A transverse sheet of tissue called the annular ligament lies over the flexor tendons at the level of the fetlock joint on both front and hind limbs. When this ligament is inflamed or injured, it can contribute to pain and lameness by constricting the flexor tendons and flexor tendon sheath in the fetlock. Lameness associated with this constriction can be mild to moderate and usually worsens with exercise.
A key characteristic of this problem is a bubble of swelling that abruptly cinches in at the annular ligament. However, often the annular ligament is only part of the problem. The flexor tendons within the tendon sheath may be injured as well. Radiographs and ultrasound should be performed to refine the diagnosis.
Other Diagnoses Considered
Treatments May Include
Prognosis & Relevant Factors
Prognosis depends on whether annular ligament thickening is primary or secondary, and the existence of another, secondary injury.
I Might ObserveRelated Observations
QUESTIONS TO ASK MY VET