Global, acetabular and femoral offset restoration after total hip arthroplasty with conventional and dual mobility prostheses

Background: Restoration of anatomical parameters is crucial for ensuring proper function and longevity of components in Total Hip Arthroplasty (THA).Objective: To radiographically assess the restoration of the global offset (GO), acetabular offset (AO) and femoral offset (FO) with conventional prosthesis (CP) and dual mobility (DM) prosthesis.Methods: An Ambispective, comparative and cross-sectional study was conducted from March 2022 to March 2024.GO, FO and AO were measured using postoperative anteroposterior pelvis radiographs, comparing the operated hip to the contralateral side in patients who underwent THA with CP and DM prostheses at an Orthopedic Hospital in Mexico.Results: 42 patients were included, divided into 2 groups: 18 in the dual mobility group and 24 in the conventional prosthesis group.In the CP group, 12 patients had a ≤ 32 mm femoral head and 12 had a 36 mm femoral head.FO was restored in 22.2% of DM patients and 41% of CP patients (p = 0.185).AO was restored in 50% of DM group and 83.3% of CP group (p = 0.020).GO was restored in 66.6% of DM group and 50% of CP group (p = 0.280).A significant difference in AO restoration was observed between femoral head diameters, with 100% restoration in CP with 36 mm femoral head diameter (p = 0.015).Conclusions: Anatomical offset restoration is achievable with both types of prostheses; however, this study established a significant advantage in acetabular offset restoration using conventional prosthesis with a 36 mm femoral head diameter.