J Korean Orthop Assoc.  2009 Apr;44(2):192-200.

Comparative Study for the Results of Unicompartmental Knee Arthroplasty in Patients Younger and Older than 60 Years of Age

Affiliations
  • 1Department of Orthopedic Surgery, Seoul Sacred Heart General Hospital, Seoul, Korea. kktkimos@hanmail.net

Abstract

PURPOSE
We wanted to assess the relations between age and the outcome of unicompartmental knee arthroplasty (UKA) based on a comparative study of UKA patients younger than 60 years and UKA patients older than 60 years of age. MATERIALS AND METHODS: Among the patients who underwent a UKA between January 2002 and June 2003, 230 cases (the group of patients with ages under sixty consisted of 89 knees - group I, and the group of patients with ages over sixty consisted of 141 knees - group II) were followed up for at least 5 years after the operation. Clinical assessments were made using the Knee Society Score (KSS) rating system. RESULTS: The average KSS knee and function scores improved from 54.2 and 57.1 preoperatively to 87.3 and 85.2 at the last follow-up in group I, and from 54.7 and 54.3 to 89.5 and 81.7 in group II, respectively. The mean range of knee motion also improved from 129.4degrees to 132.9degrees in group I and from 126.8degrees to 133.2degrees in group II, respectively. There were 5 cases of failed UKAs in each group, and the survival rate of the implant at 5 years was 94.7% in group I and 96.6% in group II. CONCLUSION: The clinical results of UKA were satisfactory in both age groups. Group I had better results on the knee function score at the last follow-up, but there was no significant difference between both age groups. UKA can be a one of the reliable methods for the treatment of osteoarthritis in patients younger than 60 years of age.

Keyword

Knee joint; Osteoarthritis; Unicompartmental arthroplasty; Age

MeSH Terms

Arthroplasty
Follow-Up Studies
Humans
Knee
Knee Joint
Osteoarthritis
Survival Rate

Figure

  • Fig. 1 Preoperative radiographs of a 52-year-old woman show medial osteoarthritis of right knee (A). Postoperative radiographs taken 6 years after unicompartmental knee arthroplasty show good alignment and no loosening (B).

  • Fig. 2 The three areas of the tibial component evaluated to determine the extent of radiolucency.

  • Fig. 3 Kaplan-Meier survivorship analysis curve.


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