14-year follow-up study of a XXXX with massive calcar resorption. A case report.

@entity1 @entity691 @entity572 @entity10256 @entity3677
The authors present an in-depth clinical, radiographic, and pathologic analysis of a 62-year-old @entity1 with massive bone reabsorption around the proximal femur in a @entity572 ( @entity572 ). The @entity572 was revised 13 years after implantation. Thirty millimeters of calcar resorption was noted radiographically. Evidence of stem bending was present on examination of the femoral implant, and marked wear of the acetabular cup was noted. The pathologic evaluation of removed calcar bone and cement revealed a histiocytic mass invading the bone. Intracellular and extracellular @entity10256 debris was noted within the invasive mass. Evidence of fragmented @entity3677 cement was also present. The bone-cement interface in the excised calcar region contained segments that showed active bone remodelling around the cement without an interposed membrane. It is possible that this case of calcar resorption began with histiocytic activation and recruitment by @entity691 wear debris followed by active bone lysis. The process may be perpetuated by the fragmentation of cement, as motion occurred at the calcar bone-cement interface, and may represent an extreme example of a process occurring in cases of calcar resorption in general.
