The Biomechanics of Ipsilateral Intertrochanteric and Femoral Shaft Fractures: A Comparison of 5 Fracture Fixation Techniques

Abstract

All constructs showed no statistical differences when compared with one another, with the exception of construct E, which provided the least torsional stiffness. However, the current in vitro model did not simulate fracture healing or support offered by soft tissues, both of which would affect the stiffness and load-to-failure levels reached.

Biomechanical stress maps of an artificial femur obtained using a new infrared thermography technique validated by strain gages

“…Also, a minimum 3-5 Hz loading frequency is required to produce an adequate cyclic surface temperature gradient on the test specimen, which then must be synchronized to the IR camera. Stress maps cannot be generated for one-time events like catastrophic failure of a femur or femur-implant interface [8][9][10][11]13,14,18,19,25,27,[32][33][34][35], since this does not generate a cyclic temperature gradient for synchronization to the IR camera. The high cost of purchase of an IR thermography camera may dissuade some researchers from obtaining one, although some manufacturers of the system may be willing to rent the system.…”

“…Adduction of femurs is often done in biomechanical studies between 7 • and 25 • [8][9][10][11][12][13][14][15][16][25][26][27]. Proximally, using a 60-mm diameter smooth steel acetabulum-like cup, a vertical (i.e.…”

“…Consequently, biomechanical studies have been frequently done on human cadaveric femurs or experimentally validated artificial femurs to assess orthopaedic implants used in femoral fracture repair, such as intramedullary nails, extramedullary plates, and cancellous screws, and lower extremity joint replacement, such as total hip prostheses, total knee prostheses, and hip resurfacings [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24]. However, relatively fewer experimental and computational studies have evaluated the intact whole femur's overall stiffness and strength under various loading regimes, such as axial compression, lateral bending, and torsional loading, which simulate either normal activities of daily living or injury mechanisms [25][26][27][28][29][30][31].…”

The Biomechanical Effect of Proximal Tumor Defect Location on Femur Pathological Fractures

“…Similar test regimes and parameters to those currently employed were used in prior studies on synthetic and human femurs. [18][19][20][21][22][23][24][25][26][27][28][29][30][31] All tests were done on a materials testing machine (Model 8874; Instron, Norwood, MA), stiffness was the slope of the force-versus-displacement graph, stiffness results were based on an average of 3 trials, and specimens remained within the linear elastic region to prevent permanent damage before the final axial strength tests, yielding a mean linearity of R 2 = 0.91-0.99.…”

Ipsilateral Proximal, Shaft and Distal Femoral Fracture and Fixation

“…Currently, distal anatomical LISS plates are good alternatives in the (9) reported successful results with the combination of LISS plates and proximal femoral nails in the treatment of ipsilateral proximal and distal femoral fractures. Biomechanical studies with combined application of implants for stable fixation of these fractures revealed successful results (10).…”