Highly cross-linked versus conventional polyethylene inserts in total hip arthroplasty, a five-year Roentgen stereophotogrammetric analysis randomised controlled trial

Figure 1 Model of Roentgen stereophotogrammetric analysis technique. Model of Roentgen stereophotogrammetric analysis technique on right-sided acetabular component after insertion of tantalum markers, by measuring the penetration of the head in the proximal-distal (A-axis), medial-lateral (B-axis) and anterior-posterior migration (C-axis) direction.

Figure 2 Flow chart of follow-up. PE: Polyethylene; RSA: Roentgen stereophotogrammetric analysis.

Figure 3 Wear of the inlay in the medial direction in mm over time (months).

Figure 4 Wear of the inlay in the proximal direction in mm over time (months).

Figure 5 Volumetric wear of the inlay in mm³ over time (months).

Figure 6 Corrected volumetric wear of the inlay in mm³ over time (months).