Methodology and validity of assessing kinematics of the thoracolumbar vertebral column in horses on the basis of skin-fixated markers.

The abstract summarizes a research study evaluating the effectiveness of using markers attached to the skin for studying movement in the thoracolumbar vertebral column in horses. The results suggest that these markers can provide accurate information on specific motions, with some limitations.

Research Methodology

• The research employed 5 Dutch Warmblood horses free from vertebral column abnormalities. Markers were attached directly to their bones and skin to track motion in various points of the vertebral column including T6, T10, T13, T17, L1, L3, L5, S3, and both tuber coxae.
• These horses were made to walk and trot on a treadmill, and the researchers collected three-dimensional data from the markers throughout these activities.
• Data analysis involved comparing flexion-extension motion patterns, or how the vertebral column bent and stretched, based on data from the skin-fixed and bone-fixed markers.

Study Findings

• The use of skin-attached markers rendered satisfactory results in terms of determining the range and direction of motion (flexion-extension) of the thoracolumbar vertebrae and rotational motion of the sacrum while the horses were walking and trotting.
• The data retrieved from skin-fixed markers accurately determined lateral bending, or side to side movement, at the walk for the mid-thoracic and lower lumbar area of the vertebral column only. However, they were valid for determining lateral bending for all thoracolumbar vertebrae when the horses were trotting.

Research Conclusions

• Although skin-fixed markers are useful in determining certain aspects of vertebral motion in horses, care must be taken when interpreting data on lateral bending motions during walking. Nevertheless, the study determined that for other forms of rotation at a walk, and all forms of rotation when trotting, skin-fixed markers provided valid results.
• Identifying how much marker movement reflects true vertebral motion is crucial for developing non-invasive techniques in diagnosing vertebral and muscle abnormalities in horses.