- See:
-
Radiographic Evaluation of Cemented Femoral Components:
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Exam for THR Loosening:
- Discussion:
- failure to remove soft cancellous bone from medial surface of femoral
neck, so column of cement does not rest on dense cancellous or
cortical bone & support stem;
- failure to roughen the medullary canal sufficiently, especially
smooth surface of the thin layer of dense bone that forms about
stem of a femoral head prosthesis;
- failure to remove sufficient cancellous bone to permit an adequate
column of cement about entire stem - thin column cracks easily;
- tip of the stem should be supported by a plug of cement, since this
part of the stem is subjected to axial loading;
- failure to position componenet in a neutral or mildly valgus position
- varus position increases the moment of bending of the stem;
