Biomechanic Analysis of Trapeziectomy, Ligament Reconstruction With Tendon Interposition, and Tie-In Trapezium Implant Arthroplasty for Thumb Carpometacarpal Arthritis: A Cadaver Study

We found several biomechanic advantages to the implant compared with LRTI. Advantages include reduction in axial and radial displacement and maintenance of the trapezial space. We attribute these advantages to the effect of the implant as a spacer. The significant rotation with the implant, however, raises questions concerning implant design and fixation. We found no biomechanic advantage to LRTI or ligament reconstruction without tendon interposition over trapeziectomy alone.