MS-30™ Hip - Design Rationale
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Biomechanical Concept In the intact femur, the forces acting on the head are distributed between the cancellous trabeculae and the cortical layer and are transmitted from the proximal femur to the diaphysis.The philosophy of the MS-30 stem is based on the allocation of these specific biomechanical forces to the three components: prosthesis/cement/bone. The cement should not act as a passive filling material, but as an integral component of the interlocking prosthetic structure. The MS-30 is designed to evenly distribute medial compressive forces while minimizing lateral tensile forces within the cement mantle. |
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The Cement The cement is the most sensitive element of the stem/cement/femur system and can therefore restrict the life of the implant. A proximal cement thickness of 4-7mm in the calcar area and a distal cement thickness of 1-3mm around the prosthesis is recommended for optimal implant performance. The cement pressure during the insertion of a cemented stem into a femoral canal can be represented by a curve graph. With the MS-30, a consistent cement pressure can be achieved through the use of a cement sealing collar during stem insertion and final polymerization. This consistent pressure will allow for the formation of a homogeneous and uninterrupted cement mantle which interdigitates with cancellous bone. |
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