Clin Orthop Surg.  2016 Dec;8(4):386-392. 10.4055/cios.2016.8.4.386.

Clinical Results of Lateral Unicompartmental Knee Arthroplasty: Minimum 2-Year Follow-up

• Kim KT
• Lee S
• Kim J
• Kim JW
• Kang MS

• KMID: 2412320
• DOI: http://doi.org/10.4055/cios.2016.8.4.386

Abstract

BACKGROUND
We investigated the clinical results and early complications after lateral unicompartmental knee arthroplasty (UKA) using the Zimmer unicompartmental high-flex knee (ZUK) prosthesis with a minimum follow-up of 2 years.
METHODS
Twenty-seven patients (30 cases) who underwent lateral UKA with the ZUK prosthesis between January 2011 and February 2014 were selected for this study. The mean age of the patients was 63.3 years at the time of surgery, and the mean follow-up was 3 years and 2 months (range, 24 to 48 months). A retrospective investigation method was used to evaluate the clinical and radiographic results with use of the Knee Society (KS) clinical rating system and plain radiography.
RESULTS
The mean KS pain score was improved from 17.9 points (range, 10 to 30 points) preoperatively to 40.5 points (range, 30 to 45 points) at the final follow-up (p < 0.001). The mean KS knee score and function score significantly increased from 63.2 points (range, 48 to 70 points) and 68.6 points (range, 35 to 80 points), respectively, preoperatively to 86.0 points (range, 74 to 95 points) and 92.4 points (range, 60 to 100 points), respectively, at the final follow-up (p < 0.001). The mean range of motion of the knee was recovered from 127.1° (range, 110° to 135°) preoperatively to 131.6° (range, 120° to 135°) at the final follow-up. The mean tibiofemoral angle changed from 6.2° of valgus (range, 0.1° to 11.4° of valgus) preoperatively to 3.4°of valgus (range, 0.2° to 9.5° of valgus) at the final follow-up. The overall results classified based on the KS knee score were "excellent" in 21 cases and "good" in 8 cases. Revision total knee arthroplasty was required in one case because of consistent pain on the medial side of the knee after surgery.
CONCLUSIONS
The early clinical results of lateral UKA using the ZUK prosthesis were satisfactory for improvement of pain, knee score, function score, and recovery of knee motion. Therefore, the lateral UKA could be a useful method in the treatment of osteoarthritis in the lateral compartment of the knee. Long-term survivorship remains to be confirmed through ongoing follow-up.

Keyword

Knee; Osteoarthrits; Unicompartmental arthroplasty

MeSH Terms

Aged
Aged, 80 and over
Arthralgia/physiopathology
*Arthroplasty, Replacement, Knee/adverse effects/methods/statistics & numerical data
Female
Follow-Up Studies
Humans
Knee Joint/diagnostic imaging/physiopathology/surgery
Male
Middle Aged
*Osteoarthritis, Knee/diagnostic imaging/physiopathology/surgery
Range of Motion, Articular/physiology
Tomography, X-Ray Computed

Figure

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  Fig. 1 (A–C) Preoperative radiographs of a 60-year-old woman showing lateral osteoarthritis of both knees. (D, E) Follow-up radiographs taken 3 years after the Zimmer unicompartmental high-flex knee (Zimmer) arthroplasty.

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  Fig. 2 (A, B) Preoperative radiographs of a 56-year-old man showing lateral osteoarthritis of the left knee with tibia vara deformity of both knees. (C) Follow-up radiograph taken 6 months after Zimmer unicompartmental high-flex knee arthroplasty. (D) Follow-up radiograph taken 4 months after additional high tibial osteotomy. (E) Radiograph of the left knee after conversion total knee arthroplasty.

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