Acetabular component of hip joint prosthesis

Prosthesis (i.e. – artificial body members) – parts thereof – or ai – Implantable prosthesis – Bone

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A61F 232

Patent

active

050806777

ABSTRACT:
An acetabular implant comprising a metal cup shell (2) adapted for securing to the pelvic bone of a patient and a plastic insert (9) for receiving the ball portion of a hip joint. A cavity (4) of the metal cup shell (2) and the outre surface of the plastic insert (9) are dimensioned to allow a pressure fit of the plastic insert (9) within the cavity (4) at the body temperature of the patient. The inner surface (6, 8) of the metal shell (2) defining the cavity (4) is provided with one or more apertures (10, 16), e.g., a circumferential groove (10) and a radial groove (16), into which the plastic material of the insert (9) may flow when the insert (9) is fitted to provide a mechanical interlock between the insert (9) and cup shell (2), thereby securing the insert (9) against rotational and distractional forces relative to the metal cup shell (2).

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Socket Fixation Using a Metal-Backed Acetabular Component for Total Hip Replacement, The Journal of Bone and Joint Surgery, vol. 64-A, pp. 745-748.
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