Stabilographic features of standing in patients before and after the total hip replacement
Background. One of the methods for evaluating the outcomes of total hip replacement is stabilography. According to the exa
mination of patients after arthroplasty, standing disorders persist for 12–24 months. We associated these disorders with the inadequacy of the pelvic muscles due to the longexisting hip joint contracture prior to surgery. Materials and methods. We performed a statographic exa mination of 24 patients with coxarthrosis several days before and 9–12 months after the operation, after complete restoration of patients’ ability to walk. Two groups were studied: the first group consisted of patients whose postoperative global femoral offset decreased by more than 5 mm compared to baseline values. The second group included patients whose global femoral offset after surgery had not changed in comparison with the same parameters before surgery. The change in the coordinates of the common center of mass projection and the oscillation frequency were analyzed. Results. It was found that a decrease in the abductor arm length after surgery leads to a statistically significant change in the shape and area of displacement of common center of mass projection, and also to an increase in the speed and frequency of the oscillations of the common center of mass projection that indicates an increase in energy expenditure for maintaining the vertical posture. Conclusions. As the abductor arm length decreases after replacement, the energy expenditure of the muscles to maintain the patient’s erect posture increases. Consequently, energy exhaustion occurs more quickly, which is clinically manifested by symptoms of abductor mechanism failure.
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