Compared with PA, DAA can improve bone mineral density and postoperative gait recovery：Retrospective study

Background To investigate the difference of bone mineral density and gait in patients with direct anterior approach and posterior approach after total hip arthroplasty was compared, and the correlation between bone density and gait was observed. Methods A total of 76 patients diagnosed with femoral head necrosis and completed the first unilateral total hip arthroplasty from October 2021 to March 2022 were enrolled as the study subjects, and were divided into two groups according to different surgical methods. The gait indexes and bone density in Gruen1 and 7 regions were analyzed retrospectively. Results Gait indexes of DAA group and PA group were significantly improvedmafter surgery compared with those before surgery; bone mineral density (BMI) at 1 month and 3 months after surgery in Gruen1 area was significantly improved compared with that in 1 week after surgery. Stride length, stride speed, stride frequency, percentage of single support phase of affected limb to gait cycle, hip motion and BMI at 1 month and 3 months after surgery in DAA group were all better than those in posterior approach group, and the differences were statistically significant (P < 0.05); there was a positive correlation between the gait indexes and BMI at 1 month and 3 months after operation in both the anterior and posterior approach groups (r > 0 ,P < 0.05). Conclusion Total Hip Arthroplasty(THA) with DAA has certain advantages in the postoperative functional rehabilitation of patients, which can improve the bone density of patients and improve the postoperative gait recovery of patients.