The Outcomes of Extensor Tendon Repair Based on Timing of Repair.

Background: Little is known regarding the effect timing of repair has on extensor tendon repair results. The purpose of this study is to determine if a relationship exists between the time of extensor tendon injury to extensor tendon repair and patient outcomes. Methods: A retrospective chart review was conducted on all patients that underwent extensor tendon repair at our institution. The minimum time to final follow-up was 8 weeks. Patients were then divided into two cohorts for analysis; those that underwent repair less than 14 days after injury and those that underwent extensor tendon repair at or greater than 14 days after injury. These cohorts were further sub-grouped by zone of injury. Data analysis was then completed using a two-sample t -test assuming unequal variance and ANOVA for categorical data. Results: A total of 137 digits were included in final data analysis, with 110 digits repaired less than 14 days from injury and 27 digits in the greater than or equal to 14 days to surgery group. For zones 1-4 injuries, 38 digits were repaired in the acute surgery group and eight digits in the delayed surgery group. There was no significant difference in final total active motion (TAM) (142.3° vs. 137.4°). Final extension was also similar between the groups (2.37° vs. 2.13°). For zones 5-8 injuries, 73 digits were repaired acutely, and 13 digits were repaired in delayed fashion. There was no significant difference in final TAM (199.4° vs. 172.7°). Final extension was also similar between the groups (6.82° vs. 5.77°). Conclusions: We found time from extensor tendon injury to surgical repair did not affect final range of motion when comparing acute repair within 2 weeks from injury or delayed repair greater than 14 days from injury. Additionally, there was no difference in secondary outcomes, such as return to activity or surgical complications. Level of Evidence: Level IV (Therapeutic).