Capped Hock and Capped Elbow in Horses: Swelling, Trauma, and Care
- Capped hock and capped elbow are fluid-filled or fibrous swellings over the point of the hock or elbow, usually caused by repeated trauma to a bursa.
- Many horses are not lame and need monitoring plus removal of the cause, but pain, heat, drainage, or worsening swelling mean your horse should be examined promptly by your vet.
- Common triggers include kicking stall walls, trailer trauma, lying on hard bedding, prolonged recumbency, and the hind edge of a shoe striking the elbow while the horse is lying down.
- Early cases may improve with rest, cold therapy, padding, and anti-inflammatory care directed by your vet. Chronic, infected, or cosmetically significant cases may need drainage, imaging, or surgery.
What Is Capped Hock and Capped Elbow in Horses?
Capped hock and capped elbow are forms of bursitis, meaning inflammation and swelling of a bursa. A bursa is a small fluid-filled sac that helps reduce friction between skin, tendons, and bone. In horses, these swellings develop over the point of the hock (the tuber calcanei) or the point of the elbow (the olecranon). Capped elbow is also commonly called a shoe boil.
These swellings are often caused by repeated pressure or blunt trauma. Early on, the area may feel soft and fluctuant because it contains fluid. Over time, especially if the area keeps getting bumped, the body can form a thicker fibrous capsule, making the swelling feel firmer and harder to resolve.
The good news is that many horses with capped hock or capped elbow are not lame and are dealing with more of a cosmetic issue than a performance-limiting one. Still, some cases become painful, infected, or large enough to interfere with comfort. That is why it helps to have your vet confirm what kind of swelling is present and whether deeper structures are involved.
Symptoms of Capped Hock and Capped Elbow in Horses
- Rounded swelling over the point of the hock or elbow
- Soft, squishy, fluid-filled swelling in early cases
- Firm or thickened lump in chronic or recurrent cases
- Usually little to no lameness in uncomplicated cases
- Mild tenderness when the area is bumped or pressed
- Hair loss, rubbed skin, or callusing over the swelling
- Heat, pain, drainage, or a sudden increase in size if infection or abscess is developing
- Lameness or reluctance to move if deeper bursae, nearby tendons, or infection are involved
Many uncomplicated capped hocks and capped elbows are more noticeable than painful. A horse may continue moving normally, eating well, and acting comfortable. That said, heat, marked pain, discharge, fever, worsening swelling, or any lameness deserve faster attention because they can point to infection, deeper injury, or a different diagnosis.
If the swelling appeared after a kick, trailer incident, fall, or puncture wound, it is wise to have your vet examine it sooner rather than later. Swellings around the hock can occasionally involve deeper bursae and nearby tendons, which can be more serious than a simple superficial blemish.
What Causes Capped Hock and Capped Elbow in Horses?
The most common cause is repeated trauma. For capped hock, that often means banging the hocks against stall walls, kicking doors, leaning on hard surfaces, or hitting the back of the hock during transport. For capped elbow, repeated pressure from lying on hard ground is a common trigger, and some horses develop a shoe boil when the heel of the hoof or shoe presses against the elbow while they are lying down.
Other contributing factors include poor bedding, prolonged recumbency, awkward stall design, trailer tailgate trauma, and conformational or shoeing factors that make contact with the elbow more likely. Horses recovering from illness or injury may spend more time lying down, which increases pressure on these areas.
Less commonly, the swelling can become infected after a puncture wound, skin break, injection, or bacteria spreading through the bloodstream. In those cases, the problem shifts from a mostly cosmetic swelling to a more medically important one that may need drainage, imaging, and antimicrobial treatment directed by your vet.
How Is Capped Hock and Capped Elbow in Horses Diagnosed?
Diagnosis starts with a hands-on exam. Your vet will look at the location of the swelling, whether it feels soft or fibrous, whether the skin is intact, and whether your horse shows pain or lameness. History matters too. Details like recent stall kicking, trailer travel, hard bedding, new shoes, or prolonged time lying down can strongly support the diagnosis.
In straightforward cases, a physical exam may be enough. If the swelling is painful, hot, draining, recurrent, or unusually large, your vet may recommend ultrasound or radiographs to check the bursa, nearby soft tissues, and underlying bone. Imaging is especially helpful around the hock, where deeper calcaneal bursae and tendon structures can sometimes be involved.
Your vet may also discuss aspiration of the swelling in selected cases. This can help identify fluid, blood, or infection, but it also carries a risk of introducing bacteria, so it is not something to try at home. If infection is suspected, fluid analysis and culture can help guide treatment.
Treatment Options for Capped Hock and Capped Elbow in Horses
Spectrum of Care means you have options. Here are treatment tiers at different price points.
Budget-Conscious Care
- Farm call or basic exam
- Cold hosing or cold packs early in the course
- Rest or turnout changes to reduce repeat trauma
- Bedding, stall, trailer, or behavior modifications
- Protective padding or a shoe-boil roll for capped elbow when appropriate
- Vet-directed NSAID plan if your horse is sore
Recommended Standard Treatment
- Complete exam and lameness assessment if needed
- Radiographs and/or ultrasound when the diagnosis is uncertain or deeper injury is possible
- Careful aspiration by your vet in selected cases
- Possible intrabursal medication such as corticosteroid when appropriate and infection is not suspected
- Bandaging or protective management plan
- Follow-up recheck to monitor recurrence or complications
Advanced / Critical Care
- Referral-level imaging and repeat diagnostics
- Surgical drainage, curettage, or bursoscopic lavage/debridement when indicated
- Hospitalization and sterile wound management
- Systemic and local antimicrobial therapy for infected bursitis
- Pain control and structured aftercare
- Monitoring for complications such as abscessation or deeper calcaneal involvement
Cost estimates as of 2026-03. Actual costs vary by location, clinic, and individual case.
Questions to Ask Your Vet About Capped Hock and Capped Elbow in Horses
Bring these questions to your vet appointment to get the most out of your visit.
- You can ask your vet whether this swelling seems superficial or whether deeper bursae, tendons, or bone could be involved.
- You can ask your vet what likely caused the swelling in your horse's case and what changes would best prevent repeat trauma.
- You can ask your vet whether imaging such as ultrasound or radiographs would change the treatment plan.
- You can ask your vet if this looks aseptic or if there are signs of infection that need faster treatment.
- You can ask your vet whether aspiration or injection is appropriate, and what benefits and risks come with those procedures.
- You can ask your vet whether a shoe-boil roll, padding, bedding changes, or shoeing adjustments would help.
- You can ask your vet what level of exercise is safe while the swelling is healing.
- You can ask your vet what warning signs would mean the condition is getting worse and needs a recheck.
How to Prevent Capped Hock and Capped Elbow in Horses
Prevention focuses on reducing repeated trauma. Make sure your horse has adequate bedding, especially if they spend long periods stalled. Check stalls and trailers for hard edges, low partitions, or surfaces your horse may strike with the hocks. Horses that kick walls may need management changes, more turnout, environmental enrichment, or other behavior-focused strategies discussed with your vet and barn team.
For capped elbow, review shoeing and lying-down mechanics. If the heel of the hoof or shoe is contacting the elbow, your vet or farrier may recommend adjustments, and some horses benefit from a shoe-boil roll placed around the pastern to reduce repeat contact. This is especially helpful when recurrence is linked to the hoof striking the elbow during rest.
It also helps to act early. Small, fresh swellings are often easier to manage than long-standing ones. If you notice a new lump over the hock or elbow, take photos, reduce trauma right away, and contact your vet if the area is painful, hot, draining, or not improving.