PubMed · 15137299
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John Appleby. 2004-04-29. Data briefing. Reference costs.. https://pubmed.ncbi.nlm.nih.gov/15137299/
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In this paper an application of the boundary element method for simulating wear in total hip prosthesis is presented. Several examples including different update periods of the worn acetabular cup, various femoral head sizes and various materials for both the femoral head and the acetabular cup are simulated under the same variable loading conditions for up to 20 years of service. Moreover, two different femoral models are considered in order to investigate the influence of the femoral modelling. The analysis demonstrates that due to the boundary only modelling requirement, the computational time and storage remains low, allowing large service periods to be simulated. Generally, the results obtained are in good agreement with other researchers findings. Moreover, ignoring the bending of the femoral neck in the model, results in a small overestimation of the maximum wear depth, while the volumetric wear is slightly underestimated. However, these differences are trivial considering the reduction of the computational effort.
This study arose from a concern about the transmission of infection through conjunctival contamination during total joint arthroplasty surgery. A prospective analysis of 110 sets of personal face and eye protective equipment (Sterishields) used for 29 total hip arthroplasties (THA) and 26 total knee arthroplasties (TKA) were examined for macroscopic contamination. In additition, a postal questionnaire regarding the perceived risk of eye contamination and current practice of eye protection used during TKA and THA surgery was sent to 1500 Fellows of the British Orthopaedic Association. All Sterishields demonstrated macroscopic contamination with an average of 203 blood and fat spots. The number of these was significantly higher in the lower half of the Sterishields. Of the 834 useable replies, 48% of respondents did not use adequate eye protection routinely. Twenty-eight percent felt that no eye protection was needed, while 45% felt that the eye protection available compromised their vision and so did not use it. One hundred and seven respondents (13%) reported being aware of eye contamination, while 21 (2.5%) respondents were aware of at least one case of conjunctival infection following contamination. This study demonstrates that there is a high risk of conjunctival contamination with fat and blood in major total joint arthroplasty. The reported use of appropriate eye and face protection in the UK has been shown to be low (52%).
INTRODUCTION: Many reports have suggested that Chiari pelvic osteotomy would improve the results of acetabular component placement and fixation in subsequent total hip arthroplasty. However, little is known concerning the biomechanical, radiological, and clinical effects of Chiari pelvic osteotomy on subsequent total hip arthroplasty. MATERIALS AND METHODS: Ten total hip arthroplasties for developmental dysplasia of the hip after previous Chiari pelvic osteotomy (Chiari group) were compared with 20 total hip arthroplasties for developmental dysplasia of the hip without previous surgery (control group). Preoperative patient demographic data and operative technique were well matched between the groups. The mean duration of follow-up was 3.0 years. Biomechanical, radiological, and clinical evaluations were performed. RESULTS: No acetabular or femoral components exhibited loosening. All patients had good or excellent clinical score according to the Merle d'Aubigne-Postel rating system at the most recent follow-up. Abductor force and joint force were smaller in the Chiari group, although long operative time, more blood loss, and verticalization of joint force were noted in this group. CONCLUSION: This limited study suggested that Chiari pelvic osteotomy changed the biomechanical features of the hip joint, and that this alteration might have compromised subsequent total hip arthroplasty.