title: MyHip: supporting planning and surgical guidance for a better total hip arthroplasty : A pilot study.
abstract: OBJECTIVE
  Total hip arthroplasty (THA) aims to restore patient mobility by providing a pain-free and stable artificial joint. A successful THA depends on the planning and its execution during surgery. Both tasks rely on the experience of the surgeon to understand the complex biomechanical behavior of the hip. We investigate the hypothesis that a computer-assisted solution for THA effectively supports the preparation and execution of the planning.
  
  
  METHODS
  We devised MyHip as a computer-assisted framework for THA. The framework provides pre-operative planning based on medical imaging and optical motion capture to optimally select and position the implant. The planning considers the morphology and range of motion of the patient's hip to reduce the risk of impingements and joint instability. The framework also provides intra-operative support based on patient-specific surgical guides. We performed a post-operative analysis on three patients who underwent THA. Based on post-operative radiological images, we reconstructed a patient-specific model of the prosthetic hip to compare planned and effective positioning of the implants.
  
  
  RESULTS
  When the guides were used, we measured non-significant variations of planned executions such as bone cutting. Moreover, patients' hip motions were acquired and used in a dynamic simulation of the prosthetic hip. Conflicts prone to implant failure, such as impingements or subluxations, were not detected.
  
  
  CONCLUSIONS
  The results show that MyHip provides a promising computer assistance for THA. The results of the dynamic simulation highlighted the quality of the surgery and especially of its planning. The planning was properly executed since non-significant variations were detected during the radiological analysis.
authors: Geneva School of Health (HEdS), University of Applied Sciences of Western Switzerland (HES-SO), Av. de Champel 47, 1206, Geneva, Switzerland. jerome.schmid@hesge.ch.
authors: Jérôme
authors: J
authors: Schmid
authors: Geneva School of Health (HEdS), University of Applied Sciences of Western Switzerland (HES-SO), Av. de Champel 47, 1206, Geneva, Switzerland.
authors: Christophe
authors: C
authors: Chênes
authors: Medical Research Department, Artanim Foundation, Geneva, Switzerland.
authors: Sylvain
authors: S
authors: Chagué
authors: Orthopedics and Trauma Service, University Hospitals of Geneva, Geneva, Switzerland.
authors: Pierre
authors: P
authors: Hoffmeyer
authors: Orthopedics and Trauma Service, University Hospitals of Geneva, Geneva, Switzerland.
authors: Panayiotis
authors: P
authors: Christofilopoulos
authors: Medacta International SA, Lugano, Switzerland.
authors: Massimiliano
authors: M
authors: Bernardoni
authors: Medical Research Department, Artanim Foundation, Geneva, Switzerland.
authors: Caecilia
authors: C
authors: Charbonnier
mesh_terms: D000368:Aged; D019644:Arthroplasty, Replacement, Hip / Q000379:methods*; D006801:Humans; D008297:Male; D056888:Patient Positioning; D010865:Pilot Projects; D011300:Preoperative Care; D016059:Range of Motion, Articular; D025321:Surgery, Computer-Assisted
keywords: Guiding blocks; Impingements and joint instability; Joint kinematics; Medical imaging; Pre-operative planning; Total hip arthroplasty