Abstract:Objective To investigate whether correction angles lost over time after medial open-wedge high tibial osteotomy (OWHTO) and to determine which factors are related.Methods A total of 40 patients (45 knees) with OWHTO at Hospital of Traditional Chinese Medicine Affiliated to Xinjiang Medical University from May 2018 to October 2020 were retrospectively reviewed,including 15 males and 25 females.The average age was (55.40±11.86) years.We measured the hipknee-ankle angle (HKA),medial proximal tibial angle(MPTA),joint line convergence angle(JLCA),posterior tibial slope(PTS) and Caton index before,after,and 1 year after surgery.The scores of Western ontario and McMaster universities osteoarthritis index(WOMAC) and American knee society(AKS) of patients before and 1 year after surgery were compared.Results All patients were followed up for 13 to 28 months,with an average of (18.7 ± 7.54) months.HKA was corrected from (-8±3.17) ° before surgery to (2.56±2.61) ° 3 days after surgery,and (1.66±2.89) ° 1 year after surgery.There were significant differences in preoperative,postoperative 3 days and 1 year after surgery (P<0.05).JLCA ranged from (2.54±1.43) ° preoperatively to (2.54±1.94) ° 3 days after surgery,and (2.38±1.60) ° 1 year after surgery.PTS ranged from (7.81±5.05) ° preoperatively to (6.98±4.71) ° 3 days after surgery,and (8.34±4.83) ° 1 year after surgery.The difference between the JLCA and PTS groups was not considered statistically significant (P>0.05).Compared with 1 year after operation,HKA changed more than 1 ° as the boundary,they were divided into change group and unchanged group.There was no significant difference in preoperative JLCA and postoperative PTS between groups (P>0.05).Conclusion About 49% of OWHTO cases show a loss of correction angle >1° at 1 year follow-up,but no associated influencing factors has been found.
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