Repeat validation of a method to measure in vivo three dimensional hip kinematics using computed tomography and fluoroscopy

Abstract

Total hip arthroplasty or THA is a surgical procedure for the relief of significant disabling pain caused by osteoarthritis or hip fracture. Knowledge of the 3D kinematics of the hip during specific functional activities is important for THA component design. In this paper we compare kinematic measurements obtained by a new 2D-3D registration algorithm with measurements provided by the gold standard roentgen stereo analysis (RSA). The study validates a promising method for investigating the kinematics of some pathologies, which involves fitting three dimensional patient specific 3D CT scans to dynamic fluoroscopic images of the hip during functional activities. This is the first study in which single plane fluoroscopy has been used for kinematic measurements of natural hip bones. The main focus of the study is on the out-of-plane translation and rotation movements which are difficult to measure precisely using a single plane approach. From our experimental results we found that the precision of our proposed approach compares favourably with that of the most recent dual plane fluoroscopy approach.

Arthroscopic Femoral and Acetabular Osteoplasties Alter the In Vivo Hip Kinematics of Patients With Femoroacetabular Impingement

“…Details of the method have been described previously. 16 , 18 Joint kinematics were measured using the International Society of Biomechanics recommendations for hip joint kinematics. 21 Each patient’s preoperative planning CT scan (Aquilion Prime; Toshiba, Tokyo, Japan; 2-mm slice thickness, 0.95 mm/pixel resolution) was used to define a 3D model of the hip joint.…”

“…In the current study, a validated method involving intraoperative 3-dimensional (3D)–2-dimensional (2D) image registration was used to address the aforementioned limitations. 16 , 17 , 18 The method was implemented to measure 3D kinematics before and after hip arthroscopy in patients with FAI.…”

Validation of a method to measure three-dimensional hip joint kinematics in subjects with femoroacetabular impingement

“…The method for 3D–2D registration has been outlined previously. 13,15 In brief, 3D–2D image registration, in the context of the current study, is the process of aligning a 3D hip model derived from a static CT scan, with 2D dynamic fluoroscopic images obtained during a functional activity on a different occasion, in order to determine the 3D positions of the bones in space. The process of aligning the 3D hip model with 2D images is demonstrated in Figure 2.…”