The authors have proposed an addition to the clinical classification of posttraumatic instability of the knee joint, based upon the complex clinico-physiologic evaluation of functional state of a joint as a single system. According to the degree of expression of morpho-functional changes there have been singled out compensated, subcompensated and decompensated forms of posttraumatic instability. Singling out of the given forms orients the physician in selection of tactics of carrying out of pre- and postoperative periods, helps a surgeon to solve the problem of optimal plan of operative treatment.
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