title: Umbrella-shaped, memory alloy femoral head support device for treatment of avascular osteonecrosis of the femoral head.
abstract: OBJECTIVE
  Avascular necrosis (AVN) of the femoral head is a common orthopaedic disease that is difficult to treat. The purpose of this study was to explore the preliminary efficacy of a self-designed umbrella-shaped memory alloy femoral head support device in the treatment of adult patients with avascular osteonecrosis of the femoral head.
  
  
  METHODS
  The minimally-invasive approach involved curettage of the necrotic tissue of the femoral head, and a self-designed umbrella-shaped, memory alloy femoral head support device was implanted into the collapsed necrotic area to support the collapsed femoral head. Autologous iliac bone and artificial bone were implanted into the support device for the treatment of adult patients with avascular osteonecrosis of the femoral head.
  
  
  RESULTS
  The clinical device was used in ten patients and 18 hip joints. The support device failed in one hip joint, which subsequently underwent joint replacement surgery, and the remaining 17 implanted devices were followed up for four to 19 months. The 17 postoperative hip joints were evaluated using the percent-efficacy evaluation method for avascular osteonecrosis of the femoral head in adult patients, and the efficacy rate was 82.35 %.
  
  
  CONCLUSIONS
  The umbrella-shaped femoral head support device can be used in Ficat stage I, stage II, and stage III adult patients with avascular osteonecrosis of the femoral head.
authors.affiliation: Department of Orthopaedic Surgery, Shanghai Sixth People's Hospital, Shanghai Jiaotong University School of Medicine, Shanghai 200233, People's Republic of China.
authors.forename: Xiaowei
authors.initials: X
authors.lastname: Yu
authors.forename: Wenxiong
authors.initials: W
authors.lastname: Jiang
authors.forename: Qi
authors.initials: Q
authors.lastname: Pan
authors.forename: Tianyi
authors.initials: T
authors.lastname: Wu
authors.forename: Yan
authors.initials: Y
authors.lastname: Zhang
authors.forename: Zubin
authors.initials: Z
authors.lastname: Zhou
authors.forename: Dongpeng
authors.initials: D
authors.lastname: Du
mesh_terms: D000328:Adult; D019644:Arthroplasty, Replacement, Hip / Q000295:instrumentation* / Q000379:methods*; D016025:Bone Transplantation; D005260:Female; D005269:Femur / Q000000981:diagnostic imaging / Q000601:surgery; D005271:Femur Head Necrosis / Q000601:surgery*; D005500:Follow-Up Studies; D006621:Hip Joint / Q000000981:diagnostic imaging / Q000601:surgery; D006622:Hip Prosthesis; D006801:Humans; D008297:Male; D008875:Middle Aged; D011474:Prosthesis Design; D011859:Radiography; D012189:Retrospective Studies; D012720:Severity of Illness Index; D014182:Transplantation, Autologous; D016896:Treatment Outcome