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Treadmill study of the range of back movement at the walk in horses without back pain

Theresia F. LickaClinic for Orthopaedics in Ungulates, University of Veterinary Medicine Vienna, Veterinaerplatz 1, A-1210 Vienna, Austria.
Present address is Easter Bush Veterinary Centre, Royal (Dick) School of Veterinary Studies, University of Edinburgh, Easter Bush, Roslin, Midlothian EH 25 9RG, Scotland.

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Christian PehamClinic for Orthopaedics in Ungulates, University of Veterinary Medicine Vienna, Veterinaerplatz 1, A-1210 Vienna, Austria.

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Elisabeth ZohmannClinic for Orthopaedics in Ungulates, University of Veterinary Medicine Vienna, Veterinaerplatz 1, A-1210 Vienna, Austria.

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Abstract

Objective—To evaluate back movement during walking in horses.

Animals—22 adult horses with no history or signs of back pain.

Procedure—3-dimensional movements of markers on the hooves, head, and back were measured with a motion analysis system while the horses were walking on a treadmill. The positions of markers on the hooves, head, and the skin above the spinous processes of T5, T10, T16, L3, and 2 sacral vertebrae were recorded. From a minimum of 6 walking motion cycles/horse, marker movement and the time of occurrence of minimum and maximum marker positions within the motion cycle were determined. Angles were calculated between the markers on the head, T16, and S4 or S5 and between the markers on T5, T16, and S4 or S5.

Results—Lateral back movement was maximal at L3, where it reached (mean ± SD) 3.5 ± 0.8% of the horses' height at the withers. Maximum dorsoventral back movement was found at the sacrum, where it reached 4.7 ± 1.3% of the height at the withers. In the horizontal plane, the angle between T5, T16, and S4 or S5 was altered by 11 ± 2.5° during the motion cycle. In the sagittal plane, the angle between the head, T16, and S4 or S5 was altered by 7 ± 3°.

Conclusions and Clinical Relevance—Results of this study may be used as basic kinematic reference data for evaluation of back movement in horses. (Am J Vet Res 2001;62:1173–1179)

Abstract

Objective—To evaluate back movement during walking in horses.

Animals—22 adult horses with no history or signs of back pain.

Procedure—3-dimensional movements of markers on the hooves, head, and back were measured with a motion analysis system while the horses were walking on a treadmill. The positions of markers on the hooves, head, and the skin above the spinous processes of T5, T10, T16, L3, and 2 sacral vertebrae were recorded. From a minimum of 6 walking motion cycles/horse, marker movement and the time of occurrence of minimum and maximum marker positions within the motion cycle were determined. Angles were calculated between the markers on the head, T16, and S4 or S5 and between the markers on T5, T16, and S4 or S5.

Results—Lateral back movement was maximal at L3, where it reached (mean ± SD) 3.5 ± 0.8% of the horses' height at the withers. Maximum dorsoventral back movement was found at the sacrum, where it reached 4.7 ± 1.3% of the height at the withers. In the horizontal plane, the angle between T5, T16, and S4 or S5 was altered by 11 ± 2.5° during the motion cycle. In the sagittal plane, the angle between the head, T16, and S4 or S5 was altered by 7 ± 3°.

Conclusions and Clinical Relevance—Results of this study may be used as basic kinematic reference data for evaluation of back movement in horses. (Am J Vet Res 2001;62:1173–1179)