Synthesis of evidence for the treatment of intersection syndrome

Examining the Forearm Intersection through Palpation and Ultrasonography

BACKGROUND

Forearm intersection syndrome causes pain, swelling, and a rub at the dorsal distal forearm where the first extensor compartment muscles intersect with the second compartment tendons. Although primary care settings tend to treat mild cases, high-performance athletes may suffer from severe symptoms that require surgery. This proof-of-concept study aims to help detect the anatomical substrate of forearm intersection syndrome using palpation and ultrasonography when available.

METHODS

Five individuals were studied using independent palpation and ultrasonography to identify the first dorsal compartment muscles and the second dorsal compartment tendons. The distances between the dorsal (Lister's) tubercle of the radius and the ulnar and radial edges of the first dorsal compartment muscles were measured to determine the location and extent of the muscle-tendon intersection. The palpatory and ultrasonographic measurements were compared using descriptive statistics and the paired t-test.

RESULTS

The mean distances from the dorsal tubercle of the radius to the ulnar and radial borders of the first dorsal compartment muscles were 4.0 cm (SE 0.42) and 7.7 cm (SE 0.56), respectively, based on palpation. By ultrasonography, the corresponding distances were 3.5 cm (SD 1.05, SE 0.47) and 7.0 cm (SD 1.41, SE 0.63). Both methods showed a similar overlap length. However, ultrasonography revealed a shorter distance between the dorsal tubercle of the radius and the ulnar border of the first compartment than palpation (p = 0.0249).

CONCLUSIONS

Our findings indicate that a basic knowledge of anatomy should help health professionals diagnose forearm intersection syndrome through palpation and, if available, ultrasonography.

Distal Intersection Syndrome Between Second and Third Dorsal Compartments of the Wrist

Distal intersection syndrome (DIS) is a rare form of tenosynovitis affecting the second and third dorsal extensor compartments of the wrist, which is rarer and more distal than the classically described intersection syndrome between the first and second compartments. In this report, we present three cases of DIS, their inciting activities, and ensuing treatment courses. Diagnosis of DIS was confirmed via MRI in all cases. Treatment modalities consisted of non-steroidal anti-inflammatory medications and varying durations of immobilization in all three patients, initially. One patient ultimately underwent surgical debridement and partial tenosynovectomy. At the end of follow-up, all patients saw a reduction in symptomatology with a return to baseline activity levels. This case report provides an overview of the possible clinical courses of DIS, as well as treatment strategies that can be implemented. Providers must maintain a high index of suspicion for this condition and treat patients with a great deal of caution, as extensor tendon rupture is possible.

CMC Mimickers: Differential Diagnosis and Work-Up for Radial-Sided Wrist Pain

In patients with radial-sided wrist pain, a myriad of possible etiologies exists and as such, a detailed history, examination, and, where indicated, imaging is obtained to try and aid with its diagnosis. The purpose of this article is to provide an overview of radial-sided wrist pain, diagnostic modalities and discuss current treatment options. More detailed information is out-of-scope for this article and if needed, we would guide the reader to seek out other selected texts, as indicated.

Overview of Sport-Specific Injuries

Athletes are at risk for a variety of injuries not typically sustained in everyday life. The team physician must be capable of not only identifying and treating injuries as they occur, but he or she must be armed with the knowledge to minimize the risk of injuries before they occur. This review serves to provide an overview of the various sport-specific injuries typically encountered by team physicians. Injuries are grouped by body part and/or organ system, when possible. We do not aim to cover in detail the various treatments for these injuries; rather, we hope that this article provides a comprehensive overview of sport-specific injury, and demonstrate the well-roundedness in skills that must be possessed by team physicians.

Management of intersection syndrome in professional motorcycle rider: a case report

Background and aim of the work: Intersection syndrome is an uncommon and underdiagnosed condition, especially found in sport overuse. This case report describes the treatment of a professional motor biker who presented intense wrist pain and swelling after training sessions. Methods: The athlete was treated with rest, the use of a wrist splint combined with NSAIDs, physical therapy, including pulsed Nd-YAG laser therapy and exercise, such as stretching and release, massage and eccentric training. Results: The applied therapeutic protocol was successful and allowed the biker to completely resolve the symptoms and return to training session and professional races at full power. The results are durable at 5 months post injury follow up. Conclusions: This experience suggests that pulsed Nd-YAG laser therapy can be an additional useful tool in the global approach treatment for intersection syndrome, contributing with splint and manual therapy, to full recovery even in mechanically stressful conditions. (www.actabiomedica.it)

Evaluation of the pressure on the dorsal surface of the distal radius using a cadaveric and computational model: clinical considerations in intersection syndrome and Colles' fracture

The fibers of the abductor pollicis longus (APL) and extensor pollicis brevis (EPB) muscles intersect the distal radius. This anatomical structure puts pressure on the dorsal surface of the distal radius when various wrist positions are adopted. An increase in this pressure is associated with the risk of intersection syndrome and with immobilization after Colles' fracture. However, the relationship between the pressure on the distal radius and various wrist positions remains unclear. This study was established to provide quantitative data on the mechanical effect of the pressure exerted by the APL and EPB. Ten cadaveric wrist models containing a force sensor were prepared and used to record pressure levels at various wrist positions, such as pronation, supination, flexion and dorsiflexion, and radial and ulnar deviation. A three-dimensional simulation model comprising four bones, one muscle, one tendon, and one tendon sheath was constructed and analyzed in detail using the finite element method. The contribution of the APL and EPB to the pressure exerted on the distal radius was quantified by dissecting muscles while measuring pressure. The position (pronation and ulnar deviation without flexion/dorsiflexion) associated with a strong force being exerted on the distal radius was determined by measuring and analyzing the mechanical effect. We concluded that this position increases the risk of intersection syndrome but provides effective immobilization after Colles' fracture. The cadaveric and computational method presented herein is the first to identify the anatomical relationship between the pressure on the distal radius and various wrist positions.