Abstract
Aim: To explore an accurate method to calculate acetabular cup anteversion after total hip arthroplasty. Method: 1) A 3D coordinate system was established with the center of the hip joint rotation center base as coordinate center. The acetabular exit plane and Pettersson formula acetabular anteversion and Riten Pradhan formula acetabular anteversion and acetabular true anteversion were drawn; 2) Determine the mathematical expression of Pettersson formula acetabular anteversion α and Riten Pradhan formula acetabular anteversion β in the coordinate system. The true acetabular anteversion is projection angle of Pettersson formula acetabular anteversion α on cross-section in the presence of acetabular abduction δ, determining mathematical expression of the acetabular anteversion θ by trigonometric functions. Results: Real acetabular cup anteversion θ = arctg (tgβ/cosδ). Conclusion: The true acetabular cup anteversion and Pettersson formula anteversion and Riten Pradhan for mula anteversion were quite different. The difference was increased with the acetabular cup abduction angle increased. The formula was simple and accurate and worthy of clinical reference.
Highlights
Good acetabular cup anteversion and abduction were the basis of prosthesis stability, which was a key of a successful operation
Bad position of acetabular prosthesis leads to prosthesis loose which could lead to femoral head prosthesis prolapse [1,2,3]
Acetabular prosthesis included cement and non-cemented: the former was with a metal ring at the edge of the cup oval in hip anteroposterior X-ray films, the latter could only be seen a metal arc, elliptical arc, the middle part was blocked by the femoral head prosthesis
Summary
Good acetabular cup anteversion and abduction were the basis of prosthesis stability, which was a key of a successful operation. Acetabular prosthesis included cement and non-cemented: the former was with a metal ring at the edge of the cup oval in hip anteroposterior X-ray films, the latter could only be seen a metal arc, elliptical arc, the middle part was blocked by the femoral head prosthesis. Due to the difficulty in measuring acetabular cup anteversion, Pettersson formula acetabular cup anteversion [4] and Riten Pradhan formula acetabular cup anteversion [5] were not corresponding to theory, so we determined a mathematical formula of theoretical acetabular anteversion by establishing a three-dimensional coordinate system.
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