Clinical Orthopaedics and Related Research®
Volume 468, Number 5, 1331-1335, DOI: 10.1007/s11999-009-1213-z

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The Association of Bone and Joint Surgeons®

Clinical Research

Subchondral Insufficiency Fracture of the Femoral Head may be Associated with Hip Dysplasia: A Pilot Study

Kohei Ishihara, Keita Miyanishi, Hidetoshi Ihara, Seiya Jingushi and Takehiko Torisu

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Abstract

Background  

Subchondral insufficiency fracture of the femoral head occurs mainly in elderly patients with osteoporosis. Spontaneous resolution is observed after nonoperative treatment in some patients whereas other show progressive joint destruction requiring THA. Several studies report the occurrence of subchondral insufficiency fracture of the femoral head in dysplastic hips.

Questions/purposes  

We asked whether the extent of hip dysplasia or osteoporosis was greater in patients with subchondral insufficiency fracture of the femoral head than in normal control subjects.

Patients and Methods  

We compared the clinical and imaging findings of 13 patients with subchondral insufficiency fractures of the femoral head and 12 patients scheduled for TKA with asymptomatic hips. Age, gender, and body mass index were comparable in the two groups.

Results  

Higher mean Sharp angles, lower acetabular head indices, lower center-edge angles, and higher acetabular roof angles in patients with subchondral insufficiency fracture of the femoral head than in those with asymptomatic hips suggested a greater degree of hip dysplasia. Bone mineral density and serum levels of Type I collagen cross-linked N-telopeptide and bone alkaline phosphatase were similar in the two groups.

Conclusions  

We speculate an excessive amount of stress on the acetabular edge from dysplasia may be associated with the occurrence of subchondral insufficiency fracture of the femoral head.
One or more of the authors (KM) have received funding to promote the hospital functions of Japan Labour Health and Welfare Organization and a grant from Japan Orthopaedics and Traumatology Foundation, Inc (Number 0165).
Each author certifies that his or her institution approved the human protocol for this investigation, that all investigations were conducted in conformity with ethical principles of research, and that informed consent for participation in the study was obtained.

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