Radiographic identification of loose bodies in the traumatized hip joint.

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Abstract
Acrylic spacers and cubes of cortical bone of known dimensions were placed in predetermined locations in [human] cadaver hip joints, which were then studied with plain radiography, and linear, hypocycloidal and computed tomography (CT). Joint space widening was not measurable on plain radiographs of the pelvis when 2-mm spacers were placed anywhere within the hip joint. When 4-mm spacers were used, widening measured 2 mm in the axis of measurement corresponding to the location of the spacer. Linear tomography did not permit identification of the 2-mm cubes; hypocycloidal tomography and CT consistently showed them anywhere within the hip joint. Radiation dose and clinical recommendations are discussed.