Fig. 8.

The effects of the anterior (left) and posterior approaches (right) are examined with various types of implants: hip resurfacing arthroplasty (HRA; red), dual mobility arthroplasty (DM-THA; blue), and conventional total hip arthroplasty (c-THA; black) after unrepaired (dashed) and repaired conditions (solid). The x axis denotes the testing positions, and the y axis denotes the internal-external rotation (positive-negative). The shaded green area dictates the measured range of native hip rotation. The larger head size of the hip resurfacing arthroplasty demonstrated a range of motion that was more similar to the intact condition. The posterior approach showed higher dislocation risks during deep flexion. The values are given as the mean, and the error bars indicate the standard deviation. Ext-Abd = extension and abduction, Flx-Add = flexion and adduction, and ROM = range of motion. (Reproduced, with permission, from: Logishetty K, van Arkel RJ, Ng KCG, Muirhead-Allwood SK, Cobb JP, Jeffers JRT. Hip capsule biomechanics after arthroplasty: the effect of implant, approach, and surgical repair. Bone Joint J. 2019 Apr;101-B(4):426-34. ©2019 The British Editorial Society of Bone & Joint Surgery).