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junction and pelvic tilt >25°; pelvic incidence–lumber lordosis >10°); rigid and unbalanced (rigid spinopelvic junction and PT >25°; PI–LL >10°). The four categories in Hip–Spine Classification are: 1A (normal alignment; normal mobility): in this type of

influence of spinopelvic mobility and the acetabular component inclination and anteversion for THA. 41 , 42 Movement from standing to sitting is accompanied by posterior tilt of the pelvis, thus enabling the acetabulum to open for clearance of the hip

. Stefl M Lundergan W Heckmann N . Spinopelvic mobility and acetabular component position for total hip arthroplasty . Bone Joint J 2017 ; 99-B ( suppl A ): 37 - 45 . 19. Bedard NA Martin CT Slaven

the spatial position of the hip influenced by functional pelvic and femur motion; the new concept of functional stability. 57 In patients with low spino-pelvic mobility, the acetabular component requires more coronal inclination and anteversion

studies have demonstrated a significantly higher risk for dislocation in patients with abnormal spinopelvic characteristics ( 25 , 38 , 39 ). Spinopelvic mobility describes the interaction of the lumbar spine, the pelvis and hip joint, whereas these

, pelvic tilt; SVA, sacral vertical axis; TPA, T1-pelvic angle. Source : Taken from Lafage R, Schwab F, Challier V, et al. Defining spino-pelvic alignment thresholds: should operative goals in adult spinal deformity surgery account for age? SPINE

replacement for patients with ankylosing spondylitis . J Arthroplasty 2015 ; 30 : 2219 - 23 . 59. Stefl M Lundergan W Heckmann N . Spinopelvic mobility and acetabular component position for total hip arthroplasty . Bone

, and so this article will use the term ‘mobility/movement’ to describe a dynamic spondylolisthesis where possible. Patient factors Factors such as patient age, sex, occupation, body mass index and clinical symptoms have been found to correlate

observe a loss of mobility at long-term follow-up with dynamic stabilization; therefore, the advantage at long-term follow-up seems theoretical. Another advantage of fusion is to prevent occurrence of articular cysts; 30 indeed, several authors

must be taken into account when planning total hip arthroplasty. Spinal deformity and abnormal pelvic mobility have been associated with an increased risk of instability, dislocation and revision ( 32 ), and as such, patients with suspected spino-pelvic