Figure 2From: Relationship between cup position and obturator externus muscle in total hip arthroplastyExample illustration of the spatial relation as shown in the MRI images between the obturator externus muscle and the acetabular component. Group 1 shows no contact between the obturator externus muscle and the acetabulum, group 2 shows slight contact, and group 3 shows a displacement of the obturator externus muscle in its course.Back to article page