Primary repair of extensor pollicis longus rupture after volar locking plating for distal radial fracture

We presumed that primary repair would be possible if the extensor pollicis longus (EPL) rupture after volar locking plating (VLP) for distal radius fracture (DRF) was diagnosed earlier. Thus, five cases of EPL ruptures were resolved via primary repair rather than extensor indicis proprius (EIP) transfer, so we reported the clinical outcomes of at least 2 years follow-up since EPL repair. Of 588 consecutive patients with the fractures treated between January 2016 and December 2019, 501 who met out inclusion/exclusion criteria were initially investigated. We informed patients of: (1) the ordinary range of motion of thumb at full wrist flexion/extension; (2) the proper tone of thumb extension compared to the contralateral thumb; and (3) the degree of pain/discomfort during thumb exercise. After discharge, we called each patient monthly commencing at 8 weeks postoperatively to enquire if any of those had worsened, by telephone. Five patients had ruptured EPLs diagnosed at a mean of postoperative-12.8 weeks. Three came to outpatient department for suspected tendon rupture just after telephone survey with the authors. The other two visited after detecting insufficiency in the three items, during the period between telephone inquiries. In four, the torn EPL were encapsulated by tendon sheathes. Extension lag at interphalangeal joint was absent and other clinical outcomes associated with DRF were all satisfactory at final follow-up. Primary repair of EPL rupture (rather than EIP transfer) is possible if patients are properly followed up after VLP for DRF. LEVEL OF EVIDENCE: Level IV, retrospective case series.