Does your horse have lameness that your
vet hasn't been able to diagnose or treat?
Could it be Degenerative Suspensory Ligament Desmitis  (DSLD) ?

This disorder is now known to occur in many horse breeds.
If your horse is chronically lame or fails a flexion test (especially bilaterally), your
veterinarian can perform an ultrasound of the suspensories to diagnose or rule out
DSLD. Please ask specifically for your veterinarian to consider DSLD as a diagnosis, and
specifically to rule it out.

Today DSLD is incurable. Please support the research.
For more information
http://tech.groups.yahoo.com/group/DSLD-equine/
and
http://bridlepath.wordpress.com/2007/01/27/dsld-espa/
and
http://dsldequine.info/