Table 1 Measurement errors of model-based RSA of the metacarpal and Trapezium component of the SR™TMC prosthesis after repeated measurements of five cadaveric hands in ten different positions. X,Y,Z: translations along the x-axis (medial-lateral), y-axis (distal-proximal) and z-axis (posterior-anterior). Rx,Ry,Rz: rotations around the x-axis (flexion-extension), y-axis (internal-external) and z-axis (abduction-adduction)
Metacarpal Component | X (mm) | Y (mm) | Z (mm) | Rx (°) | Ry (°) | Rz (°) |
Average | 0,006 | -0,003 | 0,055 | -0,034 | 0,502 | 0,043 |
SD | 0,098 | 0,181 | 0,133 | 1,759 | 1,617 | 1,069 |
Min | -0,156 | -0,272 | -0,150 | -3,495 | -1,699 | -2,242 |
Max | 0,152 | 0,319 | 0,225 | 2,958 | 3,295 | 0,830 |
Trapezium Component | X (mm) | Y (mm) | Z (mm) | Rx (°) | Ry (°) | Rz (°) |
Average | 0,025 | 0,003 | -0,034 | -0,148 | -0,045 | -0,474 |
SD | 0,093 | 0,057 | 0,082 | 0,749 | 0,762 | 1,085 |
Min | -0,057 | -0,077 | -0,117 | -1,272 | -0,703 | -2,666 |
Max | 0,253 | 0,104 | 0,142 | 1,157 | 1,830 | 1,045 |