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Abstract Objective To analyze and investigate the optimal hip knee ankle(HKA) angle correction rate in the treatment of knee osteoarthritis(KOA) by high tibial osteotomy(HTO) for clinical treatment.Methods A total of 89 patients with KOA treated with HTO who met the inclusion criteria were analyzed，including 35 males and 54 females.The patients age ranged from 38 to 68 years，with an average of (55.10±6.54)years.The Oxford knee score(OKS) was used to score the patients before surgery，3 months after surgery and 1 year after surgery，and the patients’ preoperative and postoperative HKA angles were measured.The ratio of the correction of HKA angle in HTO (the absolute value of the difference between the postoperative HKA angle and the preoperative HKA angle，the amount of change in the HKA angle caused by the surgery) to the preoperative HKA angle was defined as the correction rate of the HKA angle (hereinafter referred to as the correction rate).The relationship between the correction rate and the surgical outcome (measured as the difference between the preoperative OKS score and the postoperative score) was investigated by presetting a number of hypothetical ideal correction rates and analyzing them in comparison with the actual postoperative correction rates achieved by each patient.Results The deviation of a patient’s actual postoperative correction rate from some preset values of the presumed hypothetical ideal correction rate (the absolute value of the difference between the two) was negatively correlated with surgical outcome.This was reflected in the fact that the ideal correction rate (corresponding to the smallest P value) was about 1.1 to 1.2 at 3 months postoperatively and 1.2 at 1 year postoperatively，which mean that a reasonable amount of surgical correction should be about 1.2 times the preoperative knee HKA varus angle to achieve a mildly valgus knee HKA angle after surgery.Conclusion Using 1.2 as the target value of HTO correction rate，which means the amount of intraoperative correction of HTO is 1.2 times of the patient’s preoperative HKA varus angle value，a better surgical result can be achieved，and this conclusion can provide a reference for the preoperative planning of HTO.
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Corresponding Authors:
Cui Weiding
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