Knee Surg Relat Res.  2018 Mar;30(1):28-33. 10.5792/ksrr.17.025.

Long-Term Clinical Results of Unicompartmental Knee Arthroplasty in Patients Younger than 60 Years of Age: Minimum 10-Year Follow-up

• Kim KT
• Lee S
• Lee JS
• Kang MS
• Koo KH

• KMID: 2407507
• DOI: http://doi.org/10.5792/ksrr.17.025

Abstract

PURPOSE
To evaluate the long-term clinical results and survivorship of unicompartmental knee arthroplasty (UKA) in patients younger than 60 years of age.
MATERIALS AND METHODS
One hundred and six cases of medial UKA with a minimum follow-up of 10 years were selected for this study. There were 80 patients and the preoperative diagnosis was osteoarthritis in all cases. The mean age of the patients was 54.2 years and the mean duration of follow-up was 12.1 years. Clinical assessments were performed using the Knee Society clinical rating system, and a survival analysis was performed using the Kaplan-Meier method.
RESULTS
The mean knee and function scores improved from 52.8±8.4 points and 56.6±10.6 points preoperatively to 85.4±9.1 points and 84.7±10.4 points at the last follow-up, respectively (p < 0.001). The mean range of motion was recovered from 130.7° to 132.8° at the last follow-up. Complications occurred in 20 cases (16.7%) and the most prevalent complication was mobile bearing dislocation (n=9, 7.5%). The 10-year survival rate was 92.8% when conversion to total knee arthroplasty was defined as failure, whereas 89.3% when failure was defined as all revision surgeries.
CONCLUSIONS
The long-term clinical results of UKA were satisfactory in patients under 60 years of age. Therefore, UKA could be a useful method for the treatment of medial compartment osteoarthritis of the knee in patients younger than 60 years of age.

Keyword

Knee; Osteoarthritis; Arthroplasty; Unicompartmental; Survivorship; Younger patient

MeSH Terms

Arthroplasty
Arthroplasty, Replacement, Knee*
Diagnosis
Dislocations
Follow-Up Studies*
Humans
Knee
Methods
Osteoarthritis
Range of Motion, Articular
Survival Rate