| abstract |
Graft for a bone defect, in particular a tibial head graft for a knee-joint endoprosthesis. It comprises a sleeve-like inner body ( 2 ) for implantation at one end of a long bone ( 99 ). An outer face of the inner body ( 2 ) is designed as a bone contact face ( 20 ) for bearing on the surrounding bone margin ( 97 ). According to the invention, an outer shell piece ( 3 ) is provided which, as a bone replacement piece, is doubled onto the outside of the inner body ( 2 ) for filling a defect at the cortical bone margin ( 97 ) and is not dimensioned peripherally, such that, in the circumferential direction, it covers only a part of the outer circumference of the inner body ( 2 ). The doubled outer shell piece ( 3 ) forms a filler piece for a bone defect (bone window 96 ) at the bone end. Closure of the bone window ( 96 ) is achieved, and unwanted contact between the graft and surrounding soft-tissue parts is avoided. Moreover, the graft is thus also supported in the region of the bone window ( 96 ). Parts of the bone margin ( 97 ) that are still present can thus remain intact, allowing the greatest possible preservation of naturally present bone substance. |