Archives of orthopaedic and trauma surgery
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Arch Orthop Trauma Surg · Apr 2008
Treatment of periprosthetic femur fractures with the non-contact bridging plate: a new angular stable implant.
We report the application of a new fixed angle plate (NCB DF, Zimmer inc. USA, Warsaw, IN) in the treatment of periprosthetic femur fractures. The NCB DF combines conventional plating technique with polyaxial screw placement and angular stability. ⋯ The NCB DF combines conventional plating technique with polyaxial screw placement and angular stability. This combination technique shows promising results regarding union and mal-union rates in periprosthetic fractures in elderly and osteoporotic patients.
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Arch Orthop Trauma Surg · Apr 2008
Comparative StudyComparison of the short-term functional results after surface replacement and total shoulder arthroplasty for osteoarthritis of the shoulder: a matched-pair analysis.
The purpose of this clinical study with a matched-pair design was to compare the functional short-term results obtained in patients with primary osteoarthritis of the shoulder treated with cementless surface replacement of the humeral head (CUP) with those obtained after total shoulder replacement (TSR). ⋯ At short-term follow-up, surface replacement as a technically less demanding technique provided only slightly inferior results to TSR. We therefore believe that CUP arthroplasty is a therapeutic option and can be recommended in patients with primary osteoarthritis when limited to strictly defined indications.
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Arch Orthop Trauma Surg · Apr 2008
Comparative StudyComparison of periprosthetic bone remodelling after implantation of anatomic and straight stem prostheses in total hip arthroplasty.
Total hip arthroplasty changes bone loading conditions in the proximal femur and induces adaptive remodelling of the periprosthetic bone. These remodelling processes depend on many implant-specific qualities, e.g. material and elasticity of the stem. The objective of this study was to investigate the effect of the stem design on periprosthetic bone remodelling after insertion of an anatomic stem with proximal fixation and the direct comparison to a straight stem prosthesis. ⋯ After implanting a CTX-S prosthesis, as opposed to PPF prostheses, a different pattern of periprosthetic bone remodelling with a slighter hypertrophy of the distal periprosthetic parts was observed. This implies that the extensive proximal, more physiological bone loading of the anatomic stem as well as the removal of less bone while implanting the stem reduces the negative effects of unphysiological strain distribution and stress shielding. The BMD loss in the medial proximal neck cannot be avoided with this stem design either. The lack of significant BMD changes in the second post-operative year suggests that a stabilisation of bone remodelling processes occurs.