title: Uncemented total hip arthroplasty in osteoarthritis of hip secondary to low and high dislocated hips: A mid-term follow-up study.
abstract: BACKGROUND
  Performing successful total hip replacement (THR) in dysplastic, subluxed, and dislocated hip is a challenging task. Here, we assessed midterm clinical and radiological outcomes of uncemented total hip arthroplasty in osteoarthritis (OA) of hip secondary to Hartofilakidis low and high-dislocated hips with a mean follow-up of 8.8 years.
  
  
  METHODS
  A retrospective study of prospectively collected data was designed involving all consecutive patients who underwent uncemented THR for OA of hip secondary to developmental dysplasia of the hip and Grade II or Grade III Hartofilakidis classification.
  
  
  RESULTS
  Thirty-two patients underwent 45 THR, with 23 Grade II (low dislocation) and 22 Grade III (high-dislocation) of Hartofilakidis classification. Thirteen patients had bilateral hip replacements, 19 patients had unilateral THR. There was highly statistically significant difference between preoperative and postoperative HHS and SF-36v2™ at each follow-up. Survivorship of original implant was 98.88% at a mean follow-up of 8.8 years. The mean improvement in leg length in this series was 3.6 cm (1.8-4.5, 95% confidence interval). No sciatic nerve or femoral nerve palsies were observed.
  
  
  CONCLUSIONS
  Uncemented THR provides better function and quality of life. However, longer follow-up studies are needed to assess survivorship of uncemented THR in Hartofilakidis low and high-dislocations.
authors.affiliation: Department of Trauma and Orthopaedic Surgery, Galway University Hospitals, Galway, Ireland.
authors.forename: Sudarshan
authors.initials: S
authors.lastname: Munigangaiah
authors.affiliation: Department of Orthopaedic Surgery, Mid-Western Regional Orthopaedic Hospital, Croom, Co. Limerick, Ireland.
authors.forename: Sinead
authors.initials: S
authors.lastname: O'Dwyer
authors.affiliation: Department of Orthopaedic Surgery, Mid-Western Regional Orthopaedic Hospital, Croom, Co. Limerick, Ireland.
authors.forename: Eric
authors.initials: E
authors.lastname: Masterson
keywords: Developmental dysplasia of hip; high-dislocation; secondary osteoarthritis; uncemented prosthesis; uncemented total hip replacement