Deep digital flexor tendon shortening as a treatment for distal interphalangeal joint hyperextension in a 2-year-old mare. 
Shortening of the deep digital flexor tendon was performed by tenotomy, overlapping and anastomosis.  The procedure was performed on a two-year-old Quarter Horse Mare with distal interphalangeal joint hyperextension with subluxation and metatarsophalangeal joint hyperextension.  These problems originated from damage to the digital flexor tendons, presumably due to previous distal limb trauma.  The procedure markedly improved the mare's level of comfort, degree of ambulation and limb conformation.  Two years following surgery the mare was comfortable at pasture.