Goodness-of-fit determination of femoral knee prosthesis using computer segmentation.

35 patients undergoing Total Knee Arthroplasty (TKA) were examined with Computerized Tomography (CT). 3D computer models were created through segmentation of the CT scan data with Materialize MIMICS. Morphological dimensions of ten selected parameters were measured and then compared to two commercial femoral prosthesis design ranges. All measuring techniques were validated and the reproducibility of measuring morphological dimensions with points and planes from landmarks were investigated. The chi2 test was used as a goodness-of-fit parameter to determine which femoral component would achieve the best geometric fit for a specific patient. After establishing a database of geometric values, the method can be used to calculate the dimensions of a customized femoral knee prosthesis to achieve a perfect geometric fit for a TKA patient.