Abstract
IntroductionA previous study reported a method called the 2D-3D registration technique to examine three-dimensional movement of the patella. However, that method requires a biplane fluoroscopy system. In the present study, the aim was to establish a new method (CT-based surface mapping method) to estimate three-dimensional positions and angles of the patella with a motion capture system and CT. MethodsIn Study 1, the most appropriate parameters for the CT-based surface mapping method (i.e., target edge length, threshold of thickness of the soft tissue, and minimum distance between markers) were explored and determined. In Study 2, three-dimensional movement (i.e., positions and angles) of the patella using the CT-based surface mapping method and the most appropriate parameters were determined, and they were compared with the true positions and angles obtained by CT. ResultsThe results of Study 1 showed that the most appropriate conditions were as follows: (1) target edge length, 3 mm; (2) threshold of thickness of the soft tissue, 0–20 mm; and (3) minimum distance between markers, 10 mm. The results of Study 2 showed that the errors of the positions and angles were less than approximately 10 mm and 10° at most, respectively (both supine and sitting positions). ConclusionThe CT-based surface mapping method may be useful for a future study to clarify differences in three-dimensional movements of the patella between patients with patellar tendinitis and healthy subjects.
Highlights
A previous study reported a method called the 2D-3D registration technique to examine threedimensional movement of the patella
In Study 2, three-dimensional movement of the patella using the computed tomography (CT)-based surface mapping method and the most appropriate parameters were determined, and they were compared with the true positions and angles obtained by CT
The results of Study 2 showed that the errors of the positions and angles were less than approximately 10 mm and 10 at most, respectively
Summary
A previous study reported a method called the 2D-3D registration technique to examine threedimensional movement of the patella. Excessive muscle force of the quadriceps may cause “abnormal patellar tracking” based on these previous studies [3, 4], and the abnormal patellar tracking may cause biomechanical stress to the patellar tendon (i.e., repetitive tensile overload or impingement [5]). For these reasons, it is important to establish and develop a method to measure three-dimensional movement of the patella (i.e., positions and angles) (see Table 1). Several previous studies that examined three-dimensional movement of the patella during human movements have been reported [6, 7, 8, 9].
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