Patient specific quantitative analysis of fracture fixation in the proximal femur implementing principal strain ratios. Method and experimental validation
“…In other words, three screws through the femoral neck stiffens the proximal femur on which a fractured, yet fixed femoral head fragment, shows increased elastic rotations when compared to the intact state. There are few publications presenting cortical strain data from femoral neck fracture experiments and such studies have often been performed in order to validate computer models (Eberle et al 2010, Peleg et al 2010). Eberle and colleagues measured cortical strain on the proximal femur in intact cadaver specimens and after implantation of a compression hip screw (CHS) with an antirotation screw (n = 6) or a femoral neck plate (FNP) with three partially threaded screws (n = 6) in unfractured femurs (Eberle et al 2011).…”
“…In other words, three screws through the femoral neck stiffens the proximal femur on which a fractured, yet fixed femoral head fragment, shows increased elastic rotations when compared to the intact state. There are few publications presenting cortical strain data from femoral neck fracture experiments and such studies have often been performed in order to validate computer models (Eberle et al 2010, Peleg et al 2010). Eberle and colleagues measured cortical strain on the proximal femur in intact cadaver specimens and after implantation of a compression hip screw (CHS) with an antirotation screw (n = 6) or a femoral neck plate (FNP) with three partially threaded screws (n = 6) in unfractured femurs (Eberle et al 2011).…”
“…Strain gauges 3 and 4 are positioned at 134 mm for shaft lateral and 214 mm for shaft medial, respectively, from the femoral head. 30 The positions 1, 2, 3, and 4 were chosen, 28,29 where the probability of fracture in the femur bone is high. Figure 1.Actual position of the femur bone and strain gauges.…”
Humans face bone fracture when they unfortunately met an accident, which requires timely medical attention for healing and repairing the fractured bone; otherwise that paralyzes their life. 3D modeling technique with computational method is very helpful at the side of doctors for healing and repairing the damaged bones. Fractional bone healing is one of the natural processes, which regain the mechanical reliability of the bone to a limited level of failures. The relationship between the biology and mechanics has introduced a new branch namely biomechanics. Various biomechanics models were used to identify the fracture for different patients and helps in the fracture treatment. The aim of this work is to find out the high stress concentration area of the femur bone, which has been extracted as image from computer tomography scanner. The retrieved noise-free femur bone image is tested by the static load condition with the help of the finite element analysis. The result obtained from the testing of different loads has been compared with the existing literature. It is found that the femur bone has tensile and compressive stress, and the neck area of the femur is at a very high stress concentration. The outcome of this work is much supportive to orthopedic surgeons in femur surgery and bone prosthesis by avoiding experiments on femur bone.
“…The plan includes the screws --their lengths, diameters, locations, and number -- and the custom plates. The surgeon can produce more than one fixation plan, and perform further analysis and comparison with finite-element methods [23]. The preoperative plan is then exported for use during the surgery.…”
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