Determination of Leg Alignment in Hip Osteoarthritis Patients with the EOS® System and the Effect on External Joint Moments during Gait

Abstract

The present study considered the entire leg alignment and links static parameters to the external joint moments during gait in patients with hip osteoarthritis. Eighteen patients with unilateral hip osteoarthritis were measured using the EOS® system. Clinical leg alignment and femoral parameters were extracted from the 3D reconstruction of the EOS images. A 3D gait analysis was performed and external knee and hip adduction moments were computed and compared to 18 healthy controls in the same age group. The knee adduction moments of the involved leg were strongly correlated to the femoral offset and the varus/valgus alignment. These parameters alone explained over 50% of the variance in the knee adduction moments. Adding the pelvic drop of the contralateral side increased the model of femoral offset and varus/valgus alignment and explained 78% of the knee adduction moment during the first half of the stance. The hip adduction moments were best associated with the hip kinematics and not the leg alignment.

Identification of Patients with Similar Gait Compensating Strategies Due to Unilateral Hip Osteoarthritis and the Effect of Total Hip Replacement: A Secondary Analysis

“…In this secondary analysis, data of patients who participated in previous prospective studies in our clinic were analyzed [ 7 , 28 , 29 , 30 ]. Furthermore, data from all healthy controls with a similar age distribution who were present in our database were used for comparison.…”

Lower limb joint loading in patients with unilateral hip osteoarthritis during bipedal stance and the effect of total hip replacement

“…In the present study, data from patients who had participated in previous prospective studies in our clinic were analyzed (Schmidt et al, 2017;Stief et al, 2018;van Drongelen et al, 2019;van Drongelen et al, 2020). In these studies, gait analysis and radiography were performed preoperatively and 1 year after THR.…”

Variation in Sagittal Alignment Parameters in Adult Patients before Spine Surgery: A Serial Imaging Study Using Antero-Posterior and Latero-Lateral Projections

“…Unlike conventional radiography systems, EOS images do not cause distortions between the center and edges of the radiograph, because linear X-ray sources and detector arrays move together [6]. This full-body EOS enables evaluation of the global alignment of the spine, pelvis, and lower limbs, which is important in diagnosing spinal deformity and surgical outcomes [7][8][9][10][11]. Hence, EOS images are increasingly becoming routine before spine surgery [12].…”