Summary Statement

In a retrospective study, FE-based bone strength from CT data showed a greater ability than aBMD to discriminate proximal femur fractures versus controls.

Aims: This study evaluates the clinical results of acetabular revision with Lima SPH Anatomic cup in 63 cases, performed at our Institute since 1999. Methods: We have evaluated 63 acetabular revision with SPH Anatomic cup in retrospective way. All the cases were produced by aseptic loosening and bone loss was in stage I or II according to GIR classiþcation (simple acetabular enlargement or one wall defect). The evaluation occurred after 1 to 3.5 years. Results: Preoperative mean Harris Hip Score was 54 and at time of evaluation it was 91. No sign of loosening was found. The mean cranial elevation of centre of rotation was preoperatively 13 mm and postoperatively 9 mm. Conclusions: The good results obtained with this kind of cup can be explained through its peculiarities: the emispheric design with the cranial ßange permits a press-þt þxation in presence of sufþcient bone stock and an exact-þt þxation with screws when the wall defect is important. In our opinion the 18û automatic antiversion of the implant is helpful in cases in which there is a great posterior wall defect and a traditional cup could determinate a wrong, retroverted orientation of the acetabulum.

As we can see, a cranial elevation of the centre of rotation is well tolerated because less than 1 cm, and many Authors agree with us upon this consideration.

In conclusion SPH Anatomic cup is a good solution for acetabular revision with minimal to moderate bone loss.