Acetabular Anatomical Parameters in Patients With Idiopathic Osteonecrosis of the Femoral Head |
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| Institution: | 1. Department of Orthopaedic Surgery, Putrajaya Hospital, Putrajaya, Malaysia;2. Department of Orthopedic Surgery, Seoul Metropolitan Government-Seoul National University Boramae Medical Center, Dongjak-gu, Seoul, South Korea;3. Department of Orthopaedic Surgery, Seoul National University College of Medicine, Seoul National University Bundang Hospital, Seongnam-si, South Korea;4. Department of Orthopaedic Surgery, Seoul Hospital, Seongnam-si, South Korea;5. Department of Orthopaedic Surgery and Traumatology, Sarawak General Hospital, Kuching, Malaysia;1. Orthopedic Research Institute, Holy Cross Hospital, Ft. Lauderdale, FL;2. Department of Orthopaedic Surgery, Massachusetts General Hospital, Boston, MA;3. Department of Orthopaedic Surgery, Northwell Health, Lenox Hill Hospital, New York, NY;4. Department of Orthopaedic Surgery, Cleveland Clinic Hospital, Cleveland, OH;5. Department of Orthopaedic Surgery, University of Miami Hospital, Miami, FL;1. Department of Orthopaedic Surgery, Westchester Medical Center, Valhalla, NY;2. Department of Orthopaedic Surgery, Loma Linda University Medical Center, Loma Linda, CA;3. Department of Orthopaedic Surgery, Wake Forest University Baptist Medical Center, Winston-Salem, NC;4. Department of Orthopaedic Surgery, University of Virginia Health System, Charlottesville, VA |
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| Abstract: | BackgroundOsteonecrosis of the femoral head (ONFH) is an increasing worldwide health problem. However, about 30% of the patients are diagnosed with idiopathic ONFH, which means no underlying etiology is identified. We hypothesized that acetabular anatomical abnormalities might be related to idiopathic ONFH.MethodsThis retrospective, 1:2 matched, case-control study included 101 patients (136 hips) with idiopathic ONFH and 202 control subjects (404 hips) matched for age, gender, and body mass index who had no apparent radiographic hip pathologies. The anteroposterior pelvic X-rays of the patients and control subjects were used to measure the anatomical parameters including the center-edge angle, the sharp angle, the acetabular depth ratio (ADR), and the acetabular head index (AHI).ResultsWe found that hips with idiopathic osteonecrosis had less acetabular coverage, lower center-edge angle (28.3° vs 32.3°, P < .001), acetabular depth ratio (298.0 vs 306.4, P = .006), and acetabular head index (82.2 vs 85.8, P < .001), and higher sharp angle (39.7° vs 38.0°, P < .001), compared with the control subjects. The incidence of acetabular dysplasia was also higher in the idiopathic ONFH group than the control group.ConclusionLess acetabular coverage was found in hips with idiopathic osteonecrosis than the control subjects. Less acetabular coverage may be associated with the development of ONFH in East Asian population. |
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| Keywords: | osteonecrosis of the femoral head acetabular coverage idiopathic CE angle morphology |
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