PURPOSE:Hip resurfacing arthroplasty (HRA) is a technically demanding operation, requiring both accuracy and precision in placement of the acetabular and femoral components. Malalignment of the component can lead to notching and possible femoral neck fractures. We used specific templates created using a rapid prototyping machine based on the patients' anatomy, to aid in accurate intraoperative pin placement. METHODS: A 3D model of the hip was reconstructed using spiral computed tomography (CT) data by Amira 3.1 software in 16 patients in whom HRA was planned for hip osteoarthritis (OA). All of the patients in the study had normal contralateral hips. The rotational centre of femoral head on the normal side was superimposed using Imageware12.0 software to determine the centre of the femoral head on the contralateral side. The data was then used to produce patient-specific templates using a rapid prototyping technique. These templates were designed according to the anatomical features of femoral head surface, the rotation centre and the planned prosthesis shaft angle. The orientation of the prosthesis was determined by matching the model to the femoral head surface during the operation. In addition, a control group of 18 patients with OA was operated upon by the conventional method. RESULTS: The mean prosthesis stem shaft angle (SSA), as determined from postoperative imaging, was 138.68 ± 8.85° for the locating template group, and (118.9 ± 12.8) for the conventional group. CONCLUSIONS: The locating template designed and constructed preoperatively can provide precise and dependable location for hip resurfacing femoral components during arthroplasty and ensure the valgus stem placement necessary for optimal outcomes.
RCT Entities:
PURPOSE: Hip resurfacing arthroplasty (HRA) is a technically demanding operation, requiring both accuracy and precision in placement of the acetabular and femoral components. Malalignment of the component can lead to notching and possible femoral neck fractures. We used specific templates created using a rapid prototyping machine based on the patients' anatomy, to aid in accurate intraoperative pin placement. METHODS: A 3D model of the hip was reconstructed using spiral computed tomography (CT) data by Amira 3.1 software in 16 patients in whom HRA was planned for hip osteoarthritis (OA). All of the patients in the study had normal contralateral hips. The rotational centre of femoral head on the normal side was superimposed using Imageware12.0 software to determine the centre of the femoral head on the contralateral side. The data was then used to produce patient-specific templates using a rapid prototyping technique. These templates were designed according to the anatomical features of femoral head surface, the rotation centre and the planned prosthesis shaft angle. The orientation of the prosthesis was determined by matching the model to the femoral head surface during the operation. In addition, a control group of 18 patients with OA was operated upon by the conventional method. RESULTS: The mean prosthesis stem shaft angle (SSA), as determined from postoperative imaging, was 138.68 ± 8.85° for the locating template group, and (118.9 ± 12.8) for the conventional group. CONCLUSIONS: The locating template designed and constructed preoperatively can provide precise and dependable location for hip resurfacing femoral components during arthroplasty and ensure the valgus stem placement necessary for optimal outcomes.
Authors: Antony J Hodgson; Kevin B Inkpen; Mark Shekhman; Carolyn Anglin; Jerome Tonetti; Bassam A Masri; Clive P Duncan; Donald S Garbuz; Nelson V Greidanus Journal: Comput Aided Surg Date: 2005 Sep-Nov
Authors: Peter Belei; Adrian Skwara; Matías De La Fuente; Erik Schkommodau; Susanne Fuchs; Dieter-C Wirtz; Christian Kämper; Klaus Radermacher Journal: Comput Aided Surg Date: 2007-05
Authors: Wolf-Christoph Witzleb; M Arnold; F Krummenauer; A Knecht; H Ranisch; K-P Günther Journal: Eur J Med Res Date: 2008-01-23 Impact factor: 2.175
Authors: Harlan C Amstutz; Paul E Beaulé; Frederick J Dorey; Michel J Le Duff; Pat A Campbell; Thomas A Gruen Journal: J Bone Joint Surg Am Date: 2004-01 Impact factor: 5.284
Authors: Dimitris Mitsouras; Peter Liacouras; Amir Imanzadeh; Andreas A Giannopoulos; Tianrun Cai; Kanako K Kumamaru; Elizabeth George; Nicole Wake; Edward J Caterson; Bohdan Pomahac; Vincent B Ho; Gerald T Grant; Frank J Rybicki Journal: Radiographics Date: 2015 Nov-Dec Impact factor: 5.333
Authors: Ronald Man Yeung Wong; Pui Yan Wong; Chaoran Liu; Yik Lok Chung; Kwok Chuen Wong; Chi Yin Tso; Simon Kwoon-Ho Chow; Wing-Hoi Cheung; Patrick Shu-Hang Yung; Chun Sing Chui; Sheung Wai Law Journal: Bone Joint Res Date: 2021-12 Impact factor: 5.853