Osteoarthritis of the knee is a common condition in which the cartilage covering the ends of the bones of the knee joint breaks down, permitting the bones to grind against each other. This painful condition affects 6% of the adult population in the United States, causing considerable disability and reduced quality of life. The exact cause of the disorder is unclear, but some research has suggested that people with unequal leg lengths are more likely to have the condition. Now, a study has confirmed an association between discrepant leg length and an increased risk of progressive or new-onset knee osteoarthritis. The results were published in the Annals of Internal Medicine (March 2, 2010).
Measuring leg length
In the Annals study, leg length was measured with x-rays and defined as the distance from the center of the ball of the hip joint (femoral head) to the front of the ankle above the joint (tibial mid-plafond point). A tape measure is less precise but much simpler to use: with the patient lying on her back, the clinician measures from the bony point on the front of the pelvic bone (anterior superior iliac spine) to the bony part of the inner ankle joint (medial malleolus).
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