Zeitschrift für Orthopädie und Unfallchirurgie
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Intraoperative periprosthetic femoral fractures (PFF) during the implantation of primary non-cemented total hip arthroplasties (THA) are an increasing problem. Thus, the goal of this study was to analyse the postoperative performance of primary non-cemented THA in patients with intraoperative PFFs, with respect to the patient's subjective health-related satisfaction. ⋯ Mid-term THA performance and patient satisfaction are not influenced by intraoperative Vancouver A and B1 fractures during implantation of the non-cemented BiCONTACT stem compared to a collective without intraoperative fractures during implantation.
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Total hip arthroplasty for high developmental hip dislocations should restore the anatomic hip centre by implanting the acetabular cup in the true acetabulum. The normalisation of the position of the hip may require femoral shortening to avoid the risk of neurological traction injury. In this study group a subtrochanteric transverse shortening with a cement-free stem (Alloclassic-SL) with a rectangular square diameter was used to secure rotation stability. ⋯ The subtrochanteric transverse shortening osteotomy in total hip arthroplasty is a safe and predictable method for restoring the anatomic centre in high development hip dislocation. The intramedullary stability will be secured by the distal rotation stability of the inherent cross-sectional geometry of this stem design without external stabilisation. A Z-shaped osteotomy of the subtrochanteric shortening or additional augmentation with allograft struts and cables is not necessary.
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In a retrospective study, all patients with bilateral cementless Bicontact-Plasmacup total hip arthroplasty in the period May 1993 to June 2000 were followed up clinically and radiologically. ⋯ The results of this study have confirmed the biomechanical concept of the implant system employed. In contrast to the stem design, the cup design and slide bearing options have been supplemented in the meantime. The ceramic bearing was only available from 1997 and was used less often in this group of patients than would be indicated today for patients of the same age and degree of activity.
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A prospective long-term study of the first 250 cementless Bicontact stems implanted in the BG Trauma Centre, Tuebingen, Germany. ⋯ These outstanding results provide enduring support for the philosophy of the cementless and bone-preserving fixation principles underlying the Bicontact hip stem with proximal intertrochanteric transmission of forces and high primary rotational stability.