand surgery, and coronary artery bypass surgery call for a microanatomical study of the branching pattern of the superficial palmar arch (SPA). For the anatomical analysis, we used a group of 20 dissected human hands injected with 4% formaldehyde solution and a 10% mixture of melted gelatin and India ink. The morphometric study was performed on 40 human hands of adult persons injected with methyl-methacrylate fluid into the ulnar and radial arteries simultaneously and afterwards corroded in 40% KOH solution for the preparation of corrosion cast specimens. The mean diameter of the SPA, between the second and third common palmar digital arteries, was 1.86 ± 0.08 mm. We identified the persistent median artery (PMA) in 5% of hands. We distinguished the three main groups of the SPAs according to variations in morphology and branching of the arch: Type 1, the long SPA; Type 2, the middle length SPA; and Type 3, the short SPA found in 27.5% of specimens. The communicating branch (CB), a vessel interconnecting the SPA to the closest branch of the radial artery, is classified into two different morphological groups. The third type of incomplete short arterial arch is the most important of the three groups of SPAs. That short SPA is potentially inadequate for restoring circulation after occlusion or radial artery harvesting for coronary artery bypass.

Anatomical study of first palmar intermetacarpal flap in cadavers and application for congenital first web contracture in a child with Apert's syndrome

INTRODUCTION

Reconstructing severe first web contractures often involves using either pedicled forearm flaps, which can cause extensive scarring, or free flaps, which can be highly complex. In this study, we present a local palmar hand flap that overcomes both of these challenges.

METHODS

Ten fresh upper limbs were examined after arterial injection with colored latex. The study focused on identifying the most distal palmar vascular cutaneous branches suitable for designing an elliptical cutaneous flap over the volar intermetacarpal area. This flap's width was approximately 50% of the width of the thenar eminence. Additionally, we present the case of an 8-year-old child with a type 1 Upton's Apert's hand, which exhibited a severe first web contracture.

RESULTS

In seven cadaver hands, one distal cutaneous perforator was found, while in three hands, two perforators were identified. These perforators originated from the thumb radial collateral artery six times, pollex princeps three times, index radial collateral vessels twice, and thumb ulnar collateral vessels twice. The mean perforator diameter was 0.5 mm (ranging from 0.4 to 0.6 mm), and the mean perforator length was 10 mm (ranging from 0.8 to 12 mm). Using this flap bilaterally in our patient resulted in a straightforward procedure that created a broad and functional first web. A total-thickness skin graft was necessary to cover the proximal thenar area, and fortunately, no complications arose. A wide first web with an intermetacarpal angle of 40° ultimately was obtained scoring 8 on the kapandji.

CONCLUSIONS

The first palmar intermetacarpal flap presents itself as a reasonable and uncomplicated option for addressing significant moderate-to-severe first web contractures.

The free Thenar flap for thumb pulp reconstruction: A case report

The thumb is acknowledged to contribute significantly to hand function, accounting for up to 40% of its overall capability. Consequently, injuries affecting the thumb can have a profound impact on the quality of life experienced by patients. When it comes to the surgical reconstruction of thumb injuries, the primary objective is to promptly provide coverage of the affected area with glabrous skin, thus preserving both the length and functionality of the thumb. Managing injuries specifically involving the thumb pulp can be particularly challenging due to the digit's size and vital role. Acquiring an adequate amount of glabrous soft tissue poses a difficulty in such cases. Various reconstructive approaches, encompassing a range of options on the reconstructive ladder, have been documented for thumb pulp injuries. The most popular options include pedicled flaps and free flaps obtained from both the hands and feet. However, a consensus regarding the optimal method for reconstructing the thumb pulp has yet to be reached. We present a case of total thumb pulp reconstruction for a 40 × 30 mm defect using the free thenar flap in a 65-year-old carpenter who sustained a work-related injury. This flap was designed and raised on the superficial branch of the radial artery with a single subcutaneous vein and a branch of the palmar cutaneous nerve, the flap measured 43 × 32 mm. It was inset transversely with an end-to-end arterial anastomosis to the ulnar digital artery, venous anastomosis to the dorsal digital vein and nerve coaptation to the ulnar digital nerve. The postoperative course was uneventful, and the patient was discharged the following day without any complications. Eight months after surgery, the patient was extremely satisfied with the results of the procedure in terms of both function and appearance. The patient had experienced an improvement in function, sensation, and aesthetics. The patient had a QuickDASH disability/symptom score of 15.91 and a QuickDASH work module score of 18.75; the range of motion in the treated thumb was almost the same as the opposite thumb. The patient successfully resumed work three weeks following the procedure, initially with modified duties, and fully regained their work capacity within six weeks. As the patient's primary concern was their ability to return to work, the utilization of a free thenar flap offered several distinct advantages. These included minimal post-operative complications, facilitated by a single operative site, allowing for reconstruction under regional anesthesia. Moreover, the procedure was conducted in a single stage, enabling the patient to be discharged on the same day without the need for further procedures. Furthermore, similar to several other reconstructive options for the thumb, the utilization of a free thenar flap offered the advantage of providing high-quality, like-for-like glabrous tissue.

Anatomical Assessment of Cephalic Vein and Superficial Branch of Radial Nerve Using High-Resolution Ultrasound Imaging

Introduction  The superficial branch of the radial nerve (SBRN) has a risk of nerve injury during cephalic vein (CV) cannulation. Due to the lack of imaging study regarding SBRN and CV relationship, we analyzed the anatomical relationship between the SBRN and the CV using ultrasound (US) imaging. Materials and Methods  In total, 82 upper limbs of 41 healthy volunteers were analyzed. The SBRN and CV were identified at the following three points in the elbow extension and pronation position: at the radial styloid process (point 1), 5 cm proximal to point 1 (point 2), and 10 cm proximal to point 1 (point 3). Results  The distance between the SBRN and CV was 1.1 ± 1.0 mm at point 1, 1.3 ± 1.3 mm at point 2, and 2.1 ± 1.6 mm at point 3. The depth of the SBRN from the surface of the skin was 2.7 ± 0.9 mm at point 1, 3.5 ± 1.1 mm at point 2, and 5.5 ± 1.9 mm at point 3. The percentage of the SBRN that ran beneath the CV was 17.5%, 53.5%, and 92.4% at points 1, 2, and 3, respectively. Conclusion  Ultrasonography can reveal the anatomical relationship between the SBRN and CV.

Cutaneous Perforators and Their Clinical Implications on Intrinsic Hand Flaps: A Systematic Review

Background:

Most hand flaps are local intrinsic flaps because hand perforators are small and fragile. The purpose of this review was to gather anatomical data on cutaneous perforators of the hand and their implications on intrinsic hand flaps.

Methods:

An electronic search was performed through PubMed, Scopus, ScienceDirect, ProQuest, and CINAHL in April 2021. The search terms included “hand,” “palm,” “manus,” “cutaneous artery,” “angiosome,” and “perforasome.” Studies were filtered according to the PRISMA flow chart, and critically appraised using the Quality Appraisal for Cadaveric Studies (QUAC) and Appraisal Tool for Cross-sectional Studies (AXIS).

Results:

A total of 33 studies were included, of which 20 were pure anatomical studies, 10 combined anatomical and clinical studies, and three imaging-based clinical studies. A total of 643 hands and 406 fingers were included. The dorsal aspect of the hand, the dorsal digits, hypothenar, midpalm, thenar, and dorsal wrist consistently have adequate, closely distributed perforators of small diameters and short pedicle lengths. A series of clinical studies proved the success of elevating local perforator flaps on each of these areas.

Conclusions:

The hand contained densely interlinked cutaneous perforators of varying sizes and pedicle lengths. Although some areas of the hand are still unexplored, knowledge on cutaneous perforators of the hand allows the creation of a variety of possibilities for intrinsic hand flap designs.

A Review of Arterial Grafts Used for Microvascular Arterial Reconstruction

Arterial grafts are sometimes used in microvascular reconstruction and their clinical benefit over standard venous grafts is unknown. To determine arterial graft utilization in clinical microvascular arterial reconstruction, a review of the literature was done. PubMed search resulted with 4,352 finds, and after screening for relevance, 11 articles reporting on 55 arterial grafts were analyzed. All reports were retrospective studies, case reports, and case series, with no randomized controlled trials. Two retrospective series reported better patency of arterial versus venous grafts in upper-limb revascularization for chronic occlusion, but the findings were highly biased. Better patency of arterial grafts did not lead to higher rate of clinical improvement. Antiplatelet and lipid-lowering agents seem to be underused in venous graft recipients and use of no-touch venous grafting has not been reported. Based on the available data, routine use of arterial grafts cannot be recommended. Studies that show better patency of arterial grafts in hand revascularization for chronic vascular insufficiency are retrospective and biased, so a randomized controlled trial is needed.

Observation of the Absence of Ulnar Artery in a Patient Planned to Free Dorsoulnar Artery Perforator Flap for Finger Defect: Is Preoperative Doppler evaluation of Perforator Alone Sufficient?

Background Volar finger defects where critical structures exposed are always challenging for plastic surgeons. In these types of defects, local flaps, cross finger flaps, abdominal flaps, and free flaps are used. Free dorsoulnar artery perforator (DUAP) flaps and superficial palmar branch of radial artery (SPBRA) flaps are also used. In this case, we present a patient who was scheduled to receive a DUAP flap to address defect on the second finger of right hand; however, we repaired the defect with a SPBRA flap because intraoperative absence of the ulnar artery was observed.

Materials and Methods A 34-year-old male patient was admitted with a wound that exposed the tendon and neurovascular bundle on the volar side of the second finger of the right hand. A free DUAP flap was planned for the patient. A perforator was detected during the preoperative Doppler ultrasound examination. While dissecting the perforator, we noted the absence of an ulnar artery proximal to the perforator vessel. The elevated SPBRA flap from same extremity and the defect were closed.

Results Postoperative computer tomography showed an absence of the ulnar artery distal to the right antecubital region. No complications were seen in the donor and recipient areas. Long-term motor movements were natural, and the patient's quality of life was good.

Conclusion Determining the perforator site using Doppler alone may not be sufficient in preoperative evaluation of patients scheduled to receive DUAP flaps. Performing an Allen test and using advanced imaging methods can prevent surgeons from encountering a bad surprise.

Reverse Superficial Palmar branch of Radial artery pedicled flap for Palmar and Digital reconstruction: A systematic review of literature with a retrospective case review

Background

Most studies on the superficial palmar branch of radial artery (SUPBRA) flap involve its use as a free flap with only few reports in literature regarding its use as a reverse pedicled flap. This systematic review presents a summary of the available literature on the indications, anatomy, technique, complications and outcomes of the reverse SUPBRA flap and also describes our experience.

Methods

A computer search was performed on the Embase, Medline and Pubmed databases for clinical studies describing the reverse SUPBRA flap in accordance with the standard principles for systematic review and Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines. A retrospective review of cases performed by the senior author was also conducted.

Results

Seven studies qualified for the review with 50 flaps in 50 patients meeting the inclusion criteria. The senior author has performed nine reverse SUPBRA flaps from 2006 to 2015. The flap was found to be most useful for defects of the thumb, index, palm and first webspace. Variations in vascular anatomy may necessitate a change of operative strategy. Venous congestion was common but transient in the majority. Complications were rare and included minor tip necrosis, scar contracture, donor site sensitivity and numbness, thumb adduction contracture and cold intolerance.

Conclusions

The reverse SUPBRA flap is a versatile flap for reconstructing defects of the thumb, index, palm and first webspace. It is quick to raise, has a low donor site morbidity and complication rate and achieves very reasonable functional and aesthetic outcomes.

Fingertip injuries managed by a thenar flap: Follow-up and long-term outcomes of 32 cases

While various techniques are used for the reconstruction of fingertip injuries, the main goals remain the same: preserve finger length, sensation, and function. The thenar flap is a well-described technique and simple procedure in fingertip amputations. This study aimed to evaluate the long-term functional and esthetic outcomes along with patient satisfaction of thenar flaps done for fingertip defects. Thenar flaps used in 32 patients operated between January 2010 and December 2016 were analyzed retrospectively to assess sensory recovery, range of motion, cold intolerance, pain relief, appearance, patient satisfaction, and QuickDASH score. All flaps survived, without adverse events. The flap was detached after 10-14 days (mean 12.5 days). The mean follow-up was 31 months (range, 20-45 months). According to Semmes-Weinstein monofilament test results, protective sensation was achieved in 25 patients (78%). The mean static 2-point discrimination was 6.1 mm. There were no functionally significant finger flexion contractures at the final follow-up. Complications such as pain, donor site morbidity and cold intolerance were not encountered. The thenar flap is an excellent technique for coverage of total or subtotal tissue loss of radial-side fingertips that is not accessible to local flaps. It provides good sensory function and appearance when fundamental technical principles (flap design, timing of division, and early mobilization) are respected.

A systematic review of outcomes following hand reconstruction using flaps from the superficial palmar branch of the radial artery (SUPBRA) system

BACKGROUND

Flaps based on the superficial branch of the radial artery (SUPBRA) are indicated when homo- or heterodigital flaps are inappropriate, but glabrous or like-for-like reconstruction is required.

AIM

To systematically review the outcomes of hand reconstruction using SUPBRA flaps.

METHODS

PubMed was searched for English-language articles studying SUPBRA flaps in November 2019. Data collected included flap vascular supply, dimensions, complications, donor site closure, and two-point discrimination.

RESULTS

Twenty-six papers were eligible (410 flaps). Flaps were classified as glabrous, nonglabrous or combined. Nonglabrous flaps were either free- (52%) or reverse-flow pedicled (1.7%) wrist flaps. Glabrous flaps were either free palmar (36.3%), reverse-flow pedicled palmar (2%), antegrade-flow pedicled palmar (0.2%) or perforator-based island palmar flaps (3.7%). Combined glabrous/nonglabrous flaps formed 4.1% of flaps. Maximal flap dimensions allowing direct closure were: 3.1 × 6 cm for wrist flaps and <3 × 10 cm for glabrous palmar flaps. Combined flaps can be 10 × 16 cm. Overall, complete and partial flap failure rates were 3.17% and 0.98%, respectively. Most complete failures were due to venous thrombosis. All 220 wrist donor sites were closed directly. Two out of 173 palmar donor sites (≥3.1) could not be primarily closed. Wound complications were rare, but 53.4% of free palmar flaps required debulking. The results of neurorrhaphy were inconsistent.

CONCLUSIONS

Flaps based on the SUPBRA are robust, provide like-for-like reconstruction of glabrous skin defects in one-stage, offer versatility due to diverse skin paddle orientation patterns and are in the same operative field as the defect.

Flaps Based on Palmar Vessels

The glabrous skin of the palm provides the best color and texture match for reconstruction of palmar aspect of fingers following the principle of reconstructing like with like. Few local axial and perforator flaps have been described of the palm for reconstruction of finger defects. This article reviews the various local flaps based on palmar vessels for digital reconstruction and shares the authors' experiences with similar flaps. Indications, clinical applications, surgical anatomy, and operative techniques of different flaps from palmar tissues are discussed. The authors suggest using these flaps for proximal and smaller defects on the palmar aspect of fingers.

VY Advancement, Thenar Flap, and Cross-finger Flaps

The VY advancement, thenar flaps, and cross-finger flaps are workhorse flaps used in reconstruction of fingertip defects. They are reliable and simple to raise without need for microvascular dissection. In addition, they usually provide good results in terms of sensibility and range of motion. This article reviews the history, anatomy, and surgical technique of these flaps with a focus on aesthetic refinements with illustrative cases.

The free neurovascular transverse wrist crease flap for repairing soft tissue defects of the fingers: clinical outcomes of multiple centers

Background

Flap transplantation is often needed for soft tissue defects of the fingers that cannot be closed directly. Sensory reconstruction of the fingers is important for patients to recover feelings. In this study, we report clinical outcomes of using free neurovascular transverse wrist crease flap for repairing finger defects from multiple centers.

Methods

This case series includes 72 consecutive patients with finger defects between June 2013 and June 2016 from multiple centers. A neurovascular transverse free radial artery superficial palmar branch flap, named transverse wrist crease flap, was designed to reconstruct soft tissue defects of the fingers with microvascular anastomosis. When there were soft tissue defects of the fingers with digital nerve defect, end-to-end neurorrhaphy between the median palmar cutaneous branch and the digital nerves was also performed. The donor incision was sutured directly. All the patients were followed-up for more than 24 months.

Results

The soft tissue defects of the fingers were all completely covered with this free neurovascular transverse wrist crease flap, and the flaps in 71 patients survived completely without ischemia. Vascular crisis appeared in one case, and the wound healed gradually after changing wound dressing for nearly 1 month. Slight infections of wounds appeared in eight cases. There were no complications in the donor site, like infection and poor wound healing. At the last follow-up, the mean static two-point discrimination was 9.6 ± 2.4 mm on the injured finger and 4.5 ± 0.8 on the contralateral corresponding finger. The motion range of the distal interphalangeal joint and proximal interphalangeal joint on the injured finger were 72.5 ± 23.3% and 78.7 ± 32.5% of the contralateral corresponding finger, respectively. Patient self-evaluations were good in 53 cases and fair in 19 cases.

Conclusions

The results indicate that the free neurovascular transverse wrist crease flap is a good choice for repairing soft tissue defects of the fingers.

Level of evidence

Therapeutic IV

Reverse Thenar Perforator Flap for Large Palmar and Digital Defects

Reconstruction of large, full-thickness palmar and digital defects is challenging. The glabrous skin of the palm provides excellent color and texture match for palmar hand and digital defects. The reverse thenar perforator flap, which was previously infrequently used, provides a method for primary closure of large glabrous palmar skin defects. Because of the origin of the source vessels, the reverse thenar perforator flap is a good choice for larger radial-sided palmar and finger defects. This flap provides good aesthetic results for both the donor and the recipient.

[Application of free superficial palmar branch of radial artery flap in repairing of soft tissue defect of fingers]

Objective

To evaluate the surgical technique and the effectiveness of the free superficial palmar branch of the radial artery flap to repair soft tissue defect of fingers.

Methods

Between June 2014 and June 2017, 10 cases (10 fingers) of soft tissue defects of fingers were repaired with the free superficial palmar branch of the radial artery flaps. There were 8 males and 2 females with an average age of 29.8 years (range, 23-42 years). The causes of injury included the chainsaw cutting injury in 6 cases, the machine crush injury in 2 cases, and the glass scratching in 2 cases. The time from injury to admission was 1-8 hours with an average of 3 hours. The locations were the volar of the middle of index finger in 3 cases, the volar of the distal of index finger in 1 case, the volar of the distal of middle finger in 3 cases, the ulnar side of distal interphalangeal joint of ring finger in 1 case, and the volar of the distal of the little finger in 2 cases. The area of soft tissue defect ranged from 1.8 cm×0.9 cm to 2.8 cm×2.1 cm, and the area of flap ranged from 2.0 cm×1.0 cm to 3.0 cm×2.3 cm. The donor sites were sutured directly.

Results

All flaps survived after operation, and the wounds healed by first intention. The incisions of donor site also healed by first intention with a linear scar. All cases were followed up 6-12 months (mean, 9 months). The appearance and texture of the flaps were satisfactory. The pain sensation, warm sensation, and touch sensation of the flap recovered. At last follow-up, the two-point discrimination of the flap was 6-13 mm (mean, 7.5 mm). According to the assessment of the upper limb function issued by tha Hand Surgery Society of Chinese Medical Association, the results were graded as excellent in 8 cases and good in 2 cases.

Conclusion

The free superficial palmar branch of the radial artery flap is easy to harvest and anastomose and has small injury. It is an ideal method in repairing of soft tissue defects of fingers.

Diagnostic Wrist Arthroscopy

After reviewing this article, readers should have a comprehensive understanding of the indications for diagnostic arthroscopy, technical considerations in performing a systematic evaluation of the wrist, and limitations of this technique.

The use of innervated radial artery superficial palmar branch perforator free flap for complex digital injuries reconstruction

Loco-regional flaps have been widely used for the reconstruction of digital injuries without requiring microvascular anastomosis, however, they result in scarring and compromised functional outcomes. This study demonstrates our experience utilizing the innervated radial artery superficial palmar branch (RASPB) perforator free flap for complex digital injury reconstruction. From May 2007 to March 2014, the innervated RASPB perforator free flap was used to reconstruct 79 distal complex hand and digital soft tissue defects of which 14 were used to re-vascularise the distal digit in a flow-through fashion. All free flaps were innervated by the palmar cutaneous branch of the median nerve. All 79 free flaps survived and all 14 digits re-vascularized successfully. One flow-through free flap developed distal skin necrosis which healed uneventfully without further procedure. The average follow-up was 21.5 months. Measurement of two-point discrimination ranged from 7 to 13 mm. All patients were satisfied with the aesthetic results. The innervated RASPB perforator free flap is a feasible and effective option for the reconstruction of complex digital defects and the flow-through concept, when utilized in cases with compromised vascularity, provides reliable re-vascularization. Level III, therapeutic study.

Microsurgical Flaps in Repair and Reconstruction of the Hand

The authors' strategy for soft-tissue coverage of the hand is presented. The concept of replacing like with like and reconstruction with similar adjacent tissue enhances functional and aesthetic outcomes. In this viewpoint, the pedicle perforator flap is an ideal flap. A decision-making algorithm to select an ideal flap for a particular hand defect is challenging, requiring experiential consideration of functional outcome, appearance, donor-site morbidity, and patient satisfaction. To assist surgeons in determining the most appropriate flap with more evidence, studies are necessary to compare the outcomes of each flap by evaluating hand function, aesthetics, donor site morbidity, and patient satisfaction.

Technical Points of 5 Free Vascularized Flaps for the Hand Repairs

In this article, we present the experiences from Chinese microsurgeons on 5 less commonly used free vascularized flaps in hand reconstruction. In many units in China, these flaps have become the mainstays of treatment; they are routinely used for fingertip and thumb reconstruction. Their combined experience has demonstrated the reliability and versatility of these flaps for hand reconstruction, as well as their cosmetic value.

Anatomical Study of Cutaneous Venous Flow of the Palm

BACKGROUNDS

Various flaps elevated from the palm have been widely used for finger and hand reconstruction. Recently, perforator-based free flaps or venous free flaps have received popularity due to several advantages. The cutaneous venous system has been chosen as the circulatory outlet when designing and harvesting the flap from the palmer area due to the small size and thin nature of the flap. However, there have been few descriptions about the anatomy of the palmar cutaneous veins. A more detailed knowledge will be valuable for elevating various flaps from the palmar area.

METHODS

Whole-body and hand venography with a contrast medium was performed on 9 fresh cadavers. Dissection and investigation of the skin and subcutaneous tissue were performed using a soft x-ray system with a stereogram. During all the processes that involved elevating the tissue, observations were made on the macroscopic structure of the palmar vein.

RESULTS

In the palm, a complex network of veins are connected with the distal branches of the cephalic vein, basilic vein, and dorsal venous arch. The pattern and geometric formation of the venous network in all cases showed distinctive features according to each region of the palm. The venous branches create a network extending to palmar margins and webs between fingers.

CONCLUSIONS

Venous arrangement should be considered when designing flaps from the palm to prevent venous congestion and safely extend the length of the flap.

Reconstruction of totally degloved fingers: a novel application of the bilobed spiraled innervated radial artery superficial palmar branch perforator flap design provides for primary donor-site closure

INTRODUCTION

To investigate the results of resurfacing completely degloved digits using bilobed innervated radial artery superficial palmar branch (RASPB) perforator flap in a spiral fashion.

METHODS

A detailed anatomic study on 30 adult fresh frozen cadavers preinjected with silicone rubber compound to demarcate arterial anatomy documented locations, numbers, and diameters of arteries and skin perforators with surrounding nerves. The flap-raising procedure was performed using four fresh cadaver specimen. We reviewed the reconstruction of 12 digits by using a bilobed spiraled innervated RASPB free perforator flap after non-replantable degloving injury. Two skin paddles were marked out using standard points of reference. At least two separate cutaneous perforator vessels were identified using a hand-held Doppler and were dissected back to the RASPB in retrograde fashion. The skin paddles were then divided between the two cutaneous perforators to provide two separate paddles with a common vascular supply. The skin paddles were stacked in a spiral fashion on the flap inset, effectively increasing the width of the flap to cover the totally degloved finger while still allowing closure of the primary donor-site.

RESULTS

The RASPB was present within the flap in all cadavers. The direct perforator and the musculocutaneous perforator were available in 93.33 and 76.67 %, respectively, with neither of them in 6.67 % of the cases. The constantly present two perforators allowed the design of a new bilobed spiraled innervated radial artery superficial palmar branch perforator flap. We used the proposed flap to reconstruct completely degloved digits in 12 patients (mean age 28.6 years; range 17-35 years). With our proposed flap, no flap failure or re-exploration occurred and the donor site was closed primarily in all cases. All the flaps survived uneventfully. Total active motion ranged from 92° to 140° and 111° to 155° in the cases with and without metacarpophalangeal joint involvement, respectively. The static 2 point discrimination test varied from 6 to 11 mm. All the patients were satisfied with the overall results.

CONCLUSION

The bilobed flap is large enough to cover totally degloved finger defects and contain direct skin perforators, provides a bespoke cover for complex soft tissue defects of completely degloved digits while also improving morbidity and cosmesis of the donor site.

LEVEL OF EVIDENCE

Level IV, retrospective series.

Thumb Replantation Using the Superficial Palmar Branch of the Radial Artery

The thumb is the most important part of the hand. If thumb is amputated, all efforts should be made to replant it to preserve hand functions. Good functional outcome can be obtained with successful thumb replantation than with other reconstructive surgery. We present a case of thumb amputation of a 44 -year-old male with severe damage to the soft tissues and bony structures of the radial part of the hand. We performed the replantation anastomosing the superficial palmar branch of the radial artery as donor artery as the proximal part of thumb digital arteries were severely damaged due to crush injury and got favorable result.

Thumb reconstruction via a pedicled flap based on the superficial palmar branch of the radial artery from the wrist crease area

BACKGROUND

The free flap based on the superficial palmar branch of the radial artery (SPBRA) has been extensively reported. A reversed pedicled flap based on the SPBRA, harvested from the wrist crease area, can be a potential candidate for the reconstruction of the soft-tissue and artery defects in the thumb.

METHOD

Between January 2012 and October 2013, this flap was used in seven patients to reconstruct soft-tissue defects in the thumb. In three patients, blood circulation of the thumb was reestablished using flow-through flaps. The Michigan Hand Outcomes Questionnaire was used for patient self-evaluation.

RESULTS

In one patient, the surgery was abandoned due to blood vessel variation. All the flaps and thumbs survived in the other six patients. The wounds healed primarily. All patients were followed up for a mean of 16.5 months (range, 12-26 months). At the last follow-up, the mean static two-point discrimination was 7.3 ± 0.9 mm on the affected side and 4.6 ± 0.7 on the contralateral side. The range of motion of the metacarpophalangeal joint and the interphalangeal joint were 66.8 ± 8.4° (contralateral, 85.2 ± 3.8°) and 67.0 ± 6.9° (contralateral, 80.5 ± 5.0°), respectively. Patient self-evaluations were good in five cases and fair in one case.

CONCLUSION

The reverse island flap based on the SPBRA is feasible for soft-tissue defects and establishing blood circulation in the thumb. The donor site can be closed primarily, and the scar is inconspicuous in the wrist crease.

Anatomical Study of the Princeps Pollicis Artery Perforator Flap

BACKGROUND

The volar aspect of the thumb often requires local flaps for reconstruction. This study characterizes perforators of the princeps pollicis artery (PPA) and evaluates the potential of a local propeller-type flap raised using these perforators for reconstruction of these defects.

METHODS

Cadavers underwent whole-body lead-oxide injection and were then imaged using a 64-slice spiral computed tomographic scanner. The DICOM images were imported into Materialise's Interactive Medical Imaging Control System (Materialise, Belgium) for 3-dimensional reconstruction of the microvasculature. The number, length, caliber, and location of perforators arising from the PPA were determined and a plot was generated illustrating the relative distribution of perforators.

RESULTS

A total of 16 PPA perforators were identified in the 8 specimen hands. Perforators had a mean (SD) diameter of 1.2 (0.4) mm and mean (SD) length of 8.9 (4.8) mm. The PPA perforators were consistently identified along the radial aspect of the thenar region. Seventy percent of all PPA perforators can be found over the distal 50% of the MC [20%-54%; mean (1SD)].

CONCLUSIONS

Perforators of the PPA were found in all hands and the average caliber and length of the perforators identified is sufficient for the creation of a local perforator flap. This, coupled with the mean location of these perforators, arising near the base of the thumb, confirms that a cutaneous flap from the thenar region can be raised based on this perforator as a propeller flap to obtain coverage of distal cutaneous defects of the thumb.

Reconstruction of volar skin and soft tissue defects of the digits including the pulp: experience with the free SUPBRA flap

BACKGROUND

The ideal flap for volar defects on the digits should provide glabrous skin, maintain length, be sensate and supple enough to allow unimpeded motion of the joints. When local flap options are either inadequate or unavailable, this constitutes a challenge that usually requires free tissue transfer. We describe our experience of the use of the free transfer of glabrous skin based on the superficial palmar branch of the radial artery (SUPBRA) for digital (volar) reconstruction.

METHODS

Between May 2005 and June 2011, we used this flap to reconstruct digital defects in 13 patients with mean age of 40.1 years (range 18-68 years) and a follow up range from 0.7 to 3.5 years (mean 1.5 years). The dimension of the flaps ranged from 2 × 5cm to 2 × 10 cm. The indications for surgery included traumatic loss of tissue/amputation, severe pulp space infection, dog bite injury, crush injury/ischaemic loss and salvage of failed local flap. The donor site was closed directly in all cases.

RESULTS

There were no flap failures. All wounds healed with good functional outcomes with ideal tissue match, minimal donor site morbidity and return of protective sensation despite no neurorrhaphy performed except in one patient.

CONCLUSION

The free SUPBRA flap has many advantages, approaching ideal replacement for the volar tissues of the fingers, excellent tissue match, minimal donor site morbidity with an excellent camouflaged scar in the mid palmar crease, one operation field, non sacrifice of a major vessel, can be made 'sensory', neurotises well and offers a single site for rehabilitation. We believe that the free SUPBRA flap is a very reliable and useful option in the armoury of the reconstructive hand surgeon.

A comparative study of four types of free flaps from the ipsilateral extremity for finger reconstruction

AIM

To compare the outcomes of finger reconstruction using arterialized venous flap (AVF), superficial palmar branch of the radial artery (SPBRA) flap, posterior interosseous perforator flap (PIPF), and ulnar artery perforator free (UAPF) flap harvested from the ipsilateral extremity.

METHODS

We retrospectively reviewed the outcomes for 41 free flaps from the ipsilateral extremity in the reconstruction of finger defects in 41 patients with small/moderate skin defects, including 11 AVFs, 10 SPBRA flaps, 10 PIPFs, and 10 UAPF flaps. Standardized assessment of outcomes was performed, including duration of operation, objective sensory recovery, cold intolerance, time of returning to work, active total range of motion (ROM) of the injured fingers, and the cosmetic appearance of the donor/recipient sites.

RESULTS

All flaps survived completely, and the follow-up duration was 13.5 months. The mean duration of the complete surgical procedure for AVFs was distinctly shorter than that of the other flaps (p<0.05). AVFs were employed to reconstruct skin defects and extensor tendon defects using a vascularized palmaris longus graft in 4 fingers. Digital blood supply was reestablished in 4 fingers by flow-through technique when using AVFs. Optimal sensory recovery was better with AVFs and SPBRA flaps as compared with UAPF flaps and PIPFs (p<0.05). No significant differences were noted in ROM or cold intolerance between the 4 groups. Optimal cosmetic satisfaction was noted for the recipient sites of AVFs and the donor sites of SPBRA flaps. The number of second-stage defatting operations required for AVFs was considerably lesser than that for the other flaps.

CONCLUSION

All 4 types of free flaps from the ipsilateral extremity are a practical choice in finger reconstruction for small/moderate-sized skin defects. AVFs play an important role in such operations due to the wider indications, and better sensory recovery and cosmetic appearance associated with this method.

The microvascular thenar flap as a new possibility for super-thin soft tissue reconstruction in the oral cavity--initial clinical results

We report the first clinical use of a free microvascular thenar flap for reconstruction of intraoral soft tissues. In 9 patients with a recurrent oral squamous cell carcinoma (SCC), a new primary oral SCC, or a defect of the hard palate after radiotherapy, we covered the soft tissue defect, after resection of the tumour or local preparation, with a microvascular thenar flap. All patients had had combined resection and irradiation for treatment of the initial tumour. In every case the thenar flap was harvested from the left forearm. Arteries were anastomosed to cervical arteries on either side. The veins were anastomosed to the deep jugular or subclavian vein. Patients were followed up clinically after 3, 6, and 12 months and radiologically every 6 months. The mean length of the pedicle was 21 cm. The mean width of the flap was 27 mm (range 24-30) and the mean length 37 mm (range 26-49). All anastomoses worked well. All flaps healed without major complications. A thin but stable layer of soft tissue resulted in every case. All patients were able to wear their prostheses. Good functional and aesthetic results were seen at each follow-up visit, and there were no signs of relapse. The microvascular thenar flap is well-suited for reconstruction of thin layers of soft tissue in the oral cavity. The long pedicle and hairlessness are also ideal for covering intraoral defects after previous operations and in necks with few if any vessels. Primary wound closure is possible in many cases.

Pedicled (antegrade) SUPBRA flap - for wound cover on volar aspect of thumb

A dictum of reconstruction is to replace like with like. Therefore, glabrous skin is best replaced with like tissue from the palm or the soles of the feet. We have previously presented our experience with free tissue from the palm based on the superficial palmer branch of the radial artery to reconstruct defects on the volar aspect of the digits following the original description of this flap by Kamei et al. There are situations where an antegrade pedicled flap from this area lends well as a choice for reconstruction. We describe the use of a pedicled flap from this axis for a defect on the radial aspect of the thumb and we believe it is the first report of its kind.

False aneurysm of the common digital artery. Is reconstruction with an arterial graft worth the efforts? A case report

False aneurysms in the hand are rare. A false aneurysm of the common digital artery in the palm for the second and third finger is reported, illustrating our experience with arterial graft reconstruction after excision as a valid alternative surgical therapy to a vein graft, when ligation or end-to-end anastomosis are not indicated or feasible. The superficial palmar branch of the radial artery was chosen as donor vessel based on the similarity in vessel diameter and wall thickness to the common digital arteries. Ease of harvesting and performing the microvascular anastomosis using an arterial graft allows for a viable reconstruction after false aneurysm excision in the palm.

Medial and lateral branches of the superficial radial nerve: cadaver and nerve conduction studies

OBJECTIVE

To establish a reliable technique for nerve conduction study (NCS) of medial and lateral branches of the superficial radial nerve (SRN).

METHODS

The distribution of SRN and its branches were examined in 10 cadavers. Based on the cadaveric study, anti-dromic nerve conduction studies were performed on 31 healthy subjects.

RESULTS

The SRN became superficial approximately 8.4 cm from the radial styloid process (RS) and divided into medial and lateral branches 4.9 cm proximal to RS. The medial branch divided into two branches: proximal to extensor pollicis longus (EPL) tendon in 16 hands. The lateral branch ran parallel and 0.2 cm lateral to abductor pollicis longus (APL) tendon. Sensory nerve action potential (SNAP) was significantly shorter in latencies when recording over snuff box, compared with that from the EPL and APL tendons. SNAP obtained from APL tendon was significantly smaller in amplitude, compared with those from snuff box and EPL tendon.

CONCLUSIONS

Anti-dromic stimulation of SRN should be performed 10 cm proximal to the recording electrode. The optimal recording position for each branch of SRN is snuff box for medial branch, and lateral to APL tendon for lateral branch.

SIGNIFICANCE

The SRN can be evaluated appropriately by NCS of medial and lateral branches of SRN.

The glabrous palmar flap: the new free or reversed pedicled palmar fasciocutaneous flap for volar hand reconstruction

We devised a new flap using the palmar cutaneous branch of the superficial radial artery proximally and anastomosed with a cutaneous perforator of the superficial palmar arch distally. We named our flap "the volar glabrous palmar flap." The flap was used both as a free flap and as a reverse-flow island flap. Thirty-six patients with volar hand defects (24 digits, 7 palms, and 5 first web space) were reconstructed with this flap. The flap was used as a proximally based free flap in 15 patients and was used as a reverse-flow island flap based on distal communication in the remaining 21 patients. Free flaps were supplied by the palmar branch of the superficial radial artery and its fasciocutaneous extensions; reverse-flow island flaps were supplied by one of the perforating branches of the superficial palmar arch, which is connected to the proximal fasciocutaneous branches. Flaps extended from the wrist crease to the proximal palmar crease and were designed medially on the thenar crease, extending 2 to 2.5 cm laterally. Flap sizes ranged from 1.5 x 2.2 cm to 2.5 x 10 cm. The palmar cutaneous branch of the median nerve within the flap area was identified and then was sutured to the divided digital nerve in 6 cases of finger pulp defect. The donor sites were closed and repaired primarily in most cases. The postoperative course was uneventful, and all the flaps survived without major complications. Follow-up (minimum 6 mo, mean 24 mo) showed excellent functional and cosmetic results. Satisfactory sensory reinnervation was achieved in patients who underwent sensory flap transfer for pulp defects. At the same time, we studied 6 cadaver hands to understand the vascular anatomy of the thenar area of the hand. We also revised several published anatomic papers to obtain a refined and scrutinized understanding of the palmar anatomy.

Relocation of painful neuromas in Zone III of the hand and forearm

Painful nerves are a difficult and complex clinical problem. We describe the result of treatment by proximal relocation of 51 painful end neuromas and scarred nerves of the forearm in 33 patients. The relocated nerves included 29 superficial radial nerves, 16 lateral antebrachial cutaneous nerves, two medial cutaneous nerves and four posterior cutaneous nerves. These relocations achieved no, or only mild, pain in 100% of nerves at the original site and 94% of nerves at the relocation site. It also achieved no, or only mild, hypersensitivity in 96% of nerves at the original site and 98% of nerves at the relocation site. The technical difficulties encountered in this region, in particular on the radial aspect of the wrist, are discussed.

Relocation of neuromas of the lateral antebrachial cutaneous nerve of the forearm into the brachialis muscle

Painful neuromas following injury to the radial side of the wrist can be treated by relocation away from the zone of injury and implantation into muscle. Relocation to the brachialis muscle is useful for isolated neuromas of the lateral antebrachial cutaneous nerve and involves a shorter dissection than relocation to the brachioradialis. It is also useful in patients undergoing multiple procedures to avoid disturbing previous relocations to the brachioradialis. This paper describes the successful relocation of painful neuromas of the lateral antebrachial cutaneous nerve to the brachialis muscle in seven patients.

"A free thenar flap--a case report"

We present a case report of a free thenar flap surgery done for a volar right hand middle finger, distal and middle phalanx degloving injury. A free thenar flap is a fasciocutaneous sensate flap supplied by a constant branch of the superficial radial artery and its variable nerve supply. It has a distinct advantage of low donor site morbidity, better cosmesis and texture of the flap. No immobilization is required postop. The donor site can be closed primarily.

Clinical applications of volar portals in wrist arthroscopy

Volar portals for wrist arthroscopy have certain advantages over the standard dorsal portals for visualizing dorsal capsular structures as well as the palmar aspects of the carpal ligaments. The volar radial portal is relatively easy to use and is an ideal portal for evaluation of the dorsal radiocarpal ligament and the palmar aspect of the scapholunate interosseous ligament. The volar midcarpal portal may be considered as an occasional accessory portal for visualizing the palmar aspects of the capitate and hamate in cases of avascular necrosis or osteochondral fractures. The volar ulnar portal is especially useful for the viewing and debridement of palmar tears of the lunotriquetral ligament.

Anatomic characteristics and clinical importance of the superficial branch of the radial nerve

The aim of this study was to demonstrate anatomic variations of the superficial branch of the radial nerve (SBRN) and to discuss the importance of this branch for surgical approaches. Upper extremities of 24 cadavers without any known history of disease or trauma were examined, the SBRN became subcutaneous at a mean of 9.20 cm and bifurcated at a mean of 4.90 cm proximal to the styloid process of the radius in 48 specimens. At the level of the extensor retinaculum, the mean distance of the closest branch to the first dorsal compartment was 0.54 cm, while its mean distance to the dorsal tubercle (Lister's tubercle) was 1.58 cm. The relations of the three branches of the SBRN (SR1, SR2, SR3) to the anatomic snuffbox and lateral antebrachial cutaneous nerve (LABCN) were also examined. It was demonstrated that on eight wrists, SR2 went through the snuffbox (16.67%). On ten specimens, SR3 had connections with LABCN (20.83%). In four specimens, the SBRN did not have any bifurcation and was directly divided into SR1, SR2, and SR3. It should be very helpful to know the anatomic characteristics of the SBRN, especially for hand surgeons, to minimize the risk of injury of the SBRN during surgical approaches.

Cannulation Injury of the Radial Artery: Diagnosis and Treatment Algorithm

Cannulation of the radial artery can result in complications ranging from arterial thrombosis, arterial aneurysm, compartment syndrome, infection, nerve injury, and skin necrosis to possible thumb or even hand necrosis if not recognized and treated early. The anatomy of the radial artery, the diagnosis of injury, and a treatment algorithm are presented so that potential devastating hand complications can be avoided.