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Baseline side-to-side joint space width (JSW) distribution for knees in the control and anterior cruciate ligament (ACL) groups. *The JSW in the lateral compartment of ACL-injured knees was significantly different from that of the contralateral knee as well as from knees in control patients at baseline. C, control; U, uninjured knee in ACL group; I, injured knee in ACL group; x, female; o, male.
