Modified technique for reconstructing reverse Hill-Sachs lesion in locked chronic posterior shoulder dislocation

From Diagnosis to Decision-Making: A Systematic Review of the Management of Reverse Hill-Sachs Lesions after Posterior Shoulder Dislocations

(1) Background: The aim of this study is to describe all of the possible surgical procedures that intend to treat the McLaughlin lesion (or Reverse Hill-Sachs) in posterior shoulder dislocation. (2) Methods: Google Scholar, Pubmed, and Embase were used as databases in our research. Studies reporting the results of posterior shoulder dislocations surgically treated with procedures addressing the humeral lesion were evaluated. The studies reporting results after fracture-dislocation and multidirectional instability were excluded. (3) Results: A total of 16 studies were included in our review for a total of 207 shoulders with a mean age of 41.7 years that were evaluated at a mean of 62.1 months. The Modified McLaughlin procedure and the Graft procedures were the most commonly performed. No statistically significant difference was found between the two at the evaluation of the clinical score. (4) Conclusions: Our review highlights the importance of a correct diagnosis and an accurate surgical treatment choice based on the surgeon's experience and on the patients' characteristics.

Clinical and radiographic outcomes of the modified McLaughlin procedure for locked posterior dislocation of the shoulder: a systematic review

Background

Multiple treatment options for locked posterior dislocation of the shoulder (LPDS) have been described, including the modified McLaughlin procedure. The purpose of this review, therefore, was to perform a systematic review of the literature to synthesize the available data reporting on the clinical and radiographic outcomes of patients undergoing the modified McLaughlin procedure for the treatment of LPDS.

Methods

A systematic review of the PubMed Central, MEDLINE, Embase, Scopus, Web of Science, and Cochrane Library databases from inception through January 2023 was performed. Outcomes studies reporting on clinical and radiographic outcomes in patients undergoing the modified McLaughlin procedure for LPDS were included. Postoperative complications and episodes of recurrent instability were noted.

Results

A total of 1322 studies were initially identified, of which 9 were deemed eligible for inclusion in our review. Among included studies, a total of 97 shoulders (96 patients) with a mean age of 37.7 years (range, 26-51) were identified. The most common mechanisms of injury included trauma, seizure, and electrocution. Reverse Hill-Sachs lesions ranged in size from 20% to 50% of the humeral head articular surface. At final follow-up, the weighted mean University of California at Los Angeles shoulder score, Constant-Murley Score, American Shoulder and Elbow Surgeons shoulder score, and visual analog scale for pain score were 29 (range, 27-31), 75 (range, 65-92), 92 (range, 83-98), and 1.9 (range, 1-2.4), respectively. Postoperative Constant-Murley Score and University of California at Los Angeles scores were highest in the one study reporting exclusively on treatment during the acute period. Weighted mean postoperative forward flexion, abduction, external rotation, and internal rotation were 154° (range, 102-176), 144° (range, 118-171), 64° (range, 44-84), and 47° (range, 42-56), respectively. Osteointegration of the lesser tuberosity was noted in all patients at the final follow-up. Postoperative complications occurred in one patient (1.0% of cohort); a screw migration successfully treated with operative removal. Recurrent instability was noted in two epileptic patients (2.1% of cohort).

Conclusion

The literature surrounding the use of the modified McLaughlin procedure for LPDS remains sparse. This review demonstrates that this procedure is associated with favorable clinical and radiographic outcomes with overall low rates of complication and recurrent instability, especially when the time from injury to surgery is minimized. These findings illustrate that in patients presenting with LPDS and a reverse Hill-Sachs lesion between 20% and 50% of the humeral head articular surface, the modified McLaughlin procedure is a safe and effective treatment option.

McLaughlin technique and humeral grafting provide similar results for treatment of reverse Hill-Sachs lesions: A systematic review

Purpose

Various surgical treatments have been described for the treatment of reverse Hill-Sachs lesions (rHSls) sized between 20% and 50% in the case of posterior shoulder dislocation. The aim of this systematic review is to report the clinical and radiological outcomes of subscapularis or lesser tuberosity transfer (McLaughlin and modified procedures) compared to bone or osteochondral autograft or allograft.

Methods

A systematic review was performed on five medical databases up to December 2022. The inclusion criteria were clinical studies of all levels of evidence describing clinical or radiological outcomes of either procedure. The assessment of the quality of evidence was performed with the Modified Coleman Score.

Results

A total of 14 studies (five prospective and nine retrospective) were included. A total of 153 patients (155 shoulders, 78.4% male) with a mean age of 37.2 (22-79) years were reviewed at an average follow-up of 53.1 (7.1-294) months. No relevant difference was found for the clinical scores, range of motion, complications and redislocation rate between the two treatments. Radiological osteoarthritis (OA) was reported in 11% (10/87) in the McLaughlin group and in 21% (16/73) in the humeral reconstruction group.

Conclusions

McLaughlin and anatomic humeral reconstruction lead to similar satisfactory clinical results and a low redislocation rate in the treatment of rHSls. Anatomic humeral reconstruction seems associated with an increased risk of OA progression.

Level of Evidence

Level IV.

Low Recurrence of Instability and Satisfying Patient-Reported Outcomes Following Various Surgical Treatments of Reverse Hill-Sachs Lesions in the Setting of Posterior Instability: A Systematic Review

PURPOSE

To systematically review the literature and report the outcomes of various surgical treatments for reverse Hill-Sachs lesions (RHSL) in the setting of posterior shoulder instability.

METHODS

Preferred Reporting Items for Systematic Reviews and Meta-Analyses guidelines were followed. All studies assessing outcomes of surgical treatment of RHSL from inception to January 2023 were identified in PubMed, Embase, and Cochrane Library. Inclusion criteria consisted of studies reporting outcomes, minimum mean 1-year follow-up, and minimum Level IV evidence. Outcomes were assessed using Forest plots with random effects models using R software.

RESULTS

A total of 29 studies consisting of 291 patients were included with a mean age of 42 years (range 16-88 years), 87% male gender, and mean follow-up of 4.5 years. The mean size of impacted or affected cartilage was 35%, and time from injury to surgery was mean 15 weeks. Nearly all studies were Level IV evidence, and quality of studies was low. Random effect models were performed, and data are presented as range. A low incidence of instability was noted for all surgical techniques with good patient-reported outcome measures. Most studies reported outcomes of the modified McLaughlin procedure (13 studies, 126 patients) with overall Constant-Murley Score of 65 to 92. Trends were seen towards better Constant-Murley Score and external rotation with a shorter delay between injury, and when arthroscopic and joint preserving treatments were performed.

CONCLUSIONS

This systematic review showed low rates of instability recurrence, reproducible range of motion, and favorable patient-reported outcome measures were reported following all treatments for RHSLs with posterior instability. There was a significant association between better outcomes and a shorter delay between injury and surgery. The level of evidence is limited, given the small and retrospective studies which can be explained by the rarity of these injuries. LEVEL OF EVIDENCE: Level IV; systematic review of Level IV or better investigations.

How much force is acting on the shoulder joint to create a Hill-Sachs Lesion or reverse Hill-Sachs Lesion?

BACKGROUND

It has not been clarified yet how much force is acting on the shoulder joint to create Hill-Sachs/reverse Hill-Sachs lesions which are commonly observed in patients with anterior or posterior shoulder instability. The purpose of this study was to determine the magnitude of force to create these bony lesions using cadaveric shoulders.

METHODS

Fourteen fresh-frozen cadaveric shoulders were used. Compression tests were performed using the universal testing machine. The specimens were randomly divided into two groups. In group A, the posterior humeral head (the bare area and articular cartilage) was first compressed against the anterior glenoid rim to simulate a Hill-Sachs lesion, followed by the anterior humeral head being compressed against the posterior glenoid rim. In group B, the same procedure was repeated in the reverse order. X-ray microcomputed tomography (microCT) was also performed.

RESULTS

The maximum compression force to create a Hill-Sachs lesion was 771 ± 214 N (mean ± SD) on the articular cartilage of the posterior humeral head, which was significantly greater than the force of 447 ± 215 N to create it on the bare area (P = 0.0086). Regarding the reverse Hill-Sachs lesions, the maximum compression force was 840 ± 198 N when it was created on the articular cartilage of the anterior humeral head, which was significantly greater than the force of 471 ± 100 N when it was created at the footprint of the subscapularis tendon (P = 0.0238). MicroCT showed multiple breakage of the trabecular bone.

CONCLUSION

A force to create a Hill-Sachs lesion or a reverse Hill-Sachs lesion was significantly greater when it was created on the humeral articular cartilage than at the non-cartilage area. Also, the force to create a reverse Hill-Sachs lesion was significantly greater than the one to create a Hill-Sachs lesion.

A novel modified McLaughlin surgery for treating locked chronic posterior shoulder dislocation

BACKGROUND

Posterior shoulder dislocation is an uncommon orthopaedics injury and is frequently missed or misdiagnosed, accounting for 2%-4% of all shoulder dislocations, and is associated with the reverse Hill-Sachs lesion. Once posterior shoulder dislocation develops into a chronic disease, it will bring a lot of trouble to the treatment, especially in repairing the humeral defects. Surgical strategies are also developing and innovating to deal with this injury, including transfer of subscapularis tendon or lesser tubercle, humeral rotational osteotomy, autogenous bone graft or allograft. Shoulder replacement seems to be the ultimate and only option when the injury becomes irreparable, although some studies have shown unsatisfactory follow-up results. Considering no gold-standard treatment for locked posterior shoulder dislocation, we described a novel modified McLaughlin procedure for locked chronic posterior shoulder dislocation and evaluated the functional outcomes.

METHODS

This study included five locked chronic posterior shoulder dislocation patients with an associated reverse Hill-Sachs lesion, in which the compression surface covered 30-40% of the humeral head. The mean period from injury to receiving surgery was 11.6 weeks (6-24 weeks). All five patients underwent the modified McLaughlin procedure, mainly divided into three steps, including open reduction, transfer of the partial lesser tuberosity and artificial bone to repair the reverse Hill-Sachs defects. The kernel technique was to fix the transferred tuberosity with two lag screws and strengthen it with two Ethibond sutures. The Constant-Murley score (CMS), the range of shoulder motion and the complications were recorded to assess and compare the functional situation of the shoulder postoperatively and postoperatively.

RESULTS

After an average of 19.8 months (12-30) of follow-up, the mean CMS improved to 85.8 ± 4.9 (79-91) compared with 46.0 ± 4.5 (40-52) preoperatively, which showed a significant difference (p = 0.001). In the final follow-up, all five patients showed no symptoms of shoulder instability, and there was no pain or limited activity in daily life, thus all patients were satisfied with the results.

CONCLUSION

Repairing the reverse Hill-Sachs lesion by transferring the partial lesser tuberosity combined with artificial bone fixed by lag screws and sutures can ensure shoulder stability and provide pain relief and good function in patients with locked chronic posterior shoulder dislocation associated with the humeral head defect.

Treatment and outcomes of chronic locked posterior shoulder dislocations: a retrospective case series

BACKGROUND

Posterior shoulder dislocations are rare injuries that are often missed on initial presentation. Cases left untreated for more than three weeks are considered chronic, cannot be reduced closely (they become locked) and are usually associated with a significant reverse Hill-Sachs defect. The aim of this study was to evaluate the outcomes of chronic locked posterior shoulder dislocations treated with the McLaughlin procedure (classic or modified).

METHODS

This retrospective study included 12 patients with chronic locked posterior shoulder dislocation operated on between 2000 and 2021 by two surgeons in two institutions. Patients received a thorough clinical examination and radiological assessment before and after surgery. Shoulders were repaired with the McLaughlin or modified McLaughlin procedure. Outcomes were assessed by comparing pre- and postoperative values of clinical variables.

RESULTS

Most of the dislocations were of traumatic origin. The average delay between dislocation and surgical reduction was 13.5 ± 9.7 weeks. Postoperative clinical outcomes were favourable, with an average subjective shoulder value of 86.4 ± 11.1 and a normalized Constant -Murley score of 90 ± 8.3. None of the patients had a recurrence of shoulder dislocation, but one patient developed avascular necrosis of the humeral head and two patients developed glenohumeral osteoarthritis.

CONCLUSIONS

In this group of patients with chronic locked posterior shoulder dislocation, the clinical outcomes of McLaughlin and modified McLaughlin procedures were satisfactory, even when surgery was significantly delayed.

Chronic posterior dislocation of shoulder

PURPOSE

Chronic posterior dislocation of shoulder (PDS) is an uncommon injury and there are very few publications describing its different injury patterns and their treatment. This study was carried out to study the associated injuries in chronic PDS, which can help to classify and guide the treatment.

METHODS

We retrospectively studied 16 chronic posterior dislocation of shoulder. CT scan was used to classify the injury based on the amount of bone loss in humeral head, malunion of greater tuberosity and malunion of proximal humerus metaphysis. Visual analogue score (VAS) for pain, university of California Los Angles (UCLA) shoulder score and American shoulder and elbow surgeon (ASES) shoulder score were recorded pre operatively and at an average of 27 months post operatively.

RESULTS

- Type A1 injury was PDS with <50% humeral head bone loss with intact greater tuberosity (GT). It was managed by modified McLaughlin procedure (MMP). Type A2 injury was PDS with >50% bone loss with intact GT. It was managed by hemi-replacement (HRA). Type B1 injury was PDS with <50% bone loss with severe GT malunion. It was managed by MMP and corrective osteotomy of GT. Type B2 injury was PDS with >50% bone loss and severe GT malunion. It was managed by reverse shoulder arthroplasty (RSA). Type C1 injury was PDS with <50% bone loss and metaphyseal malunion. It was managed by MMP and osteotomy of proximal humeral metaphysis. Type C2 injury was PDS with >50% bone loss and metaphyseal malunion. It was managed by HRA. The VAS, UCLA score and ASES score improved significantly after the surgery in all cases. There was no recurrence of the instability.

CONCLUSIONS

We concluded that chronic PDS could have fractures of tuberosities and/or proximal metaphysis in addition to bone loss in humeral head. The treatment is guided by all three factors-amount of bone loss in humeral head, malunion of GT and proximal humeral metaphysis. The proposed classification can help in choosing the optimum treatment out of joint salvage procedure, anatomic shoulder replacement and reverse shoulder arthroplasty.

Chronic locked posterior gleno-humeral dislocation: technical note on fibular grafting for restoration of humeral head sphericity

Background

Reconstruction of reverse Hill-Sachs defect using osteo-chondral allograft has the advantages of spherical re-contouring and provision of smooth biological articular surface of the reconstructed humeral head. However, worldwide availability and risk of disease transmission of osteo-chondral allograft remain points of increasing concerns. As an alternative to lacking osteo-chondral allograft, the current technical note describes a reconstructive technique of reverse Hill-Sachs defect using autologous fibular grafting.

Methods

Following open reduction of the dislocated humeral head, reverse Hill-Sachs defect was reconstructed using 3–4 autologous fibular pieces (each is of 10 mm in length) fixed in flush with the articular cartilage using 4-mm cancellous screws. Defect reconstruction was then followed by modified McLaughlin’s transfer and posterior capsulorrhaphy.

Results

Spherical contour of the humeral head and gleno-humeral range of motion were restored. Intra-operative dynamic testing of the reconstruct revealed no residual posterior gleno-humeral instability.

Conclusion

Currently reported technique might offer advantages of graft availability, technical simplicity, familiarity and reproducibility, safety (i.e. no disease transmission) and bone preservation facilitating future revision management (if needed). Nevertheless, long-term outcomes of this technique should be investigated via further cohort clinical studies.

Supplementary Information

The online version contains supplementary material available at 10.1186/s13018-021-02835-2.

Arthroscopic reduction and subscapularis remplissage (ARR) of chronic posterior locked shoulder dislocation leads to optimized outcomes and low rate of complications

PURPOSE

Unrecognized posterior shoulder dislocation with a concomitant humeral head fracture affects joint function and no consensus exists regarding treatment. The present study analyses clinical and radiographic outcomes of a novel arthroscopic technique for reducing chronic locked posterior shoulder dislocation associated with subscapularis remplissage.

METHODS

The study comprises a retrospective analysis of consecutive chronic posterior locked shoulders (CPLS) with minimum 2-years follow-up of patients who had undergone McLaughlin technique arthroscopic modification for the treatment of CPLS with a reverse Hill-Sachs lesion. Active range of motion (ROM), Western Ontario (WOSI) and Constant Score (CS), were evaluated pre- and postoperatively. Plain radiographs and magnetic resonance imaging (MRI) scans were collected pre- and post-operatively, recording bone defect, osteoarthritis, cuff integrity/fatty infiltration, and the grade of filling of the reverse Hill-Sachs.

RESULTS

Twelve male patients with a mean follow-up of 37.3 months ± 10.5 (range, 24-58) were included. Mean WOSI and CS scores improved from 41 to 92 and 28 to 94 points, respectively. ROM measurements all had significantly increased at final follow-up, with no significant differences in arm rotation. No defects were left unfilled at final MRI examination.

CONCLUSION

The results of this uncontrolled study with a limited number of patients confirm that arthroscopic reduction and subscapularis remplissage is a highly effective and satisfactory treatment method resulting in no shoulder rotation deficits.

LEVEL OF EVIDENCE

Level IV.

Results and complications of head-preserving techniques in chronic neglected shoulder dislocation: a systematic review

BACKGROUND

Humeral head-preserving procedures may be needed for chronic neglected shoulder dislocation because the presenting age of the patient is often reported to be less than 45 years. The aim of this systematic review was to evaluate the results of the various head-preserving procedures for chronic anterior dislocation (CAD) and chronic posterior dislocation (CPD). This review also aimed to evaluate the results of conservative neglect for CAD.

METHODS

PubMed, Embase, and Cochrane library databases were queried for studies that reported on results of head-preserving procedures for CAD or CPD and for studies that reported on the results of conservative neglect for CAD. Case reports, review articles, acute dislocations, and fracture-dislocations were excluded. The results of the different techniques were pooled for further evaluation.

RESULTS

Seventeen studies were selected for qualitative analysis. These were further subdivided into 9 studies for the CAD group and 11 studies for the CPD group. In the CAD intervention group, 53 shoulders in 7 studies were managed by 5 different head-preserving techniques. The choice of procedure to stabilize the shoulder after open reduction varied between coracoid transfer, capsulolabral repair, remplissage, and Putti-Platt procedure and acromiohumeral K-wire fixation. High resubluxation rates and early arthrosis were reported after open reduction techniques for CAD. In the CAD conservative group, 8 shoulders in 2 studies were managed by conservative methods. In the CPD group, the 2 most common techniques, McLaughlin or modified McLaughlin and bone grafting, were used to treat 74 shoulders in 7 studies and showed good functional outcomes.

CONCLUSION

The choice of open reduction and stabilization technique for CAD was highly variable between the different studies and led to a wide variation in the reported outcomes with a high number of complications such as resubluxation and early arthrosis. The conservative treatment of CAD led to poor functional results. The choice of treatment for CPD was mostly between 2 techniques-McLaughlin and modified McLaughlin reconstruction or the bone graft reconstruction-and they consistently led to good functional outcomes with less complications.

Arthroscopic Reduction of a Chronic Locked Posterior Shoulder Dislocation

Posterior shoulder dislocation is a rare condition. It is easily overlooked and often appears in a chronic locked status, which makes the reduction difficult, even through open procedures. Few reports in the literature have described an isolated arthroscopic reduction because it is difficult to elevate the humeral head to the level of the glenoid surface and obtain anterior-posterior soft-tissue balance. On the basis of an analysis of the mechanisms of the locking of the humeral head and the soft-tissue imbalance, we describe a set of arthroscopic shoulder release and reduction techniques, which include mainly the removal of rotator interval tissue; a thorough subscapularis release from the coracoid, the conjoined tendon, and the glenoid; and a 360° capsule-muscle release from the glenoid and the scapula. The described technique is an effective method to obtain a medial-to-lateral humeral head reduction and anterior-to-posterior soft-tissue balance. The introduction of this technique will provide a practical tool for surgeons to realize an arthroscopic shoulder reduction in the case of a chronic locked posterior shoulder dislocation.

Posterior shoulder instability: a systematic review

INTRODUCTION

This review aims to provide information on outcomes of surgical procedures for soft tissue or bony glenoid and/or humeral abnormalities in case of posterior shoulder instability.

SOURCE OF DATA

A systematic review of the literature according to the PRISMA guidelines was performed. A comprehensive search of PubMed, Medline, CINAHL, Cochrane, Embase, Ovid and Google Scholar databases using various combinations of the keywords 'shoulder', 'posterior instability', 'dislocation', 'reversed bony bankart', 'reversed Hill Sachs', and 'capsulolabral' was performed.

AREAS OF AGREEMENT

A total of 847 shoulders in 810 patients were included. A redislocation event occurred in 33 (8.7%) of 411 shoulders with soft tissue abnormalities and in 12 (9.1%) of 132 shoulders with bony abnormalities of the glenoid, humeral head or both.

AREAS OF CONTROVERSY

The optimal treatment modalities for posterior shoulder dislocation remain to be defined.

GROWING POINTS

Operative stabilization for posterior shoulder instability should be lesion-specific and should correct all components of the posterior instability.

AREAS TIMELY FOR DEVELOPING RESEARCH

Future prospective studies should aim to establish the optimal treatment modalities for posterior shoulder instability.

A Modified Reverse Remplissage Procedure for Management of a Locked Posterior Shoulder Dislocation

Posterior shoulder dislocation is rare and often represents a diagnostic and therapeutic challenge. An impaction fracture of the anteroinferior aspect of the humeral head (called a reverse Hill-Sachs (RHS) fracture) is always present in case of chronic locked posterior dislocation. Surgical management is required and decided on the delay between the trauma and the diagnosis and the importance of the RHS (in percentage). The authors present a chronic locked posterior shoulder dislocation in a 32-year-old active male with a reverse Hill-Sachs lesion of more than 40%. An open reduction was required, and stabilization was achieved with a modified remplissage technique with detachment of the upper quarter of the subscapularis tendon. Three years after the surgery, the patient recovered an excellent functional level with a stable shoulder.

Global Perspectives on Management of Shoulder Instability: Decision Making and Treatment

The glenohumeral joint is prone to instability. Patients with instability should have a physical examination. Imaging studies can provide additional information. Classification schemes that into account soft tissue pathology, neuromuscular control, bone loss, and activity level. An arthroscopic Bankart repair is the mainstay for unidirectional instability. Bone block procedures are indicated for patients with bone loss or a failed attempt at stabilization surgery. The arthroscopic Latarjet is a promising option for these patients. For patients with multidirectional instability, prolonged rehabilitation is indicated, followed by capsular plication or inferior capsular shift if instability is unresponsive to physical therapy.

All-Arthroscopic McLaughlin's Procedure in Patients with Reverse Hill-Sachs Lesion Caused by Locked Posterior Shoulder Dislocation

Purpose  This study aims to investigate the clinical and functional outcomes of the all-arthroscopic McLaughlin procedure in a clinical series of patients suffering by neglected locked posterior shoulder dislocation. Methods  A retrospective clinical study based on prospectively collected data was conducted in a single center regarding 10 patients with neglected locked posterior shoulder dislocation and concomitant reverse Hill-Sachs lesion, who were treated with the all-arthroscopic Mclaughlin procedure. The average humeral bone defect was 39 ± 7% according to the preoperative computed tomography evaluation. The mean time of follow-up was 77 ± 16 months (range, 63-104 months). Results  No patient had suffered a new dislocation, whereas all of them were satisfied with the surgical outcome and returned to their previous activities of daily living. External rotation was restored to every patient studied from 0 degrees at the baseline. At the last follow-up, the median external rotation beside the body was 90 degrees (range, 50-90 degrees; p  < 0.01) and the respective measurement at 90 degrees of abduction was 90 degrees (range, 80-90 degrees; p  < 0.01). The active forward flexion was increased ( p  < 0.01), from 60 degrees (range, 30-180 degrees) at the baseline to 180 degrees (range, 160-180 degrees) at the last follow-up and the internal rotation was gained ( p  < 0.01) from the level of buttock (range, lateral thigh-T12) at the baseline to the T11 level (range, T7-L3) at the last follow-up. The median UCLA score was increased from 8 (range, 4-22) to 35 (range, 33-35; p  < 0.01) and the Oxford instability score from 5 (range, 3-16) to 46 (range, 43-48; p  < 0.01), respectively. Conclusion  The arthroscopic McLaughlin procedure in substantial reverse Hills-Sachs lesion caused by locked posterior dislocation leads to excellent clinical and functional results in the long-term follow-up. Level of Evidence  This is a therapeutic study, case series with no comparison group, Level IV.

Locked posterior fracture-dislocation of the shoulder

BACKGROUND AND AIM OF THE WORK

To describe a valid option for the treatment of locked posterior fracture-dislocation of the shoulder (LPFDS) and to compare it to the literature about this topic.

METHODS

We present a small case series (3 patients), with a medium follow up at 4 years and 5 months. We accurately describe our surgical strategies, underlining the choice of approach, reduction and fixation.

RESULTS

The three patients showed excellent functional and radiological results at the follow up examinations, with a full range of shoulder movements and complete regain of pre-trauma activities. A lateral approach (standard or minimally invasive), a reduction technique with a Shantz pin in the head and in the humeral shaft, and fixation with a locking plate were used in the three patients.

CONCLUSION

LPFDS is a challenging lesion, hard to recognize and to treat. Our suggested method of treatment is highly reproducible and has revealed itself to be very effective in achieving good results.

Posterior Glenohumeral Capsular Reconstruction With Modified McLaughlin for Chronic Locked Posterior Dislocation

Posterior instability is relatively rare when compared with anterior instability but can comprise up to 40% of operatively treated instability cases. Posterior dislocations are much rarer and are classically due to trauma, seizure, or electric shock. Due to a lack of an obvious deformity and an internally rotated and adducted arm position, posterior shoulder dislocations often are missed on initial presentation. In the management of posterior dislocations, considerations need to be made in regard to bony and soft-tissue pathology. In the setting of soft-tissue deficiency, previous options included nonoperative management primarily consisting of bracing and activity modification as well as arthroplasty options that do not rely on the capsulolabral complex for stability. In this paper, we present a technique for treating a chronic posterior shoulder dislocation with an associated large reverse Hill-Sachs deformity. In this setting, a revision labral repair and capsulodesis is generally not possible due to insufficient capsulolabral tissues. Here, we present the technique for an arthroscopic posterior capsule reconstruction using an acellular dermal allograft as well as a McLaughlin procedure for the treatment of a reverse Hill-Sachs lesion.

History of surgical stabilization for posterior shoulder instability

Background

Posterior shoulder instability is common in young athletes. Although the posterior shoulder instability literature is less robust than its anterior counterpart, many surgical procedures have been developed and refined over the past several centuries to address this condition.

Materials and methods

This article represents a retrospective historical analysis of the most common procedures used to treat posterior shoulder instability after sports injuries. A systematic approach to obtain published information on posterior shoulder instability was performed using the PubMed/MEDLINE database, manual searches of high–impact factor journals, and conference proceedings and books.

Results

A wide array of both soft tissue–based and bone-based procedures have been developed for the treatment of posterior shoulder instability, ranging from procedures addressing the soft tissue alone (capsular shift, labral repair, reverse Putti-Platt) or bone-based procedures (glenoid and/or humeral osteotomy, glenoid bone block) to a combination of both bone and soft-tissue procedures (modified McLaughlin procedure).

Discussion

Over the past several centuries, a number of procedures have been developed to address posterior shoulder instability, particularly as this pathology has become better understood. Future work is required not only to continue to advance these procedures but also to assess their outcomes. An understanding of the historical perspective of posterior shoulder instability procedures is essential as surgeons continue to modify these procedures in an effort to best help their patients.

Treatment options for locked posterior shoulder dislocations and clinical outcomes

Posterior dislocations are rare and diagnostically difficult injuries. Diagnosis is often delayed and this leads to a locked posteriorly dislocated humeral head.

Treatment options include conservative methods and surgical anatomic reconstruction options as well as non-anatomic surgical procedures such as subscapularis tendon transfer, hemiarthroplasty and total shoulder arthroplasty.

Decision-making for treatment as well as prognosis depend on the extent of the articular defect size of the humeral head, duration of the dislocation and patient-specific conditions such as age and activity levels.

Cite this article: EFORT Open Rev 2019;4:194-200. DOI: 10.1302/2058-5241.4.180043

Locked posterior dislocation of the shoulder: A systematic review

Locked posterior dislocation of the shoulder is very rare. Seizures and trauma are the most common causes of this injury.There is no current benchmark treatment strategy for these rare cases.This study has shown that reconstruction of the shoulder joint in an anatomical way in acute and chronic cases up to 16 weeks provides good results.The purpose of this study is to evaluate the results of different treatment procedures with outcomes and to compare the results of the same procedures in acute and chronic cases. Cite this article: EFORT Open Rev 2017;3:15-23. DOI: 10.1302/2058-5241.3.160089.

Hippocratic method for reduction of chronic locked anterior shoulder dislocations

PURPOSE

Old shoulder dislocations are usually treated by a variety of surgical approaches. Closed reduction of chronic unreduced dislocation is less widely reported. This study was to evaluate the outcome of reduction of old anterior shoulder dislocations using the Hippocratic method.

METHODS

Between January 2008 and July 2016, patients with unilateral old shoulder dislocations included 10 women and three men with an average age of 60.00 ± 2.83 years. Eight dislocations involved the right shoulder and five the left shoulder. The average delay between dislocation and treatment was 4.46 ± 0.97 weeks (ranging from 3 weeks to 6 weeks). One case also had a greater tuberosity fracture. No patients had distal nerve or artery dysfunction. The patients were all healthy prior to dislocation, i.e., no diabetes, hypertension, or heart disease, etc. Dislocations were diagnosed according to anteroposterior shoulder X‑rays. Shoulder function was assessed using the Constant-Murley score. All manual reductions were conducted under general anesthesia using the Hippocratic method.

RESULTS

All shoulder dislocations were successfully reduced with the Hippocratic method. The mean time of closed reduction was 31.46 ± 7.60 min and the mean hospitalization time was 2.77 ± 1.09 days. No neurovascular injury or humerus fractures were noted during hospitalization. The Constant-Murley scores before reduction and after reduction were 34.31 ± 7.25 and 60.92 ± 8.95, respectively. These scores were significantly higher after reduction compared with before reduction (P < 0.01). No recurrent dislocation was observed in any patients during the follow-up period.

CONCLUSION

The closed reduction of old anterior shoulder dislocations using the Hippocratic method is not unfeasible and should be attempted in selected patients.

Step-by-Step Technique for Segmental Reconstruction of Reverse Hill-Sachs Lesions Using Homologous Osteochondral Allograft

Posterior shoulder dislocations are accompanied by high forces and can result in an anteromedial humeral head impression fracture called a reverse Hill-Sachs lesion. This reverse Hill-Sachs lesion can result in serious complications including posttraumatic osteoarthritis, posterior dislocations, osteonecrosis, persistent joint stiffness, and loss of shoulder function. Treatment is challenging and depends on the amount of bone loss. Several techniques have been reported to describe the surgical treatment of lesions larger than 20%. However, there is still limited evidence with regard to the optimal procedure. Favorable results have been reported by performing segmental reconstruction of the reverse Hill-Sachs lesion with bone allograft. Although the procedure of segmental reconstruction has been used in several studies, its technique has not yet been well described in detail. In this report we propose a step-by-step description of the technique how to perform a segmental reconstruction of a reverse Hill-Sachs defect.