LAUSR

BACKGROUND Extensor pollicis longus (EPL) rupture and tenosynovitis of the third dorsal compartment is often described in association with a history of rheumatoid arthritis or in the setting of a distal radius fracture. However, the literature suggests multiple other potential factors that may lead to a seemingly spontaneous rupture. METHODS We performed a systematic review following guidelines set forth by the Preferred Reporting Items for Systematic Reviews and Meta-Analyses statement. The search consisted of headings and keywords related to tendon injuries, tendinopathy, hand surgery, tendon transfer, and injections, as published in reports and studies. Citations were screened by title and abstract against predetermined inclusion and exclusion criteria by 2 independent reviewers, with a third reviewer resolving discrepancies. To be eligible, articles had to meet the following inclusion criterion: describe cases of spontaneous EPL rupture or tenosynovitis of the third dorsal compartment. The exclusion criterion was any history of distal radius fracture or rheumatoid arthritis. RESULTS We identified 29 articles that met the inclusion criterion. CONCLUSIONS A myriad of prodromal events or predisposing factors ultimately led to EPL rupture or tenosynovitis of the third compartment. Methods of reconstruction described included primary repair, tendon grafting, and tendon transfer techniques; all with generally good outcomes. These results highlight the inherent fragility of this tendon and support the historical recommendation for early release of the EPL tendon in the setting of tenosynovitis of the third dorsal compartment.