title: Periacetabular osteotomy for containment of the nonarthritic dysplastic hip secondary to poliomyelitis.
abstract: BACKGROUND
  Poliomyelitis results in a flaccid paralysis of muscles that can lead to hip instability. The objective of this study was to determine the results of the Bernese periacetabular osteotomy in patients with paralytic hips secondary to poliomyelitis.
  
  
  METHODS
  Nine patients who had a Bernese periacetabular osteotomy were identified as having paralytic hip dysplasia secondary to poliomyelitis. All patients had hip pain and instability at the time of presentation. Clinical records and radiographs were reviewed. One patient did not return for physical examination at last follow-up.
  
  
  RESULTS
  The mean length of follow-up was 103 months. All patients had a decrease in the severity of pain but less improvement in function, as hip abductor muscle strength was improved in only two of the eight patients examined. The average postoperative Harris hip score was 80.2. All patients had an improvement in the extrusion index, the acetabular index, and the lateral center-edge angle. According to the Tönnis radiographic classification, three patients progressed from Grade 0 to Grade 1 and one patient progressed from Grade 1 to 2.
  
  
  CONCLUSIONS
  The correction obtained with use of the Bernese periacetabular osteotomy provides containment of the hip joint in patients with hip dysplasia secondary to poliomyelitis. The patients had a decrease in the severity of pain and less improvement in function. The results have been long-lasting and may have slowed the progression of osteoarthritis of the hip.
authors.affiliation: Inselspital University of Bern, Bern, Switzerland. sierra.rafael@mayo.edu
authors.forename: Rafael J
authors.initials: RJ
authors.lastname: Sierra
authors.forename: S Ralf
authors.initials: SR
authors.lastname: Schoeniger
authors.forename: Michael
authors.initials: M
authors.lastname: Millis
authors.forename: Reinhold
authors.initials: R
authors.lastname: Ganz
mesh_terms: D000077:Acetabulum / Q000000981:diagnostic imaging / Q000503:physiopathology / Q000601:surgery*; D000293:Adolescent; D000328:Adult; D000704:Analysis of Variance; D018771:Arthralgia / Q000209:etiology / Q000503:physiopathology; D002648:Child; D005260:Female; D005500:Follow-Up Studies; D006617:Hip Dislocation / Q000000981:diagnostic imaging / Q000209:etiology / Q000601:surgery*; D006801:Humans; D007593:Joint Instability / Q000000981:diagnostic imaging / Q000209:etiology / Q000601:surgery*; D008297:Male; D008875:Middle Aged; D010027:Osteotomy / Q000379:methods*; D010147:Pain Measurement; D011051:Poliomyelitis / Q000150:complications* / Q000175:diagnosis; D011300:Preoperative Care; D011859:Radiography; D016059:Range of Motion, Articular / Q000502:physiology; D018570:Risk Assessment; D012494:Sampling Studies; D012720:Severity of Illness Index; D016896:Treatment Outcome; D055815:Young Adult