Anthropomorphic mismatch between distal femurs and a standard total knee replacement system in Pakistani population

To compare the measurements of distal femurs of a Pakistani population and with the implants used. The single-centre prospective cross-sectional study was conducted at the Indus Hospital, Karachi, from 01-06-2011 to 31-10-2011, and comprised total knee replacement patients. Surgeries were performed by the same team. Each measurement was taken after the resection of the trochlea (flush to the anterior femoral cortex), the distal cut and the anterior chamfer cuts. Measurements were taken intraoperatively with a sterile vernier calliper. SPSS 17was used to analyse the data. The mean age of the 33 patients in the study was 59.3±7years. There were 4(12.1%) males and 29(87.9%) females. A mismatch was found in per-operative measurements with the mean aspect ratio being 0.79±0.05and the standardised aspect ratio of the implants being 0.90 (SD±0.0). There are differences between anthropomorphometry of our skeleton and Caucasian designed implants. This could have implications in the long term.