The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 23, 1990
Filed:
Aug. 27, 1987
Roy D Bloebaum, Phoenix, AZ (US);
Harrington Arthritis Research Center, Phoenix, AZ (US);
Abstract
An improved prosthesis particularly for use as a knee joint is designed for secure ingrowth attachment to cancellous bone and adjacent tissue without use of bone cement. The prosthesis comprises a tibial component and a femoral component shaped to accommodate articulatory knee joint motion and each including a base surface adapted for enhanced bone ingrowth attachment to cancellous bone of a resected tibia and femur, respectively. The base surface of each component includes an extended surface area protruding into a region of cancellous bone and subdivided into a plurality of attachment zones coated with a selected porous bone ingrowth material, wherein these attachment zones are bounded by uncoated shallow channels for draining fluid from the attachment interface to the exterior of the prosthesis. In addition, each base surface includes one or more relatively thin anchoring fins extending in a medial-lateral direction for improved locking against component rotation while avoiding stress shielding of the ingrowth attachment interface, thereby achieving improved ingrowth fixation.