| abstract |
The present invention relates to tools and stents for implementing an implantation method which must significantly reduce the soft tissue lesions, hitherto unavoidable, as well as bone loss, and which must ensure better anchoring of prostheses. A pelvic fixation (h) and a control apparatus provide a high angular precision bore (a) in the proximal femur and the femoral head or upper arm and humerus head. These parts should be stretched only 2.7 cm from the joint cavity, by means of an extension rail (e) (in the hip, this operation is performed when the hip joint is in the folded position) . A pre-extension device makes it possible to obtain the necessary flexibility of the capsule of the joint. Thus, close access by the soft parts (i) is sufficient to introduce burs and prostheses (f) into the joint using a gripper. The drive shafts (a) of the cutters (b, c) and the shank of the cavity cup and the head prosthesis are guided through said bore of high angular accuracy, and the cavity cup and the head prostheses are depressed by a forced fit method and are, if necessary, fixed under tension by a fixation rod (d) and a counterplate (g). The devices used in this process are suitable for resurfacing prostheses and total head prostheses (short stem curved prosthesis, stent plate prosthesis) on the hip and shoulder and to improve the femoral head offset. |