Determining the three-dimensional position of the acetabular cup in total hip arthroplasty patients

Raul Marcel Casagrande, Anderson Evaristo da Silva, Claudio Novelli, Eduardo G Machado, Fabio S. F. Vieira, Fernanda T. Costa, Gustavo Celestino Martins, Heleise F.R. Oliveira, Kelmerson H. Buck, Leandro B. Camargo, Rafaella Vilela B. Casagrande, Thiago Campostrini, Valter R. Moraes, Guanis de Barros Vilela Junior


The total hip arthroplasty (THA) stands as one of the best well succeded orthopedic procedures. Despite of that, hip surgery domain still faces challenges on a regular basis. The positioning of THA components related to femur and pelvis is important for the surgery prognostic. Assessing both acetabular incline and anteversion angles during surgical programming will benefit THA procedure. Objectives: To evaluate the positioning of acetabular angles in ATQ, measuring its inclination and anteversion. To compare the results with previous studies of literature. Methods: By Shapiro Wilk and Bartlett tests were found normality and homogeneity of the variances. The t test was used to compare the findings with values found in literature. Thirty six male subjects who underwent THA were assessed through pelvis radiographies (AP), where the acetabular incline and anteversion angles have been trigonometric calculated. Results: 36 male subjects THA, being 61% of those on the left side of the body. The averages were, age 66.96 years (±12.24), acetabular cup incline 44.69º (± 4.65), acetabular anteversion angle 20.12º (±7.01). There were no statistically significant differences when compared to the reference values from literature. Conclusion: further studies and technologies must be adopted due to minimize the effects of any subjectivity in the acetabular component positioning, mainly when related to the acetabular anteversion.


Biomechanics; Orthopedics; Hip

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