Total Knee Arthroplasty with NexGen(R) System: 3-8 Year Follow-up Results / 대한정형외과학회잡지

ABSTRACT

PURPOSE: To evaluate the 3 to 8 year follow-up clinical and radiological results after NexGen(R) total knee arthroplasty (TKA). MATERIALS AND METHODS: Ninety-six knees in 75 patients, who could be followed up more than 3 years after NexGen(R) TKA [cruciate retaining (CR) type34, posterior cruciate substituting (PS) type62] from March 1997 to May 2002, were evaluated retrospectively. The evaluations included the preoperative and postoperative range of motion (ROM), Knee Society Score (KSS), knee functional score, tibiofemoral angle and postoperative complications. RESULTS: The ROM increased from preoperative mean flexion contracture of 9.3 degrees and further flexion of 116.4 degrees to a postoperative mean flexion contracture of 2.1 degrees and further flexion of 126.3 degrees (ROM 124.2 degrees). The ROM of CR type improved from 112.7 degrees to 123.1 degrees, and the PS type improved from 105.3 degrees to 124.9 degrees (p>0.05). The KSS and knee function score improved from 54 and 41 before surgery to 94 and 87 after surgery, respectively (p>0.05). The tibiofemoral angle changed from preoperative varus 5.7 degrees to postoperative valgus 5.2 degrees. The complications were two cases of infection and two cases of early loosening. CONCLUSION: The 3 to 8 year follow-up results after NexGen(R) TKA were satisfactory in both the CR and PS types. However, a longer term follow-up evaluation will be necessary.