AN INDIVIDUALIZED WEIGHT-BEARING LOAD CALCULATION ALGORITHM USING THE K*j PERSONAL CORRECTION COEFFICIENT AFTER PRIMARY TOTAL HIP

Resume. This article describes an original algorithm for the individualized calculation and monitoring of weight-bearing load on the operated limb after primary total hip arthroplasty (THA). The algorithm is based on a personal correction coefficient, K*j, which integrates biomechanical (Ka, Kf, ηa), clinical (nosological form, muscle hypotrophy, contracture), and technical (fixation method of prosthetic components) predictors: allowed load (AL) = base load capacity (BLC) × correction coefficient (K*j). In a prospective controlled study of 230 patients (main group, n=122; control group, n=108), individual K*j values ranged from 0.847 to 0.970, demonstrating that a single standard loading regimen cannot be applied uniformly to all patients. Application of the algorithm shortened the time to discontinuation of crutches from 9.1±2.2 to 7.3±1.8 weeks (p<0.001) and of a cane from 21.6±3.1 to 16.2±2.4 weeks (p<0.001), without a significant increase in mechanical complications (3.7% vs. 2.5%; p>0.05). The algorithm requires no expensive equipment and can be implemented using a standard four-field platform scale. Keywords: total hip arthroplasty, weight-bearing load, individual correction coefficient, biomechanical monitoring, rehabilitation algorithm

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