CLINICAL OUTCOMES AFTER UNICOMPARTMENTAL KNEE ARTHROPLASTY FOR OSTEONECROSIS OF THE KNEE

Overview

Journal Acta Ortop Bras

Specialty Orthopedics

Date 2021 Apr 2

PMID 33795962

Citations 2

Authors

Tomoyuki Kamenaga

Takafumi Hiranaka

Yuichi Hida

Takaaki Fujishiro

Koji Okamoto

Affiliations

Soon will be listed here.

Abstract

Objective: Although the mobile-bearing Oxford unicompartmental knee arthroplasty (OUKA) seems an appropriate procedure to treat spontaneous osteonecrosis of the knee (SONK), aseptic tibial component loosening was the leading cause for medial UKA failure. This study aimed to observe short-term and midterm clinical outcomes following OUKA and determine whether tibial lesion affects the procedure clinical and radiographic outcomes.

Methods: Sixty patients (mean age 73.1 ± 6.6 years) diagnosed with SONK in the medial femoral condyle and treated with OUKA were separated into two groups using T1-weighted preoperative magnetic resonance imaging (MRI): group F (necrotic lesion confined to the femur) and group T (necrotic lesion spread to the tibia). The Oxford Knee Score (OKS), maximum flexion angle (MFA), and radiographic findings (radiolucent line and subsidence) were compared between the two groups using unpaired -test.

Results: Both groups showed significant improvement in OKS and MFA values at the final follow-up, but without significant differences in the clinical and radiographic outcomes.

Conclusion: OUKA is a reliable treatment procedure for SONK in the short and midterm. The presence of tibial lesions on preoperative MRI does not affect postoperative radiographic and clinical outcomes. .

Citing Articles

Varus/valgus angle of the femoral component relative to the tibial component increases risk of bearing dislocation in medial mobile bearing unicompartmental knee arthroplasty.

Nan S, Li C, An H, Lian Y, Li H BMC Musculoskelet Disord. 2025; 26(1):75.

PMID: 39833818 PMC: 11744872. DOI: 10.1186/s12891-025-08292-w.

Unicompartmental Knee Arthroplasty Versus Opening-Wedge High Tibial Osteotomy for Spontaneous Osteonecrosis of the Knee: A Retrospective Cohort Study.

Chiu S, Wong C, Chuang A, Chen C, Tan C, Weng P Orthop J Sports Med. 2024; 12(11):23259671241288309.

PMID: 39525353 PMC: 11544757. DOI: 10.1177/23259671241288309.

Unicompartmental knee arthroplasty (UKA) for primary spontaneous osteonecrosis of the knee (SONK): a systematic review.

Saccone L, Franceschetti E, Campi S, Za P, Zampogna B, Esposito C Orthop Rev (Pavia). 2023; 15:73916.

PMID: 37405275 PMC: 10317517. DOI: 10.52965/001c.73916.

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