Minimally Invasive Quadriceps Sparing Total Knee Arthroplasty

ABSTRACT

PURPOSES: To compare the radiologic results in the minimally invasive quadriceps sparing total knee arthroplasty(MIS-QS TKA) with those in conventional total knee arthroplasty(TKA). MATERIALS AND METHODS: Between June 2004 and December 2004, we underwent 20 MIS-QS TKAs (group I) and 20 conventional TKAs(group II). All cases were female with osteoarthritis. The average age was 68.0 years in group I and 65.0 years in group II. The mechanical axis and the implant position were measured by 2 observers according to the reontgenographic evaluation system of the American Knee Society. RESULTS: The mean length of skin incision was 9.2 cm in group I and 16.1 cm in group II. The mean operative time was 127 minutes in group I and 85 minutes in group II. The mean postoperative mechanical axis was varus 1.35 degrees in group I and varus 0.37 degrees in group II. And the mean alpha, beta, gamma and delta angle were 94.9, 90.6, 4.5 and 85.5 degrees in group I, and 94.3, 91.4, 4.7 and 84.6 degrees in group II, respectively. There was no significant difference in the radiologic results between both groups. CONCLUSIONS: There was no significant difference in the implant position and mechanical axis between MIS-QS TKA group and conventional TKA group. Average skin incision was shorter in MIS-QS TKA, but longer operation time taken compared to that of conventional TKA.