Prosthetic device for a complex joint

A prosthetic joint for replacement of a natural joint, having

• a first prosthetic part (11) including
• a bone attachment portion (2156), and
• a condylar portion;
• a second prosthetic part (2117, 2817) including
• a bone attachment means (2125),
• an essentially planar sliding surface (23, 24), and
• first pivotal means defining an axis of rotation (39);
• an intermediate part (2113, 2813) located between said first and second prosthetic parts, said intermediate part including
• a bearing surface (21) on one side thereof for cooperation with said condylar portion;
• a second pivotal means for cooperation with said first pivotal means, said first and second pivotal means forming a rotary joint and rotationally connecting the intermediate part with one of said prosthetic parts (11;
• 17, 1317, 1917, 2117, 2817);
• first guide means (35, 1335, 1735, 1935) located on the intermediate part on a side thereof opposite to said one side having the bearing surface (21);
• second guide means (15) arranged for cooperation with said first guide means,
• one of said guide means extending in substantially anterior-posterior direction;
• coupling means coupling the intermediate part means and the second prosthetic part, including said second guide means;
• wherein the coupling means additionally includes a stabilizing portion;
• and
• wherein said first prosthetic part (2111) includes a stabilizing section (2114) in operative association with the stabilizing portion (2136) of said coupling means (2115), said stabilizing portion and stabilizing section, respectively, having engageable surfaces to provide for stabilization of the prosthetic joint in the event that natural ligaments are weak or missing.

A prosthetic joint for replacement of a natural patella-femoral joint, having

• a first prosthetic part (1011) including
• a bone attachment portion, and
• a condylar portion (1019);
• a second prosthetic part (1017) including
• a bone attachment means (25),
• an essentially planar sliding surface (24), and
• first pivotal means (31) defining an axis of rotation (39);
• an intermediate part (1013) located between said first and second prosthetic parts, said intermediate part including
• a bearing surface (1021) on one side thereof for cooperation with said condylar portion (1019);
• a second pivotal means (33) for cooperation with said first pivotal means, said first and second pivotal means forming a rotary joint and rotationally connecting the intermediate part (1013) on a side thereof opposite to said one side having the bearing surface (21);
• second guide means arranged for cooperation with said first guide means, and
• coupling means (15-35) coupling the intermediate part and the second prosthetic part, including said second guide means;
• wherein the condylar portion of the first prosthetic part comprises a condyle (1019) with an outer concave surface;
• and
• wherein the intermediate part (1013) is formed with a convex surface (1021) fitting the concave surface (1019) of the condyle of the first prosthetic part.

A prosthetic joint for replacement of a nature joint having

• a first prosthetic part (11) including
• a bone attachment portion (2156), and
• a condylar portion (19);
• a second prosthetic part (1317, 1917) including
• a bone attachment means (25, 27, 1327),
• an essentially planar surface (1323), and
• first pivotal means (1333, 1933) defining an axis of rotation (39);
• a second pivotal means (1331, 1931) arranged for cooperation with said first pivotal means, said first and second pivotal means forming a rotary joint;
• an intermediate part including
• a first intermediate part (1313), 1513, 1713, 1913) and
• a second intermediate part (1315, 1715, 1915);
• the first (1313, 1513, 1713, 1913) intermediate part having a bearing surface (21) formed on one side thereof for cooperation with said condylar portion (19);
• an engagement surface formed on the second intermediate part for engagement on said planar surface of the second prosthetic part (1317, 1917);
• first guide means (1335, 1735, 1935) located on the first intermediate part on a side thereof opposite to said one side having the bearing surface (21);
• a second guide means (1316, 1716, 1916) arranged for cooperation with said first guide means and located on the second intermediate part (1315, 1715, 1915), and wherein
• one of said first and second guide means extend in a substantially anterior-posterior direction;
• said first and second guide means are located, respectively, on said first intermediate part and second intermediate parts at facing surfaces, and include coupling means coupling the first intermediate part and second intermediate part together;
• and
• wherein the rotary joint connects said second prosthetic part (1317, 1917) and said intermediate part means.