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. 2012 Dec;24(4):214-20.
doi: 10.5792/ksrr.2012.24.4.214. Epub 2012 Nov 29.

Outcomes of the different types of total knee arthroplasty with the identical femoral geometry

Sang Min Lee  1 , Sang Cheol Seong, Sahnghoon Lee, Won Chul Choi, Myung Chul Lee
Affiliations

Outcomes of the different types of total knee arthroplasty with the identical femoral geometry

Sang Min Lee et al. Knee Surg Relat Res. 2012 Dec.

Abstract

Purpose: There are controversies around the role of the posterior cruciate ligament and the effect of design modifications for high flexion in total knee arthroplasty (TKA). So, we compared the clinical outcomes of the cruciate retaining (CR), posterior stabilized (PS), and high flexion posterior stabilized (F-PS) designs in TKA with identical femoral geometry.

Materials and methods: One hundred seventy nine knees with 3 different types of prostheses after a minimum 5-year follow-up were enrolled in this retrospective study: 45 with CR, 40 with PS and 94 with F-PS. The mean ages of these groups were 65.7, 67.2, and 67.5, and the mean durations of follow-up were 8.1, 8.0, and 6.8 years, respectively. We compared the range of motion, functional outcomes, and radiographic measurements at the 2-year follow-up and last follow-up.

Results: The maximal flexion angle was significantly lower in the CR group than the F-PS group at the 2-year follow-up. However, there was no significant difference at the last follow-up. Functional outcomes and survival rate of the three groups were similar at the last follow-up.

Conclusions: Three different types of TKAs (CR, PS and F-PS) with identical femoral geometry showed similar mid-term outcomes with regard to the range of motion, functional outcomes and survival rate.

Keywords: High-flex implant; Knee; Posterior cruciate-retaining; Posterior cruciate-substituting; Total knee arthroplasty.

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Figures

Fig. 1
Fig. 1
Anterior/posterior and lateral radiographs of the knees with (A) cruciate retaining, (B) posterior stabilized and (C) high flexion posterior stabilized prostheses.
Fig. 2
Fig. 2
Kaplan-Meier survivorship estimates, using revision surgery for any reason as an endpoint, showed a 96.1% survival rate at 7 years. The survival curves of the cruciate retaining, posterior stabilized, and high flexion posterior stabilized groups were similar. TKA, total knee arthroplasty.
See this image and copyright information in PMC

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