Clinical Features of Osteoroposis The vast majority of hip fractures occur after a fall. about 5% appear to be spontaneous fractures, in which the patient feels a fracture and then falls Overall about half of hip fractures are intertrochanteric and the others are femoral neck fracturesClinical Features of Osteoroposis The vast majority of hip fractures occur after a fall. About 5% appear to be “spontaneous” fractures, in which the patient feels a fracture and then falls. Overall about half of hip fractures are intertrochanteric and the others are femoral neck fractures