Proximal Trapezoidectomy and Scaphotrapezoid Joint Tendon Interposition at the Time of Ligament Reconstruction and Tendon Interposition for Pan Trapezial Osteoarthritis Does Not Increase Proximal Carpal Row Malalignment.

Background  Surgical options for osteoarthritis (OA) of the first carpometacarpal include excision, replacement arthroplasty, and arthrodesis. However, in pan trapezial OA, optimal management of residual scaphotrapezoidal articulation has remained unclear. Purpose  The purpose of this study was to evaluate whether removing the proximal trapezoid from the scaphotrapezoid joint (STJ) and interposing tendon when performing a ligament reconstruction and tendon interposition (LRTI) for pan trapezial arthritis resulted in any clinical or radiographic compromise compared with LRTI alone in isolated carpometacarpal joint arthritis. Methods  In a prospective consecutive cohort, 122 thumbs were selected to generate two matched cohorts and a cross-sectional review was completed at an average of 24 months (range: 5-203 months). Fifty-six thumbs had LRTI alone and 66 thumbs also had resection of the proximal portion of the trapezoid with tendon interposition in the residual gap. Results  The cohorts showed no significant differences in subjective and objective outcome measures and imaging. Excision of the STJ was not associated with poorer clinical outcomes or the development of a dorsal intercalated segment instability deformity. Conclusions  The management of pan trapezial arthritis with LRTI and proximal trapezoid excision and STJ interposition appears satisfactory on short- to medium-term clinical and radiographic follow-up. Level of Evidence:  This is a Level III, consecutive cross-sectional cohort study.