Early Results of Mini-incision vs Conventional Total Knee Arthroplasties

PURPOSE: To compare the radiographic and early clinical results of mini-incision total knee arthroplasty(TKA) with those of conventional TKA. MATERIALS AND METHODS: A prospective study was made for 40 primary TKAs(20 mini-incision TKAs; group I and 20 conventional TKAs; group II) done by one surgeon between Dec. 2005 and Feb. 2006, followed up more than 1 year. There were no significant differences between the two groups in all the preoperative evaluations, including age, sex, body mass index, range of knee motion, knee society score(KSS) and radiographic alignments. Postoperative evaluations included length of skin incision, operative time, blood loss, immediate postoperative course, range of knee motion, KSS and radiographic results. RESULTS: Except for the shorter skin incision in mini-incision TKAs(group I), no significant difference was noted between the two groups in all the postoperative evaluations. There were no significant complications in both groups. CONCLUSION: Mini-incision TKA had the advantage of a shorter skin incision and could give us the similar early clinical and radiographic results as conventional TKA.

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

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) type:34, posterior cruciate substituting (PS) type:62] 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.