BACKGROUND: Prior studies have shown that aberrant lumbopelvic coordination (LPC) patterns could indirectly suggest alterations in neuromuscular control of trunk motion as well as altered lumbar joint loading. The effects of low back pain (LBP) on LPC have been previously studied yet despite the high incidence of LBP in those with hip-related pain (60%), the combined impact of LBP and hip pain (i.e. spine hip syndrome) on LPC is not well understood. Thus, the main objective of this study is to assess the LPC during a lumbar flexion/extension task in subjects with no hip pain, hip pain and concomitant LBP and hip pain. It is expected that this study will provide insight into the LPC that is associated with combined hip pain and LBP and will aid in developing interventions to optimize LPC to reduce LBP in people with concomitant hip and low back pain. METHODS: The data used in this study will consist of adults with no prior history of spinal or lower extremity surgery, BMI < 35 kg·m-2 and will be derived from our current on-going research studies. These adults will be divided into three groups: 1) asymptomatic, healthy controls 2) hip pain 3) LBP and hip pain. The presence of hip pain and LBP will be self-reported by each participant and the Hip disability and Osteoarthritis Outcome Score (HOOS) survey and the self-report Numeric Rating Scale will be used to assess severity of hip and low back pain, respectively. A 3D gait analysis was performed of each participant while performing seven continuous repetitions of trunk flexion and extension at a self-selected speed while keeping their legs extended. A custom written MATLAB algorithm will be developed and used to assess peak thoracic, pelvic, and lumbar angles, thoracic, pelvic and lumbar range of motion and the lumbar-thoracic ratio (peak thoracic - peak pelvic/peak thoracic) measure. An ANOVA, with necessary adjustments for covariates, will be used to assess between-group differences in biomechanical outcomes with α=0.05 and multiple testing corrections performed as needed. ANTICIPATED RESULTS: It is hypothesized that the participants with hip pain and concomitant hip pain and LBP will exhibit altered LPC patterns compared to the control group. These data will help clinicians understand the potential role of the lumbar spine in development of LBP in those with hip pain and aid in developing interventions to treat people with hip-spine syndrome.

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