Abstract
BackgroundThe purpose of this study was to determine the feasibility of Roentgen Stereophotogrammetric Analysis (RSA) in total joint arthroplasty of the trapeziometacarpal (TMC) joint of the thumb.MethodsIn five cadaveric hands the TMC-joint was replaced by the Surface Replacement Trapeziometacarpal prosthesis (SR™ TMC prosthesis; Avanta, San Diego, CA) and tantalum beads of 0.8 mm were implanted for RSA. RSA radiographs in two directions were made in ten positions to calculate the measurement error. Migration values from zero are indicative for the measurement error. The number of detected markers was recorded.ResultsThe accuracy analysis showed that for the translations the mean measurement error varied between 0.003 mm (SD 0.057) and 0.055 mm (SD 0.133). For the rotations values ranged from 0.034° (SD 1.759) to 0.502° (SD 1.617).ConclusionsRSA analysis of the SR™ TMC prosthesis is feasible. The measurement error is good for the translations but high for the rotations. The latter is due to the close position of the markers relative to each other. Level of evidence III.
Highlights
The purpose of this study was to determine the feasibility of Roentgen Stereophotogrammetric Analysis (RSA) in total joint arthroplasty of the trapeziometacarpal (TMC) joint of the thumb
For the metacarpal bone, all beads were visible in all positions and both RSA radiographs
For the polyethylene metacarpal prosthesis component one of the five specimen had an over projection of the proximal bead by the metal trapezium prosthesis component
Summary
The purpose of this study was to determine the feasibility of Roentgen Stereophotogrammetric Analysis (RSA) in total joint arthroplasty of the trapeziometacarpal (TMC) joint of the thumb. Osteoarthritis of the trapeziometacarpal joint (TMC joint) is a disabling disease. The prevalence of trapeziometacarpal osteoarthritis (OA) is estimated to be 2.2 % in women and 0.62 % in men. A high prevalence is found in older women (70–74 years) with an estimate of 5.3 % [1]. Several prosthesis designs for TMC joint replacement have been used with variable success rates, early failure remains an important issue [4, 5]. These failures are mainly due to aseptic loosening caused by implant
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