Assessing validation of dual fluoroscopic image matching method for measurement of in vivo spine kinematics.

摘要: Background Accurate knowledge of the spinal structural functions is critical to understand biomechanical factors that affect pathology. Many studies have investigated human vertebral motion both in vitro and vivo. However, determination vivo vertebrae under physiologic loading conditions remains a challenge biomedical engineering because limitations current technology complicated anatomy spine. Methods For validation, lumbar specimen was imbedded with steel beads moved known distance by an universal testing machine (UTM). The dual fluoroscopic system used capture spine reproduce moving distance. living subject various positions while bearing weight. fluoroscopes were 5 times. standard deviations translation orientation five measurements evaluate repeatability technique. accuracy outline matching metallic marks compared. Results could be determined mean less than 0.35 mm 0.36 for image method reproducing six degrees freedom (6DOF) kinematics 0.43 0.65° rotation. did not show significant difference. Conclusions Combining computerized tomography imaging technique accurate reproduceable noninvasive measurement motion. useful orientations which can improve efficacy surgical treatments. Chin Med J 2011;124(11):1689-1694