The stability of cementless cups depends upon the fit of the shell in the reamed acetabulum. Consequently, over-reaming can lead to increased micromotion or traumatic disruption with loss of cementless fixation. Therefore, it is critical that the surgeon knows the…
Healing following bone surgery may be delayed or even prevented if the bone cells are severely injured by the frictional heat generated during the surgical preparation.lT4 However, little is known about the critical temperature that causes a reversible or irreversible…
Abstract In the present investigation a comparison was made between conventional histology, histochemistry, and vital microscopy for assessment of heat induced bone tissue injury. The extent of the bone damage around a burr hole or after heating fibular bone samples…
Deeper Central Reaming May Enhance Initial Acetabular Shell Fixation Background: The initial stability of press-fit acetabular components is partially determined by the reaming technique. Nonhemispherical (NHS) acetabular shells, which have a larger radius at the rim than the dome, often…
Determinants of the primary stability of cementless acetabular cup implants: A 3D finite element study Abstract Primary stability of cementless implants is crucial for the surgical success and long–term stability. However, primary stability is difficult to quantify in vivo and the biomechanical…
Abstract Long-term stable osseointegration of porous-coated acetabular cups depends on bony ingrowth within their porous surface. For ingrowth to take place, one must ensure rigid initial fixation of the implant, by means of screws or by impaction or using a…
Variability of Cutting and Thermal Dynamics Between New and Used Acetabular Reamers During Total Hip Arthroplasty Background: Aseptic loosening of the acetabular component remains one of the leading causes of early failure of total hip arthroplasty. Poor apposition of bone…
Hemispherical and minimally invasive total hip reamers: a biomechanical analysis of use and design Background: The purpose of this study was to determine the accuracy of used and new reamer systems for both hemispherical and minimally invasive (MIS) acetabular reamers.…
Abstract Background Press-fit and screw fixation are important technical factors to achieve initial stability of a cementless acetabular cup for good clinical results of total hip arthroplasty. However, how these factors affect one another in initial cup fixation remains unclear.…
Accuracy of Acetabular Reamers in Total Hip Arthroplasty P Vaughan P Johnston G Keene Abstract Introduction: Serial reamers of incremental diameter are used in the preparation of the acetabulum in Total Hip Arthroplasty. If the reamer is blunt, then the size…