The app approximate true biomechanical conditions in hip as realistically as possible Now we are able to predict the biomechanical effect on load and pressure of an operative procedure by computational means.Load determinations in the literature are based essentially on the load model developed by Pauwels in 1935
The model described by Legal et al. which is based on a uniform stress distribution and the calculation of maximum pressure during one leg stance in walking, without involving complicated mathematics and physics, for evaluating the biomechanical efficacy of current standard operations, and for the explicit calculation of prevailing joint pressure in the individual case which has been used in app.
Tonnis presented the whole method for extracting from simple geometric parameters from a standard AP pelvic radiographs of a complete biomechanical evaluation of patient hip and in his book and presented in 1987 in order to measure pressure and load in patient hip. This procedure has been in time forgotten , but after thorough study and taking advantage of computational power of iPhone and iPad and the unique power of X-code which allow us to calculate complex equations has make this sound biomechanical study- concept now available in simple iPhone in a sec to compute very complex and difficult equations by clicking few points in screen As far as we know nothing is attempt like.
Human hip is a biologic system that obeys purely mechanical laws. The main concern of the orthopedic surgeon especially those treating the dysplatic hip is to improve the biomechanical status of the joint. To accomplish this, the surgeon must be familiar with the biomechanics of the hip. Because of the complexity of biomechanical analysis (trigonometric functions, etc.) is almost impossible to calculate in everyday settings, forces acting on the hip, the directions in which they act, and the associated stresses that develop within the joint. With measurements by the App and having numerical data it is possible to evaluate the efficacy or even predict it of the various procedures not on the basis of experience any more.
The Hip Biomechanics App is medical software aimed for orthopaedic surgeons, providing tools that allow doctors to:
-Securely import medical images directly from the camera or stored photos.
-By marking certain points in a simple standard AP pelvic radiograph, geometric parameters are being calculated. The App computes weight-bearing contact surface, the load (R) and stress (P) on the measured hip.
Data from load and pressure distribution in the hip - like in a real biomechanicals tests- are being measured and depicted graphically as vectors over the X-ray in the screen over the joint. The distribution also of compressive stresses over the acetabulum, which is usually associated radiographic sclerosis over the acetabular margin, are printed in real time over the screen and thus can be easily and objectively evaluated. Besides that, the App provides data in export for diagrams of load (R) pressure (P), which each can be plotted as a curve allowing easy comparison with normal data and thus help decide the orthopaedic surgeon which procedure is objectively indicated.
-The data are printed over to screen so each case can easily assessed
-Save the planned images, for later review or consultation. Data are exported as txt file, ready to print or to input as cells to numbers or excel ready for chart printing and further research.
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