title: A short-stem hip implant with metaphyseal anchorage in patients with developmental dysplasia of the hip.
abstract: Short-stem implants are routinely used for total hip arthroplasty in younger patients that are more likely to have secondary osteoarthritis than older patients.
  To investigate the applicability of short-stem hip implants for secondary osteoarthritis due to developmental dysplasia of the hip.
  This study analyzed the clinical and radiological results of patients with developmental dysplasia of the hip (DDH, 58 hips) and compared them to those of patients with primary osteoarthritis (POA, 59 hips) treated with the metaphyseal total hip arthroplasty (Metha®) short stem with metaphyseal fixation.
  The mean clinical and radiological follow-up periods were 2.9 ± 1.1 years and 3.8 ± 1.9 years, respectively. The mean Harris Hip Score (HHS) significantly increased in both groups over this period (p< 0.0001). The caput-collum-diaphysis (CCD) angle was significantly lower in the POA group prior to surgery and significantly increased in the POA and and decreased in DDH groups, respectively. The preoperative femoral offset was lower in the DDH group and increased significantly after surgery.
  The Metha® short stem in patients with DDH allows good reconstruction of joint biomechanics with a good clinical outcome.
authors.affiliation: Department of Orthopaedic Surgery, Hannover Medical School, Hannover, Germany.
authors.forename: Stefan
authors.initials: S
authors.lastname: Budde
authors.affiliation: Department of Orthopaedic Surgery, Hannover Medical School, Hannover, Germany.
authors.forename: Thilo
authors.initials: T
authors.lastname: Floerkemeier
authors.affiliation: Center for Hip, Knee and Foot Surgery, Sports Traumatology, ATOS Hospital, Heidelberg, Germany.
authors.forename: Fritz
authors.initials: F
authors.lastname: Thorey
authors.affiliation: Department of Orthopaedic Surgery, Hannover Medical School, Hannover, Germany.
authors.forename: Marco
authors.initials: M
authors.lastname: Ezechieli
authors.affiliation: Department of Orthopaedic Surgery, Hannover Medical School, Hannover, Germany.
authors.forename: Leif
authors.initials: L
authors.lastname: Claassen
authors.affiliation: Department of Orthopaedic Surgery, Hannover Medical School, Hannover, Germany.
authors.forename: Max
authors.initials: M
authors.lastname: Ettinger
authors.affiliation: Department of Orthopaedic and Trauma Surgery, University Hospital of Cologne, Cologne, Germany.
authors.forename: Jan
authors.initials: J
authors.lastname: Bredow
authors.affiliation: Department of Orthopaedic Surgery, Hannover Medical School, Hannover, Germany.
authors.forename: Henning
authors.initials: H
authors.lastname: Windhagen
authors.affiliation: Department of Orthopaedic Surgery, Hannover Medical School, Hannover, Germany.
authors.forename: Gabriela von
authors.initials: GV
authors.lastname: Lewinski
keywords: Developmental dysplasia; short stem; total hip arthroplasty