J Lauritzen

Publications (2)9.16 Total impact

• Article: Hip protectors: recommendations for biomechanical testing--an international consensus statement (part I).

  S N Robinovitch, S L Evans, J Minns, A C Laing, P Kannus, P A Cripton, S Derler, S J Birge, D Plant, I D Cameron, D P Kiel, J Howland, K Khan, J B Lauritzen
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  ABSTRACT: Hip protectors represent a promising strategy for preventing fall-related hip fractures. However, clinical trials have yielded conflicting results due, in part, to lack of agreement on techniques for measuring and optimizing the biomechanical performance of hip protectors as a prerequisite to clinical trials. In November 2007, the International Hip Protector Research Group met in Copenhagen to address barriers to the clinical effectiveness of hip protectors. This paper represents an evidence-based consensus statement from the group on recommended methods for evaluating the biomechanical performance of hip protectors. The primary outcome of testing should be the percent reduction (compared with the unpadded condition) in peak value of the axial compressive force applied to the femoral neck during a simulated fall on the greater trochanter. To provide reasonable results, the test system should accurately simulate the pelvic anatomy, and the impact velocity (3.4 m/s), pelvic stiffness (acceptable range: 39-55 kN/m), and effective mass of the body (acceptable range: 22-33 kg) during impact. Given the current lack of clear evidence regarding the clinical efficacy of specific hip protectors, the primary value of biomechanical testing at present is to compare the protective value of different products, as opposed to rejecting or accepting specific devices for market use.
  Osteoporosis International 10/2009; 20(12):1977-88. · 4.58 Impact Factor
• Article: Hip protectors: recommendations for conducting clinical trials--an international consensus statement (part II).

  I D Cameron, S Robinovitch, S Birge, P Kannus, K Khan, J Lauritzen, J Howland, S Evans, J Minns, A Laing, P Cripton, S Derler, D Plant, D P Kiel
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  ABSTRACT: While hip protectors are effective in some clinical trials, many, including all in community settings, have been unable to demonstrate effectiveness. This is due partly to differences in the design and analysis. The aim of this report is to develop recommendations for subsequent clinical research. In November of 2007, the International Hip Protector Research Group met to address barriers to the clinical effectiveness of hip protectors. This paper represents a consensus statement from the group on recommended methods for conducting future clinical trials of hip protectors. Consensus recommendations include the following: the use of a hip protector that has undergone adequate biomechanical testing, the use of sham hip protectors, the conduct of clinical trials in populations with annual hip fracture incidence of at least 3%, a run-in period with demonstration of adequate adherence, surveillance of falls and adherence, and the inclusion of economic analyses. Larger and more costly clinical trials are required to definitively investigate effectiveness of hip protectors.
  Osteoporosis International 10/2009; 21(1):1-10. · 4.58 Impact Factor