Femoral hip prosthesis
AssigneePfizer Hospital Products Group, Inc.
InventorRobert V. Kenna
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Abstract
A femoral hip prosthesis comprises a stem component generally divided into a proximal portion and a substantially longer distal portion. The stem has a slight posterior bow along its length. The proximal portion includes a slight twist of from about 5.degree. to 15.degree., the twist extending in a direction from the anterior to the posterior face of the stem through the medial face thereof. The characteristics of the stem provide a glove fit when inserted into a prepared intermedullary canal in the femur.
Claims14
A femoral hip prosthesis comprising a stem component with an anterior face, a posterior face, a lateral face and a medial face and having a proximal portion and a substantially longer distal portion, the stem being noncircular in cross section and exhibiting a slight posterior bow along its length, the stem further including a twist of from about 5.degree. to 15.degree. in the proximal portion, the twist extending in a direction from the anterior to the posterior face about the longitudinal axis of the stem, thereby providing a more accurate fit between the stem and an intramedullary cavity and positive resistance to rotation of the stem within the cavity.
Dependencies are inferred from the claim text.