DYNAMIC ACETABULAR CUP VERSION IN TOTAL HIP ARTHROPLASTY PATIENTS

Vasiljeva K, Lunn D, Chapman G, et al. DYNAMIC ACETABULAR CUP VERSION IN TOTAL HIP ARTHROPLASTY PATIENTS. Orthop Procs. 2021;103-B(SUPP_2):38-38. doi:10.1302/1358-992X.2021.2.038

Vasiljeva, Ksenija, et al. “DYNAMIC ACETABULAR CUP VERSION IN TOTAL HIP ARTHROPLASTY PATIENTS.” Orthopaedic Proceedings, vol. 103-B, no. SUPP_2, 2021, pp. 38-38., https://doi.org/10.1302/1358-992X.2021.2.038

Vasiljeva, K., Lunn, D., Chapman, G., Redmond, A., Wang, L., Thompson, J., Williams, S., Wilcox, R., & Jones, A. (2021). DYNAMIC ACETABULAR CUP VERSION IN TOTAL HIP ARTHROPLASTY PATIENTS. Orthopaedic Proceedings, 103-B(SUPP_2), 38-38. https://doi.org/10.1302/1358-992X.2021.2.038

Vasiljeva, K., Lunn, D., Chapman, G., Redmond, A., Wang, L., Thompson, J. et al. (2021) “DYNAMIC ACETABULAR CUP VERSION IN TOTAL HIP ARTHROPLASTY PATIENTS.” Orthopaedic Proceedings, 103-B(SUPP_2), pp. 38-38. Available at: https://doi.org/10.1302/1358-992X.2021.2.038

Vasiljeva, Ksenija, David Lunn, Graham Chapman, Anthony Redmond, Lin Wang, Jonathan Thompson, Sophie Williams, Ruth Wilcox, and Alison Jones. “DYNAMIC ACETABULAR CUP VERSION IN TOTAL HIP ARTHROPLASTY PATIENTS.” Orthopaedic Proceedings 103-B, no. SUPP_2 (2021): 38-38. https://doi.org/10.1302/1358-992X.2021.2.038

Vasiljeva K, Lunn D, Chapman G, Redmond A, Wang L, Thompson J, et al. DYNAMIC ACETABULAR CUP VERSION IN TOTAL HIP ARTHROPLASTY PATIENTS. Orthop Procs. 2021 Mar 1;103-B(SUPP_2):38-38. https://doi.org/10.1302/1358-992X.2021.2.038

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Abstract

Objectives

The importance of cup position on the performance of total hip replacements (THR) has been demonstrated in in vitro hip simulator tests and clinically. However, how cup position changes during gait has not been considered and may affect failure scenarios. The aim of this study was to assess dynamic cup version using gait data.

Methods

Pelvic movement data for walking for 39 unilateral THR patients was acquired (Leeds Biomedical Research Centre). Patient's elected walking speed was used to group patients into high- and low-functioning (mean speed, 1.36(SD 0.09)ms⁻¹ and 0.85(SD 0.08)ms⁻¹ respectively). A computational algorithm (Python3.7) was developed to calculate cup version during gait cycle. Inputs were pelvic angles and initial cup orientation (assumed to be 45° inclination and 7° version, anterior pelvic plane was parallel to radiological frontal plane). Outputs were cup version angles during a gait cycle (101 measurements/cycle). Minimum, maximum and average cup version during gait cycle were measured for each patient. Two-sample t-test (p=0.05) was used to compare groups.

Results

Over a gait cycle the mean minimum, maximum and average version angles for the high-functioning group were −4.5(SD 4.4)°, 5.0(SD 4.3)°, 9.5(SD 4.0)° and for low-functioning group 2.0(SD 3.7)°, 6.2(SD 2.9)°, 8.1(SD 3.2)°. There were no significant differences for the minimum, maximum and average version angles between the two groups.

Conclusions

The study shows that dynamic acetabular cup version changes substantially during gait and this must be considered clinically and in pre-clinical testing. There was no significant difference between the two groups; however, dynamic cup version was more negative in high-functioning compared to low-functioning patients. Further studies on a larger cohort are required to determine whether patients’ profiles can be stratified to provide enhanced inputs for pre-clinical THR testing.

Declaration of Interest

(b) declare that there is no conflict of interest that could be perceived as prejudicing the impartiality of the research reported:I declare that there is no conflict of interest that could be perceived as prejudicing the impartiality of the research project.