Abstract:Objective To analyze the correlation between cam deformity and subchondral bone thickness of acetabulum and histological characteristics of hip osteoarthritis by measuring the thickness and αangle ofacetabulum in patients with cam-type femoroacetabular impingement syndrome.Methods 109 patients with hip joint MRI in our hospital were retrospectively analyzed,including 65 male and 44 female,with an average age of (29.4±1.2).The thickness of the subchondral bone of the acetabulum was quantified,and the correlation between cam deformity and the degree of sclerosis of the subchondral acetabulum was analyzed.Results 23 patients had camtype femoroacetabular impingement syndrome with angle of α≥50°and 86 patients had no cam deformity with angle of alpha <50°.The incidence was 21.1%.The thickness of subchondral bone in cam-shaped deformity was 0.71 mm thicker than that in non-cam-shaped deformity(P<0.05).The subchondral bone thickening of the cam deformity of the acetabulum was different,mainly in the anterior and upper part of the acetabulum.There were 7 deformities in the cam deformity.They were circular darts,thin layers,lenses,hooks,arcs,clouds and droplets.Conclusion There is a correlation between cam deformity and subchondral bone thickness of acetabulum.The thickness of subchondral sclerosis of acetabulum with cam deformity is higher than that of normal acetabulum,which was consistent with the early histological characteristics of hip osteoarthritis.
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