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A 60 year old male with a BMI of 36
10%
135/1419
A 50 year old female with psoriatic arthritis
75%
1059/1419
A 55 year old male with full leg length films revealing 9 degrees of varus malalignment
8%
114/1419
A 45 year old male with a Q angle of 13 degrees
3%
46/1419
A 75 year old male with a prior complete medial meniscectomy
4%
57/1419
Select Answer to see Preferred Response
Inflammatory arthritis is a contraindication to performing a UKA. Unicompartmental knee arthroplasty (UKA) is a partial knee arthroplasty involving a single compartment of the knee. It comprises of 5% of all knee arthroplasty. Classic contraindications to a UKA are inflammatory arthritis, varus deformity > 10 degrees, valgus deformity > 5 degrees, flexion contracture > 5-10 degrees, and a previous meniscectomy in the other compartment. ACL deficiency is a controversial contraindications with some surgeons considering it a viable option in the case of a medial fixed-bearing UKA. Molloy et al. performed a retrospective review of 1000 consecutive medial mobile-bearing oxford UKA with a mean 10-year follow-up. Patients were grouped: BMI < 25, BMI 25 to < 30, BMI 30 to < 35 and BMI 35+ and the oxford Knee Score (OKS) and Tegner Activity Score were assessed at 1, 5 and 10 years. The authors noted that all groups had significant improvement in OKS and Tegner scores. There was no significant difference in ten-year survival, which was, from lowest BMI group to highest 92%, 95%, 94% and 93%. The authors concluded that when UKA is used for appropriate indications, high BMI should not be considered to be a contraindication. Tabor performed a review of a retrospective review of 67 medial UKAs with a minimum 5-year follow-up. The authors noted survivorship was 91% at 5 years, 84% at 10 years, and 79% at 15 years. Survivorship and functional outcome were not affected by body habitus, age, gender, or tibial component thickness. UKA offers long-term relief of symptoms and excellent knee function in a high percentage of carefully selected patients with single compartment osteoarthritis Incorrect Answers: Answer 1: Weight is no longer considered a contraindication to a UKA Answer 3: Varus deformity greater than 10 degrees is considered a contraindication to a UKA Answer 4: Age is no longer considered a contraindication to a UKA. A Q-angle of 13 degrees in a male is considered normal Answer 5: A prior complete LATERAL (not medial) meniscectomy would be a contraindication to a medial UKA
3.3
(4)
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