| 摘要 |
The invention described includes a plunger pin and an osteomedullary cylinder in operational alignment for creating an autogenous cancellous osteomedullary bone cylinder within a femoral neck. The osteomedullary cylinder includes and inner surface and an outer surface in coaxial alignment so as to establish a material width of the osteomedullary cylinder of a shape and a dimension adapted to induce a stable circumferential fracture therewithin the femoral neck. The stable circumferential fracture is of a dimension to allow substantial proximal advancement of the autogenous cancellous osteomedullary bone cylinder within the femoral neck and into the femoral head so as to bone graft in situ and thereby promote bidirectional new bone formation. The autogenous cancellous osteomedullary bone cylinder has an areal moment of inertia computed by the equation ¼pi(C4-c4) wherein C and c are outer and inner radii, respectively, thereof. Other embodiments of the invention and the essentials of bone physiology are described.
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