Windpuffs in Horses

Windpuffs are soft, fluid-filled swellings toward the back of the fetlock joint, resulting from inflamed deep digital flexor tendon sheaths. Most commonly, these puffy enlargements are symptomless blemishes–old and cold, the result of years of hard work.
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Windpuffs in Horses
Fluid-filled swellings in the rear aspect of the tendon/fetlock area—called 'windpuffs,'” or synovial effusion of the tendon sheath—are a common condition in horses. | Photo: The Horse Staff

These fluid-filling swellings often are just blemishes, but attention should be given if they are new or associated with lameness.

Windpuffs are soft, fluid-filled swellings toward the back of the fetlock joint, resulting from inflamed deep digital flexor tendon sheaths. Most commonly, these puffy enlargements are symptomless blemishes–old and cold, the result of years of hard work. In some instances, however, the horse might be lame from recent injury to the tendon sheath, with marked heat and pain in the area, when you flex the joint or palpate the swelling.

Tim Lynch, DVM, Dipl. ACVS, who focuses on equine lameness cases at Peterson & Smith Equine Hospital in Ocala, Fla., says many horses have windpuffs, especially in the rear legs, with no associated lameness.

“The swellings occur where the digital flexor tendon sheath covers the two tendons that go around the back of the fetlock,” says Lynch. “This sheath has a synovial lining, just like a joint

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Heather Smith Thomas ranches with her husband near Salmon, Idaho, raising cattle and a few horses. She has a B.A. in English and history from University of Puget Sound (1966). She has raised and trained horses for 50 years, and has been writing freelance articles and books nearly that long, publishing 20 books and more than 9,000 articles for horse and livestock publications. Some of her books include Understanding Equine Hoof Care, The Horse Conformation Handbook, Care and Management of Horses, Storey’s Guide to Raising Horses and Storey’s Guide to Training Horses. Besides having her own blog, www.heathersmiththomas.blogspot.com, she writes a biweekly blog at https://insidestorey.blogspot.com that comes out on Tuesdays.

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