Patent ID: 8920510

Claim:
A medical device for implantation in a hip joint of a patient, said medical device comprising: a. a first piece, wherein i. said first piece is adapted to be fixated to the pelvic bone, and ii. said first piece comprises a convex contacting surface adapted to be partially placed inside a concave contacting surface, b. a second piece, wherein i. said second piece is adapted to be fixated to the femoral bone, and ii. said second piece comprises a concave contacting surface adapted to partially surround said convex contacting surface of said first piece, when implanted, and c. a releasing member adapted to, when implanted, in a first state hold said first piece attached to said second piece, and in a second state release said first piece from said second piece, and wherein said releasing member is adapted to change from said first state to said second state when a predetermined strain is placed on said releasing member by the connection with the first or second piece, when implanted, and wherein said medical device comprises a calibration member for calibrating the pre-determined strain required for said releasing member to change from said first state to said second state.