Posteriorly stabilized total knee joint prosthesis
US4298992A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 21, 1980 |
| Grant date | Nov 10, 1981 |
| Priority date | — |
| Expiry date | Jan 21, 2000 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61F2/3886
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A box-like recess between the condylar portions of the femoral component has a transverse convexly curved cam follower portion at the posterior extremity of a superior wall which engages a concave cam surface at the inferior portion of the posterior surface of a tibial post that extends up from the plateau surface of the tibial component into the recess. The camming action between the cam follower and cam surface forces the zones of contact between the condylar portions of the femoral component and concavities in the tibial component posteriorly as the leg approaches full flexion, thereby increasing the range of flexion without interference between posterior surfaces of the femur and the tibial component and preventing anterior dislocation of the femur. The plateau of the tibial component slopes inferiorly and posteriorly, also to increase the range of flexion without interference.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.