Effects of Severe Varus Deformity on Outcomes in Mobile-Bearing UKA

Overview

This study compares the outcomes of unicompartmental knee arthroplasty (UKA) in patients with severe varus deformities (>15°) to those with lesser deformities (<15°). It aims to determine the impact of preoperative deformity on postoperative outcomes.

Background

Unicompartmental knee arthroplasty (UKA) is typically indicated for knees with less than 15° of varus deformity. The implications of performing UKA on knees with greater deformities remain unclear, particularly regarding functional outcomes and the risk of residual varus post-surgery.

Data Highlights

Key Findings

• UKA is traditionally contraindicated for varus deformities greater than 15º.
• The study included 72 matched pairs of patients based on age and gender.
• No soft tissue releases were performed during the surgical procedure.
• Postoperative outcomes were analyzed in relation to preoperative deformity and residual varus.
• 14% of knees in the severe varus group exhibited significant residual varus postoperatively.

Clinical Implications

Surgeons should consider the degree of varus deformity when planning UKA.

Conclusion

This study provides insights into UKA in patients with severe varus deformities.

Related Resources & Content

1. Archives of Orthopaedic and Trauma Surgery, 2026 -- Unicompartmental knee arthroplasty and total knee arthroplasty in patients with 15 or more degrees of varus deformity: age- and gender-matched comparative study of radiographic and clinical outcomes
2. Knee Surgery, Sports Traumatology, Arthroscopy, 2020 -- High Tibial Osteotomy May Be Suitable for Less Than Two-Thirds of Varus Knees to Prevent Excessive Overcorrection of the Medial Proximal Tibial Angle
3. Knee Surgery, Sports Traumatology, Arthroscopy, 2016 -- Assessment of Gait Dynamics Pre- and Post-Corrective Osteotomy in Knee Osteoarthritis Patients with Valgus Deformity
4. Varus Osteotomy as a Rescue Technique for Young Individuals with Symptomatic Patellofemoral Arthritis and Valgus Deformity: A Case Series Analysis at Short to Mid-Term Follow-Up, 2024
5. Consensus statement on unicompartmental knee replacement: A collaboration between BASK and EKS, 2023
6. Does preoperative varus alignment impact functional outcomes in robotic assisted medial unicompartmental knee arthroplasty? mid-term analysis, 2023
7. Restoring coronal pre-arthritic alignment in mobile-bearing unicompartmental knee arthroplasty: mid- to long-term outcomes, 2023
8. Consensus statement on unicompartmental knee replacement: A collaboration between BASK and EKS - PubMed
9. Does preoperative varus alignment impact functional outcomes in robotic assisted medial unicompartmental knee arthroplasty? mid-term analysis - PubMed
10. Restoring coronal pre-arthritic alignment in mobile-bearing unicompartmental knee arthroplasty: mid- to long-term outcomes - PubMed