May Be Caused by

 Common

Osteomalacia

Paget disease of bone

Rickets

 Uncommon

Bone graft donor site

Cushing syndrome

Hyperphosphatasia

Hypophosphatasia

Idiopathic pseudofracture

Leprosy

Neuropathic disorder

Osteogenesis imperfecta

Osteopetrosis

Osteoporosis

Polyostotic fibrous dysplasia

Pyknodysostosis

Radiation osteitis

Renal osteodystrophy

Rheumatoid arthritis

Steroid medication

Surgery