Enarthrodial type joint socket implant

Details Enarthrodial type joint socket implant Enarthrodial type joint socket implant

1998-09-25

2000-10-24

Snow, Bruce

Prosthesis (i.e., artificial body members), parts thereof, or ai

Implantable prosthesis

Bone

623 2211, A61F 234

Patent

active

061360341

ABSTRACT:
An enarthrodial type joint socket implant, for example, for total hip replacement, can contain a modified surface configuration of its cement-fixable outer wall having small, widely dispersed cement spacer elevation members, for example, rectangularly-oriented cement spacer elevation members in block form with dove tailed configurations, which are sufficiently high to provide an appropriately thick cement mantle to assure an optimally proficient implant-stabilizing cement mantle which is universally consistent and technically routine to implant. It can, in addition or independently, have, and this is especially pertinent to conventional hip replacement acetabular cup prostheses, a unique snap-fitted arrangement of the head-restraining marginal outlet of the acetabular component having posterior and anterior cut outs of the implant to avoid premature impingement against a prosthetic femoral neck, allowing a normal, non-dislocating range of unobstructed external and internal rotation of the hip, and a hood that is a marginally extended continuation of the superior one-half or so of the cup containment that is of a sufficient magnitude to reduce the overall dimension of the socket outlet to less than a hemisphere. The implant can be suitably adapted for use in other enarthrodial type joints such as the shoulder.

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BioPro, Inc., "The Biopro Ceramic Tara," brochure, Oct. 1997.
BioPro, Inc., "PSL Total Hip Replacement System," brochures, 1991, re-published 1997.
Townley, Orthopedic Clinics of North America, vol. 13, No. 4, Oct. 1982, "Hemi and Total Articular Replacement Arthroplasty of the Hip with the Fixed Femoral Cup," pp. 869-894.
Jacobs, Transactions of the 24th Annual Meeting of the Society for Biomaterials, Apr. 22-26, 1998, San Diego, California, p. XLVII: "Wear--The Clinical Problem: Total Hip Replacement."

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