The effect of asymmetrical limited hip flexion on seating posture, scoliosis and windswept hip distortion.

Ágústsson et al. (2017) looked at adults with cerebral palsy. They checked hip flexion range and scored seated posture, scoliosis, and windswept hips.

The team asked: Does one hip that bends less than 90° raise the odds of trunk and pelvic tilt? They used odds ratios to find the answer.

Adults with one hip that flexes less than 90° had much higher odds of pelvic tilt, trunk lean, scoliosis, and windswept hips.

In plain words, a tight hip on one side is a red flag for seated asymmetry and spine curve in this group.

Angsupaisal et al. (2017) extends this idea to kids. They showed a 15° forward seat tilt helps children with unilateral CP reach better yet hurts kids with bilateral CP. Together the papers say hip and seat angles matter at every age, so prescriptions must fit the child.

Bigham et al. (2013) seems to disagree at first. They found weak hip abductors only slightly tip the trunk while the pelvis stays level. The difference is impairment type: abductor weakness versus a hard flexion contracture. A tight hip flexor pulls the whole side down; a weak abductor does not.

Heyrman et al. (2014) adds that poor seated trunk control itself drives gait trunk sway. Their result lines up with Atli: if the hip is tight and the trunk is weak, both seated and walking postures suffer.

Check hip flexion every six months for adults with CP. If one side is under 90°, plan seating trials, stretching, and possible referral before scoliosis sets in. A quick goniometer reading today can save a spine surgery tomorrow.