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The unicompartmental arthroplasty was performed for spontaneous osteonecrosis of the knee
2%
62/3376
An ACL reconstruction with bone-tendon-bone patellar tendon autograft was performed 30 years ago
4%
145/3376
The patient has an unrecognized diagnosis of rheumatoid arthritis
47%
1586/3376
Moderate patellofemoral arthrosis was noticed at the time of her partial knee replacement
43%
1447/3376
The patient had a medial meniscectomy 10 years prior to her unicompartmental arthroplasty
71/3376
Select Answer to see Preferred Response
Because rheumaoid arthritis affects the whole joint and not just one individual compartment, it is considered an absolute contraindication to a partial knee replacement. Unicompartmental arthroplasty is generally considered an excellent procedure provided that appropriate surgical indications are used for patient selection. Classic indications for unicompartmental arthroplasty include unicompartmental disease in patients older than 60 with relatively low activity demands. Additionally, the patients should weigh less than 82 kg, have minimal pain at rest, have motion >90 degress, and have minimal flexion and angular deformities. While most of these classic indications are still used today, recent studies are showing excellent results in younger, heavier, and more active patients. Heyse et al. retrospectively review the results of unicompartmental arthroplasty for spontaneous osteonecrosis of the knee (SONK). 75.7% of patients were "very satisfied" with the procedure and 21.6% were "satisfied." At 15 years, 90.6% of unicompartmental arthroplasties had not been revised. Overall, the authors feel it is an excellent procedure for SONK. Incorrect Answers: Answer 1: Unicompartmental arthroplasties have shown excellent results for patients with SONK. Answer 2: A prior ACL reconstruction is not a contraindication to performing a unicompartmental arthroplasty. Answer 4: Asymptomatic patellofemoral arthrosis is not considered a contraindication. Answer 5: A prior medial meniscectomy is not a contraindication for a unicompartmental arthroplasty.
1.2
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