ON THE BREAKAGE OF HINGE-TYPE PROSTHESIS OF THE KNEE JOINT : STUDY ON TWO CASES

概要

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Total knee prosthesis for reconstruction of knee joint makes remarkable progress. Presently, two types of prosthesis are available. One is Hinge-type prosthesis and another is Hingeless-type. Hingeless-type prosthesis duplicates the normal movement of the knee joint, but it requires to maintain the normal intrinsic stability of the knee joint. Hinge-type prosthesis has the joint stability in itself, so it is suitable for severely destructed knee, but it does not allow the physiological polycentric movement of the knee joint, which are rotation, gliding and pseudohinge motion. Hinge-type prosthesis allows monocentric movement only.<BR>We applied the Hinge-type knee joint prosthesis for two cases, one of which was giant cell tumor on the femoral condyle and another was the same tumor on the high tibial region. Postoperative breakage of joint part of the prosthesis did occur in both of the cases, in the femoral case on eleven months and in the tibial cases on two years five months after the surgery. From the findings of broken surface of the prosthesis, it was apparently concluded that the breakage was occured by rotatory stress which was repeatedly given to the joint part by daily living activity. Biomechanical relationship between Hinge joint and physiological knee joint movement was discussed.
北関東医学会の論文