![]() Stress shielding, referring to the reduction of load transferred to the surrounding bone, is an important factor to cause bone resorption and implant failure. Thus, conservation of bone stock is an important principle, particularly in young patients. Failure and loosening of THA is often characterized by bone loss and compromises revision and anchorage of further implants. However, despite the excellent outcome and long-term results of the cementless THA systems, failure of the implants still occurs. Cementless THA has recently become a standard procedure and is preferentially used in younger patients. Total hip arthroplasty (THA) has become a surgical procedure with excellent results in patients with severe degenerative or traumatic arthritis of the hip. These load patterns implicate a reduced stress shielding proximally for metaphyseal anchoring SHA stems and might be able to translate in a better bone preservation. However, the metaphyseal anchoring SHA features a clearly favorable pattern in terms of a lower reduction proximally and improved metaphyseal loading, while standard THA shows a higher proximal unloading and more distal load transfer. Conclusionsīoth, short and standard THA, cause unloading of the proximal femur. Moreover, the highest peak stresses were observed metaphyseal for the SHA stem while for the standard THA high stress pattern was observed more distally. The SHA showed less reduction proximally with a significant higher metaphyseal cortical stress compared to standard THA. ResultsĬompared to the native femur, a considerable reduction of cortical stress was recorded after implantation of SHA and standard THA. Von Mises stress was used to investigate the change of cortical stress distribution. The loading configuration was performed with an axial force of 1400 N. Braun Aesculap) and standard THA (CLS, Zimmer-Biomet), were generated from computed tomography datasets. The subject specific finite element models of biomechanical femora, one native and two with implanted metaphyseal anchoring SHA (Metha, B. ![]() As comparative biomechanical reference data are rare we used a finite element analysis (FEA) approach to compare cortical load transfer after implantations of a metaphyseal anchoring short and standard stem in native biomechanical femora. Short stem total hip arthroplasty (SHA) preserves femoral bone stock and is supposed to provide a more natural load transfer compared to standard stem total hip arthroplasty (THA).
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