Tibial prosthesis
US4769040A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 18, 1986 |
| Grant date | Sep 6, 1988 |
| Priority date | — |
| Expiry date | Nov 18, 2006 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61F2/389
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
An improved tibial plateau prosthesis is described in which a baseplate is anatomically peripherally shaped and provided with a knife edge perimeter which cuts into the soft tissue outer edge of the epiphyseal shell of the tibia and effectively caps the tibia. Hoop stresses are reduced, and the use of wrought metal for the baseplate, inclusion of a deep intercondylar cut out as well as a series of performations at locations corresponding to positions of hardness of the cancellous bone facilitates flexibility more in tune with the properties of the original subchondral bone plate and cartilage which in turn reduces "lift-off" from an unloaded condyle during loading of the other condyle. Bone ingrowth is encouraged by accurate flat cutting and the provision of the perforations. Initial stability is promoted by the knife edge and its asymmetrical circumferential shape.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.