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. 2014 Sep;26(3):135-40.
doi: 10.5792/ksrr.2014.26.3.135. Epub 2014 Aug 29.

Total Knee Arthroplasty Using a Posterior Cruciate Ligament Sacrificing Medial Pivot Knee: Minimum 5-year Follow-up Results

Yoon-Seok Youm  1 , Sung-Do Cho  1 , Seon-Ho Lee  1 , Hye-Yong Cho  1
Affiliations

Total Knee Arthroplasty Using a Posterior Cruciate Ligament Sacrificing Medial Pivot Knee: Minimum 5-year Follow-up Results

Yoon-Seok Youm et al. Knee Surg Relat Res. 2014 Sep.

Abstract

Purpose: To evaluate minimum 5-year follow-up clinical and radiological results of total knee arthroplasty (TKA) using a posterior cruciate ligament sacrificing (PS), non-substituting Advance Medial Pivot Knee.

Materials and methods: One hundred and twenty knees in 80 patients who could be followed up for more than 5 years after TKA using the PS Advance Medial Pivot Knee were evaluated retrospectively. The evaluations included the preoperative and postoperative range of motion (ROM), tibiofemoral angle, Knee Society (KS) knee and function scores, and Western Ontario and McMaster Universities Arthritis Index (WOMAC) score. The Kaplan-Meier method was used for survival analysis.

Results: The ROM increased from a preoperative mean flexion contracture of 7.6° and further flexion of 115.1° to a postoperative mean flexion contracture of 1.5° and further flexion of 120.5°. The tibiofemoral angle was changed from 4.6° varus preoperatively to 5.8° valgus postoperatively. The KS knee and function scores as well as WOMAC score significantly improved after surgery (p<0.05). Complications developed in 4 cases (3.3%): 2 cases of periprosthetic patellar fracture (1.7%) and 2 cases of aseptic loosening (1.7%). The seven-year survival rate was 98.1% in the Kaplan-Meier survival analysis.

Conclusions: The minimum 5-year follow-up results of TKA using the PS Medial Pivot Knee were satisfactory.

Keywords: Arthroplasty; Knee; Medial Pivot.

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Conflict of interest statement

No potential conflict of interest relevant to this article was reported.

Figures

Fig. 1
Fig. 1
(A) Early failure of the tibial component was observed intraoperatively. (B) The tibial component was removed. (C) Revision total knee arthroplasty was performed using a stemmed tibial component and a structural allograft.
Fig. 2
Fig. 2
(A) Anteroposterior (AP) and lateral radiographs were taken immediately postoperatively. (B) AP and lateral radiographs taken at postoperative 67 months show aseptic loosening of the tibial component and osteolysis of the femoral component.
Fig. 3
Fig. 3
Kaplan-Meier survival curve of the Medial Pivot Knee prosthesis.
See this image and copyright information in PMC

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