Elbow replacement apparatus and methods
AssigneesLimacorporate S.P.A., New York Society for the Ruptured and Crippled Maintaining the Hospital for Special Surgery
InventorsMichele Pressacco, Nicola Del Negro, Andrea Fattori, Robert N. Hotchkiss, Mark P. Figgie, Timothy M. Wright, Joseph D. Lipman, Darrick Lo
Life of this patent
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Abstract
Apparatus and methods for total elbow replacement are provided to allow a surgeon to intraoperatively select a linked or unlinked constraint by utilizing a connection located on the body of the ulnar and/or humeral stem. Additional modularity also allows the selection of a cemented or cementless stem as described herein. The modularity and adjustability provides a number of advantages.
Claims8
A convertible elbow prosthesis comprising:
- a humeral component (119) comprising a humeral stem (101) and a humeral condyle body (102), the humeral condyle body (102) comprising two distally extending condyle portions (118) each having a condylar bearing surface (121), a bushing hole (117) extending through the condyle portion (118), and a humeral bushing (103) retained inside the bushing hole (117) by mechanical interference, the humeral bushings (103) configured to receive a hinging axle (106) along a hinging axis (112);
- an ulnar component (104) comprising an ulnar stem (110), an ulnar body (107), and an ulnar bearing (105) detachably coupled to the ulnar body (107), the ulnar body (107) comprising a central fin (137) provided with an ulnar coupling hole (143), the ulnar bearing (105) comprising a central covering fin (130) provided with an ulnar hinging hole (145) and provided, on opposite sides of the central covering fin (130), with two respective articulation housings (139) defining complementary bearing surfaces that receive and articulate with the condylar bearing surfaces (121) of the humeral condyle portions (118);
- and
- a hinging axle (106) comprising a barrel-shaped end portion (153), an opposite barrel-shaped end portion (155), and a mid-portion (106a) therebetween;
- wherein the condyle portions (118) and the ulnar bearing (105) are configured for reciprocal articulation about the hinging axis (112) in an articulation condition;
- wherein the central covering fin (137) of the ulnar bearing (105) comprises a coupling slot (141) configured to receive the central fin (137) of the ulnar body (107);
- wherein the ulnar coupling hole (143) is aligned with the ulnar hinging hole (145) along said hinging axis (112) when the ulnar bearing (105) is coupled to the ulnar body (107);
- wherein the ulnar coupling hole (143) and the ulnar hinging hole (145) are further aligned with said humeral bushings (103) along said hinging axis (112) in said articulation condition,
- wherein the hinging axle (106) passes through the humeral bushings (103), through the ulnar hinging hole (145), and through the ulnar coupling hole (143), and wherein the mid-portion (106a) of the hinging axle (106) is fixedly attachable to said ulnar coupling hole (143);
- wherein each of the humeral condyle portions (118) comprises an inner articulation annular wall (115) defining a central face (116) of the respective humeral condyle portion (118),
- the central faces (116) articulating with lateral surfaces (131) of the central covering fin (130) of the ulnar bearing (105);
- wherein said bushing holes (117) are delimited, on the inner side of the condyle portions (118), by the articulation annular walls (115).
Dependencies are inferred from the claim text.