In knee osteoarthritis, which deformity is most common due to medial compartment destruction?

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Prepare for the CMS II Rheumatology E1 Exam with our comprehensive quiz. Study using flashcards and multiple-choice questions, each with hints and explanations. Get ready for success!

Multiple Choice

In knee osteoarthritis, which deformity is most common due to medial compartment destruction?

Explanation:
Medial compartment destruction in knee osteoarthritis leads to loss of the inner joint space, causing the leg to tilt inward under the knee. This creates genu varum, or a bow-legged appearance, because the weight-bearing axis shifts toward the medial side and the tibia becomes deviated medially relative to the femur. This medial collapse is the most common deformity in knee OA. If the lateral compartment were mainly affected, you’d see valgus deformity (knock-knee). Hyperextension and neutral alignment represent different patterns not driven by medial compartment loss.

Medial compartment destruction in knee osteoarthritis leads to loss of the inner joint space, causing the leg to tilt inward under the knee. This creates genu varum, or a bow-legged appearance, because the weight-bearing axis shifts toward the medial side and the tibia becomes deviated medially relative to the femur. This medial collapse is the most common deformity in knee OA. If the lateral compartment were mainly affected, you’d see valgus deformity (knock-knee). Hyperextension and neutral alignment represent different patterns not driven by medial compartment loss.

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