Hi, thanks for writing to HCM. You have mentioned about the MRI
findings but not about your mothers symptoms. Generally, symptoms arising from the hip are localised to groin in the front and gluteal region in the back by way of having pain in those areas. Whereas pain due to spinal problem will originate in the midline of lower back and continue down along hip, thigh,knee,ankle and toes especially along the posterior part of leg.
So, its always wise to rule out any pathology in the hip prior to planning any surgery on the spine. Hope this helps