IMPACT DISSIPATING AND LOAD DIVERTING HIP PROSTHESIS

摘要

A composite total hip arthroplasty prosthesis (1) including a shock-absorbing, elastomeric polymer cushion (10) located between acetabular and subtrocanteric aspects (30 and 4) to reduce the impact factor of an intraskeletal load applied through a patient's pelvis to the proximal femur. The arthroplasty prosthesis includes a force transmitting, diverting and dissipating pendulum member (18) which is located at the subtrocanteric aspect and adapted to rotate laterally into contact with the cushion in response to a vertical intraskeletal load. Accordingly, opposing parallel shear forces generated by such intraskeletal loads which are known, in conventional arthroplasty prostheses, to cause scission of tissue ingrowth or shearing fracture of bone cement fixation procedures may be advantageously redirected, dampened and non-linearly decelerated to produce lateral bone formation stimulating loads rather than vertical tissue ingrowth shearing loads between the subtrocanteric aspect of the prosthesis and the proximal femur of the patient.