Abstract Objective To investigate whether the body mass index (BMI) will affect the implantation and complications of the direct anterior approach (DAA).Methods The data of 145 patients who underwent DAA unilateral total hip arthroplasty in our department from June 2019 to January 2021 was retrospectively analyzed.All patients were divided into 4 groups according to the Chinese BMI classification.Low body weight:BMI<18 kg/m2;normal body reconstitution:18.5 kg/m2≤BMI<24 kg/m2;super recombination:24 kg/m2≤BMI<28 kg/m2;obesity group:BMI≥28 kg/m2.There were 17 cases of low body recombination,11 males and 6 females.Theage ranged from 51 to 65 years,with an average of 54 years old.There were 48 cases of normal body reorganization,25 males and 23 females.The age ranged from 49 to 64 years,with an average of 56 years old.There were 56 cases of overweight,including 36 males and 20 females.They were 48~62 years old,with an average of 57 years old.There were 24 cases in the obesity group,including 14 males and 10 females.The age ranged from 52 to 60 years,with an average of 53 years.The imaging evaluation indexes of prosthesis implantation,operation status and early complications at 3 months after operation were compared among the groups.Results In the case of prosthesis implantation,the average anteversion angle of all patients was 20.10°.With the increase of BMI,the anteversion angle of the acetabular prosthesis gradually increased among the groups,and the differences between the groups were significant(P<0.05),but 97.24% of the acetabular anteversion angle was within the safe zone.Comparison between the acetabular prosthesis's external abduction angle,femoral prosthesis's internal valgus angle,eccentricity change,and the length of both lower limbs showed no statistically significant difference (P>0.05).Patients in the obesity group had longer operation time and incision length,and the difference between the groups was statistically significant (P<0.05).A total of 5 patients in all cohorts had intraoperative fractures.3 patients had delayed incision healing.There were no dislocations and deep infections.Surgical blood loss and visual analogue scale(VAS) on the third day after surgery showed no difference(P>0.05).There was no significant difference in intraoperative and early postoperative complications (P>0.05).Conclusion When obese patients undergo DAA total hip arthroplasty,the difficulty of the operation increases,and the anteversion angle of the acetabular prosthesis tends to be larger,but the safety of the prosthesis implantation will not be reduced.DAA is a safe and reliable operation methodfor non-morbidly obese patients.
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