Gait Parameter on an Osseointegrated Prosthesis with Altered Height and Coefficient of Friction

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Kunz, Timothy
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Osseointegrated implants have many advantages including a more secure interface between the residual limb and prosthesis, load transmission directly through the bone, increased range of motion, lack of skin-socket interaction issues, and increased osseoperception. To address the longstanding issue of high infection rates at the skin-implant interface, a novel porous titanium osseointegrated fixture has been developed and is being tested in animal models. Not much is understood about the proper alignment of prostheses in animals. The purpose of this study was to examine the effects of the overall height and coefficient of friction (COF) of the prosthesis on specific gait characteristics. Two hypotheses were tested: 1. The height of the prosthesis would affect the magnitude of the resultant flexion moment at the knee and extension moment at the hip. The prosthesis will have a specific height at which the moments will peak due to a biomechanical advantage. 2. As the coefficient of friction between the prosthesis and floor was increased, the subject will decrease the normal force and increase the shear forces. One cat, fit with a J-shaped osseointegrated prosthetic implant, walked along a walkway while collecting kinematic and force plate data. Five different prosthetic heights (Omm, 3mm, 6mm, 9mm, 12mm) and two frictional materials with different COF (1.17, 1.25) were examined. A two-way ANOVA analysis revealed significant effect (p<O.05) of the prosthesis height on the resultant knee moment and the COF on the shear forces. No significant effect of the prosthesis height on the moment produced at the hip or of the COF on normal forces was found. The relationship of the resultant knee moment and the height of the prosthesis was bell shaped, supporting hypothesis #1 and identifying the optimal biomechanical height of the prosthesis. A similar relationship that was not significant was found at the hip joint. A non-significant increase in normal forces when decreasing in the COF was found. A broader range in the materials' COF may have resulted in significant results. A significant decrease in the shear forces as the COF increased contradicted hypothesis #2. This could be due to the higher COF being tested second and the subject becoming used to wearing a prosthesis
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Masters Project
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