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- Title
Simultaneous measurements of knee motion using an optical tracking system and radiostereometric analysis (RSA).
- Authors
Tranberg, Roy; Saari, Tuuli; Zügner, Roland; Kärrholm, Johan
- Abstract
Background and purpose Invasive methods are more reproducible and accurate than non-invasive ones when it comes to recording knee kinematics, but they are usually less accessible and less safe, mainly due to risk of infection. For this reason, non-invasive methods with passive markers are widely used. With these methods, varying marker sets based on a number of single markers, or sets of markers, known as clusters, are used to track body segments. We compared one invasive method--radiostereometric analysis--with a non-invasive method, an optical tracking system with 15 skin-mounted markers. Methods 9 subjects (10 knees) were investigated simultaneously with a dynamic RSA system and a motion-capture system while performing an active knee extension. Results For flexion/extension, there was good agreement on an individual basis and at the group level. For internal/external rotation, the group mean was fairly similar, up to 25 degrees of flexion. Recordings of abductions and/or adductions revealed a systematic mean difference of 2--4 degrees during the range of flexion measured. The correlation between the 2 methods in the horizontal and frontal planes was poor. Interpretation Our skin-marker model provided reliable data for flexion/extension. Recordings of internal/external rotation and abduction/adduction were less accurate on an individual basis than at the group level, most probably due to soft-tissue motion and the presence of small true motion in these planes.
- Subjects
KNEE physiology; PATELLOFEMORAL joint physiology; COMPUTER software; CONFIDENCE intervals; RANGE of motion of joints; KINEMATICS; RESEARCH funding; TOTAL knee replacement; DATA analysis; RADIOSTEREOMETRY
- Publication
Acta Orthopaedica, 2011, Vol 82, Issue 2, p171
- ISSN
1745-3674
- Publication type
Article
- DOI
10.3109/17453674.2011.570675