Risk factors for second hip fracture in elderly patients: an age, sex, and fracture type matched case-control study.

The incidence of second hip fracture was not low. Although survival rates did not differ between the patients with or without second hip fracture, walking ability of patients with second hip fracture worsened. Dementia and cardiac disease could be risk factors for second hip fracture in elderly patients, and valvular disease might be associated with second hip fracture in patients with heart disease.