Approximately what percentage of patellofemoral osteoarthritis cases show lateral involvement?

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Prepare for the Medbridge Orthopedic Clinical Specialist Test. Test your knowledge with multiple choice questions, each featuring hints and explanations. Ace your exam with ease!

Multiple Choice

Approximately what percentage of patellofemoral osteoarthritis cases show lateral involvement?

Explanation:
Patellofemoral osteoarthritis commonly affects the lateral facet because the patella tends to track laterally during knee flexion, especially with a larger Q-angle. This lateral tracking concentrates contact stress on the lateral patellofemoral joint, leading to more wear there than on the medial side. As a result, the vast majority of cases show lateral involvement, about 80% of them. So the best estimate is that roughly four-fifths of patellofemoral OA cases involve the lateral facet.

Patellofemoral osteoarthritis commonly affects the lateral facet because the patella tends to track laterally during knee flexion, especially with a larger Q-angle. This lateral tracking concentrates contact stress on the lateral patellofemoral joint, leading to more wear there than on the medial side. As a result, the vast majority of cases show lateral involvement, about 80% of them. So the best estimate is that roughly four-fifths of patellofemoral OA cases involve the lateral facet.

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