Good vs Poor Results After Total Hip Arthroplasty: An Analysis Method Using Implant and Anatomic Parameters With the EOS Imaging System.
Existing imaging techniques and single-parameter analyses, in nonfunctional positions, fail to detect the differences between patients with good vs poor results after total hip arthroplasty.



The present study developed an analysis method using the EOS full-body, low-dose, biplanar, weightbearing imaging system to compare good vs poor patients after total hip arthroplasty and to report on our preliminary experiences (17 good, 18 poor).



All revision cases were found to have at least 4 high or low implant or anatomic parameters relative to the good group. These included acetabular cup orientation, sagittal pelvic tilt, sacral slope, femoral offset, and neck-shaft angle. Acetabular cup orientation differed significantly between groups.



With the EOS system, a large cohort can be studied relatively quickly and at low dose, which could lead to patient-specific guidelines.
Institut de Biomécanique Humaine Georges Charpak, Arts et Métiers ParisTech, Paris, France; Hôpital Rothschild AP-HP, Paris, France.
Samy
S
Bendaya
Institut de Biomécanique Humaine Georges Charpak, Arts et Métiers ParisTech, Paris, France; Biomedical Engineering Civil Engineering, and McCaig Institute for Bone and Joint Health, University of Calgary, Calgary, Canada.
Carolyn
C
Anglin
Institut de Biomécanique Humaine Georges Charpak, Arts et Métiers ParisTech, Paris, France; Departments of Orthopaedics and Anatomy, Hôpital Universitaire Pitié-Salpêtrière, UPMC, Paris, France.
Jean-Yves
JY
Lazennec
Institut de Biomécanique Humaine Georges Charpak, Arts et Métiers ParisTech, Paris, France.
Rachele
R
Allena
Hôpital Rothschild AP-HP, Paris, France.
Philippe
P
Thoumie
Institut de Biomécanique Humaine Georges Charpak, Arts et Métiers ParisTech, Paris, France.
Wafa
W
Skalli
D000077:Acetabulum / Q000601:surgery*; D000368:Aged; D019644:Arthroplasty, Replacement, Hip / Q000379:methods*; D005260:Female; D005269:Femur / Q000601:surgery*; D006622:Hip Prosthesis; D006801:Humans; D007091:Image Processing, Computer-Assisted; D008297:Male; D008875:Middle Aged; D015203:Reproducibility of Results; D016896:Treatment Outcome
EOS system; THA; functional outcome; imaging; total hip arthroplasty