title: [Anatomic reconstruction of hip joint biomechanics with the bone preserving Silent Micro Hip™ prosthesis].
abstract: BACKGROUND
  The design and the surgical technique of the Silent Micro Hip™ are different compared to other hip stems due to a conical shape for fixation within the metaphyseal femur. The purpose of the present study was to evaluate hip joint biomechanics of the Silent Micro Hip™ in comparison to other implants. Implant-specific differences are highlighted.
  
  
  METHODS
  150 consecutive patients (each group 50 Silent Micro Hip™, Nanos™ and SL-Plus™ MIA) were analysed retrospectively. For evaluation of biomechanical parameters pre- and postoperative X-rays (pelvic AP views) were used.
  
  
  RESULTS
  The horizontal femoral offset and the limb length showed no significant difference between the Silent Micro Hip™ and the Nanos™ or SL-Plus™ MIA stem at the reconstructed hip. An almost anatomic reconstruction of hip joint biomechanics was reached with all three types of implants.
  
  
  CONCLUSIONS
  The Silent Micro Hip™ allows for almost anatomic reconstruction of hip joint biomechanics. Short-term results support the bone-preserving reconstruction with a proximal femoral load transfer. Further studies on the mid- and long-term outcomes are ongoing.
authors.affiliation: Klinik und Poliklinik für Orthopädie und Unfallchirurgie, Universität zu Köln.
authors.forename: C
authors.initials: C
authors.lastname: Ries
authors.forename: W
authors.initials: W
authors.lastname: Schopf
authors.forename: F
authors.initials: F
authors.lastname: Dietrich
authors.forename: S
authors.initials: S
authors.lastname: Franke
authors.forename: E
authors.initials: E
authors.lastname: Jakubowitz
authors.forename: C
authors.initials: C
authors.lastname: Sobau
authors.forename: C
authors.initials: C
authors.lastname: Heisel
mesh_terms: D019644:Arthroplasty, Replacement, Hip / Q000295:instrumentation / Q000379:methods; D019544:Equipment Failure Analysis; D005260:Female; D006621:Hip Joint / Q000503:physiopathology* / Q000601:surgery*; D006622:Hip Prosthesis; D006801:Humans; D008297:Male; D008875:Middle Aged; D008904:Miniaturization; D059351:Organ Sparing Treatments / Q000295:instrumentation / Q000379:methods*; D015207:Osteoarthritis, Hip / Q000473:pathology / Q000503:physiopathology* / Q000601:surgery*; D011474:Prosthesis Design; D016059:Range of Motion, Articular; D016896:Treatment Outcome