Technical note for intraoperative determination of proper acetabular cup size in primary total hip arthroplasty

Figure 1 The defined acetabular size indicator reamer, not entering into the acetabulum cavity without cutting bone first.

Figure 2 The acetabulum with bone reamers. A: Typical cotyloid cavity preparation with successive reaming; B: The acetabular size indicator reamer (ASIR); C: Providing the size of the acetabular component to implant. Black arrow indicates ASIR’s position in the whole reaming procedure.

Figure 3 Coefficient correlation illustration depicting positive covariance.

Figure 4 Correlation between. A: Acetabular size indicator reamer; B: Acetabular templating; C: Acetabular shell implanted.