Patient-Reported Outcomes Improve after Hypothenar Fat Flap for the Treatment of Recurrent Carpal Tunnel Syndrome

Background: Recalcitrant carpal tunnel syndrome (CTS) can present with persistent or recurrent symptoms after carpal tunnel release (CTR). A common aetiology for recurrent CTS is the development of perineural adhesions due to excess scarring. The hypothenar fat pad flap (HFPF) has been described to decrease the amount of scarring formed after revision CTR. Herein, we present a prospective evaluation of these patients. Methods: A prospective series of consecutive patients by a single surgeon with recurrent CTS was conducted. All patients had at least 3 months follow-up. Patients received a revision open CTR with HFPF. The primary outcome was the Boston Carpal Tunnel Questionnaire (BCTQ). Secondary outcomes included pain and satisfaction on visual analogue scale, range of motion, grip strength, patient-reported outcomes and complications. Clinical outcomes were compared between preoperative and postoperative intervals using paired t-tests, with significance defined as p < 0.05. Results: Fifteen wrists (14 patients) were recruited for the study. Patients were predominantly male (n = 9; 66%). Revision open CTR with HFPF was performed a median of 42 months (range: 4-300 months) post primary CTR. Patients demonstrated improved patient-reported outcomes with significantly improved BCTQ pain score (p < 0.01), Patient-Rated Wrist and Hand Evaluation (p < 0.01) and QuickDASH (p < 0.001). Two patients in the series reported postoperative complications; however, there was no incidence of donor site morbidity recorded. Conclusions: Revision open CTR with hypothenar fat pad flap is associated with decreased pain, high patient satisfaction and improved functional measures compared to pre-operative status. Level of Evidence: Level IV (Therapeutic).