The is a retrospective analysis to study the characteristics of elderly patients treated with total hip replacements during past 5 years．

Patients underwent total hip replacement due to removal of the hip caused by retrogressive lesions, is conducive to the improvement of hip function .But at the same time,the complications from patients accepted total hip replacement surgery will directly or indirectly affect the prognosis of the patients, resulting in patients with delayed recovery and increase the hospitalization time and cost. Serious complications can lead to patients deaths during perioperative period. This study was designed to provide a retrospective analysis of postoperative recovery, quality of life, and complications in patients undergoing hip replacement over the past five years, providing data for clinical studies.

Inclusion Criteria:

1. ASA Ⅱ-Ⅲ,elective operation patients，
2. NO other severe complication history

Exclusion Criteria:

1. Having severe comorbidity
2. not for the first time of joint replacement
3. Suffered from neurologic disorder or impaired mental state

From January 2012 to July 30，2017，approximately 1500 cases of primary hip replacement in this study，including male ，female and bilateral replacements．