I had an old calcanea stress fracture with swelling. can long-term foot instability, plantar fasciitis, sural neuropathy cause back problems?

Yes: Your foot issues affect how you walk and may well result in foot contact with the floor at an abnormal angle. Stress can be transmitted to knees, hips, or lower back resulting in strain patterns. See your podiatrist and see if orthotics or braces may help.

Heel fracture: The answer is simply yes. Long term instability, plantar faciitis, and sural neuropathy...All cause pain. And, trying to ambulate through it, will cause you to limp. This limping will effect your back.. See a specialist, and get help.