At last an explanation
I have asked many docs over the years about the back pain radiating out to hips along pelvis when walking /. Adults with CP who walk tend to have excessive pelvic tilt and a larger range of lumbar rotation during gait, which is likely to contribute to or possibly exacerbate low back pain, potentially leading to lumbar spondylolysis (Harada ppppppet al. 1993; Opheim et al. 2011). The accumulating toll of weight bearing on joints with abnormal alignment, including cavus feet, knee deformities and displaced hips can in the long term also lead to the onset of pain in the affected joints during ambulation.