<prompt> Osteoporosis is characterized most commonly by -a Fracture vertebrab Backache c Bowing of legsd Abdominal painabaadbc  <response>: Clinical features of osteoporosis Osteoporosis is an asymptomatic disorder unless complications predominantly fractures occur.Most common symptom of osteoporosis is back pain secondary to vertebral compression fracture.Dorso-lumbar spine is the most frequent site.Other common sites of fracture are lower end radius Colles fracture and fracture neck femur. 