J Korean Orthop Assoc.  2008 Aug;43(4):451-457. 10.4055/jkoa.2008.43.4.451.

Unicompartmental versus Total Knee Arthroplasty in the Same Patient

• Kim KT
• Lee S
• Park HS
• Cho KH
• Kim KS

• KMID: 1480405
• DOI: http://doi.org/10.4055/jkoa.2008.43.4.451

Abstract

PURPOSE: To compare the clinical and radiographic results of unicompartmental knee arthroplasty (UKA) and total knee arthroplasty (TKA) in the same patient, and to investigate patient preference and satisfaction.
MATERIALS AND METHODS
Among the 56 patients who underwent a UKA in one knee and a TKA in the opposite knee between January 2002 and December 2004, 51 patients were followed up. The average follow-up period was 4 years.
RESULTS
The average Knee Society Score (KSS) improved from 53.5 preoperatively to 90.7 at last follow-up in the UKA knee, and from 50.4 to 89.8 in the TKA knee. The mean range of knee motion also improved from 124.7degrees to 133.2degrees in the UKA knee, and from 122.5degrees to 127.1degrees in the TKA knee. The tibiofemoral angle changed from 0.3degrees of varus to 5.6degrees of valgus in the UKA knee, and from 2.4degrees of varus to 5.8degrees of valgus in the TKA knee. For patient preference, 23 patients (45%) preferred the UKA knee and 19 patients (37%) preferred the TKA knee. Most patients (42 patients, 82%) reported being nvery satisfied' or nsatisfied' with both knees.
CONCLUSION
The clinical and radiographic results of both the UKA and the TKA in the same patient were satisfactory at the 4-year follow-up. The UKA knee had a slightly better range of knee motion, but there was essentially no difference between the UKA knee and the TKA knee.

Keyword

Knee joint; Osteoarthritis; Unicompartmental knee arthroplasty; Total knee arthroplasty

MeSH Terms

Arthroplasty
Follow-Up Studies
Humans
Knee
Knee Joint
Osteoarthritis
Patient Preference

Figure

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  Fig. 1 (A, B) The preoperative radiographs of a 71-year-old woman show osteoarthritis of both knees. (C, D) The postoperative radiographs taken after unicompartmental knee arthroplasty (Rt. knee) and total knee arthroplasty (Lt. knee) show findings at the 4-year follow-up.

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