Decrease in pelvic incidence after adult spinal deformity surgery is a predictive factor for progression of hip joint...

Area of Science:

• Orthopedics
• Spine Surgery
• Radiology

Background:

• Adult spinal deformity (ASD) often requires surgical correction.
• Spinal alignment correction can impact adjacent joints, including the hips.
• Understanding the relationship between spinal and hip health is crucial for long-term patient outcomes.

Purpose of the Study:

• To evaluate the association between spinopelvic alignment parameters and hip osteoarthritis (OA) progression.
• To focus on the changes in spinopelvic alignment from pre- to post-surgery.
• To identify factors predicting hip OA progression after spinal fusion.

Main Methods:

• Retrospective study of 100 adult spinal deformity patients (196 hip joints).
• Measurement of hip joint parameters (Acetabular Roof Obliquity, Center Edge Angle, Kellgren and Lawrence grade).
• Calculation of pre- to 1-month postoperative changes (Δ) in spinopelvic parameters; 5-year follow-up for OA progression.

Main Results:

• Age, Acetabular Roof Obliquity, and change in Pelvic Incidence (Δ PI) were associated with KL grade progression in all cases.
• In cases with initial KL grade 0, PI-LL, Δ PI, and Δ Cobb were significantly associated with progression.
• A decrease in Pelvic Incidence (Δ PI) was a significant predictor of hip OA progression.

Conclusions:

• Preoperative to postoperative changes in Pelvic Incidence (PI) significantly affect hip osteoarthritis progression after spinal fusion.
• A decrease in PI may suggest underlying sacroiliac joint laxity.
• Patients exhibiting this risk factor require vigilant monitoring for potential hip OA development.