Here's a breakdown:
* Navicular bursa: A fluid-filled sac located between the navicular bone and the deep digital flexor tendon. It acts as a cushion and reduces friction between these structures.
* Inflammation: In navicular bursitis, the navicular bursa becomes inflamed. This inflammation can be caused by several factors, including:
* Overuse: Repeated stress and strain on the hoof, often due to intense training or riding.
* Conformation: Certain hoof shapes or angles can increase the pressure on the navicular bursa.
* Trauma: An injury to the hoof, such as a puncture or impact.
* Underlying conditions: Other hoof problems, like navicular disease, can also contribute to bursitis.
Symptoms:
Horses with navicular bursitis typically exhibit:
* Lameness: A noticeable limping or reluctance to move, especially on hard surfaces.
* Heat: The hoof may feel warm to the touch.
* Pain: The horse may show signs of pain when the hoof is manipulated or pressure is applied.
* Sensitivity: The horse may be sensitive to touch around the heel and frog of the hoof.
* Stance: The horse may adopt a shortened stride or toe-out stance.
Diagnosis:
Diagnosing navicular bursitis typically involves:
* Physical examination: Examining the hoof, assessing lameness, and checking for heat and sensitivity.
* Radiographs: X-rays of the hoof can reveal any structural abnormalities or signs of navicular disease.
* Ultrasound: Provides detailed images of the navicular bursa and surrounding structures.
Treatment:
Treatment for navicular bursitis aims to reduce inflammation and pain:
* Rest: Avoiding strenuous activity and allowing the hoof to heal.
* Anti-inflammatory drugs: Nonsteroidal anti-inflammatory drugs (NSAIDs) to reduce inflammation.
* Cold therapy: Applying ice packs to the affected area.
* Shoe modifications: Special shoeing techniques to reduce pressure on the navicular bursa.
* Corticosteroid injections: Injections of corticosteroids into the navicular bursa can provide temporary relief.
* Surgery: In severe cases, surgery may be necessary to remove the bursa or modify the surrounding structures.
Prognosis:
The prognosis for navicular bursitis varies depending on the severity of the condition and the underlying causes. With proper treatment and management, many horses can return to a comfortable and functional lifestyle. However, chronic or severe cases may require ongoing management to prevent recurrence.