Porous Tantalum Rods Improve the Hip Joint Function of Patients With Avascular Necrosis of the Femoral Head

Inclusion Criteria: * Patients with fracture nonunion as indicated by a clear fracture line 12 months after femoral neck fracture; avascular necrosis of the femoral head as shown by cystic degeneration, sclerosis, and uneven density on X-ray images and CT scans * Patients with avascular necrosis of the femoral head after femoral neck fracture surgery who underwent internal fixation between 1 January 2016 and 31 May 2017 * Age 18-80 years * Any sex and nationality * Provision of signed informed consent to participate in the trial Exclusion Criteria: * Poor general health * Chronic disease or history of surgery * Alcohol abuse or long-term use of hormone drugs * Unable or declines to cooperate with treatment and examination because of language and/or mental disorders * Unable or declines to cooperate with rehabilitation treatment because of mental and/or psychological disorders