Dr. Janicek's current address is Highway 29 Veterinary Hospital, 3500 East State Highway 29, Bertram, Texas 78605, USA.
Hindlimb kinematics before and after laser fibrotomy in horses with fibrotic myopathy
Version of Record online: 27 NOV 2012
© 2012 EVJ Ltd
Equine Veterinary Journal
Special Issue: 58th Annual Convention of the American Association of Equine Practitioners. Guest Editors: N. White, D. Sellon and B. Ball. Publication of this supplement was supported by the American Association of Equine Practitioners
Volume 44, Issue Supplement S43, pages 126–131, December 2012
How to Cite
Janicek, J., Lopes, M. A. F., Wilson, D. A., Reed, S. and Keegan, K. G. (2012), Hindlimb kinematics before and after laser fibrotomy in horses with fibrotic myopathy. Equine Veterinary Journal, 44: 126–131. doi: 10.1111/j.2042-3306.2012.00681.x
- Issue online: 27 NOV 2012
- Version of Record online: 27 NOV 2012
- Manuscript Accepted: 9 SEP 2012
- Manuscript Received: 1 MAR 2012
- E. Paige Laurie Endowed Program in Equine Lameness
- University of Missouri
- College of Veterinary Medicine
- fibrotic myopathy;
Reasons for performing study
Fibrotic myopathy can cause incapacitating gait abnormalities. Transection of the fibrotic mass followed by early post operative exercise is the best treatment for fibrotic myopathy. A laser may be used to transect the fibrotic mass. Assessment of the effectiveness of therapies for fibrotic myopathy has been limited to subjective evaluation.
To objectively assess gait abnormalities associated with fibrotic myopathy before and after laser fibrotomy followed by early post operative exercise.
Kinematic evaluation of horses with fibrotic myopathy walking and trotting on a treadmill was used to investigate hindfeet trajectories (n = 8) and lameness (n = 5) before and after laser fibrotomy. Hoof flight trajectory length (HFTL), relative protraction length (%PL), maximum hoof height during swing (MXHH), hoof height at end of protraction (HHpro) and retraction (HHret) were measured and differences between fibrotic myopathy affected and nonaffected limbs were calculated. Lameness was quantified by measuring maximum and minimum pelvic height differences between right and left halves of the stride.
Before surgery the foot of the fibrotic myopathy affected limb had abnormal trajectories characterised as increased HFTL, MXHH and HHpro and decreased %PL and HHret and the 5 horses objectively evaluated for lameness were lame in the fibrotic myopathy affected limb. Immediately after surgery the difference between affected and nonaffected limbs decreased for HFTL, %PL and HHpro. Six to 11 weeks after surgery, the HFTL difference increased but was still smaller than before surgery, which was interpreted as partial recurrence of the gait abnormality; all horses objectively evaluated for lameness were either improved (n = 1) or not lame (n = 4) in the previously affected, operated limb.
Fibrotic myopathy affects the foot flight and leads to asymmetric vertical excursion of the pelvis. Laser fibrotomy followed by early post operative exercise can minimise these abnormalities.
Laser fibrotomy combined with early post operative exercise is a viable therapy for fibrotic myopathy.