Suspensory Ligament Injury in Horses: Treatment, Recovery and Return to Work

By Dr Duncan Houston

Suspensory ligament injuries are one of the most frustrating causes of lameness in horses, especially in performance horses. They can look subtle at first, then quietly become the reason a horse will not track up, push from behind, stay sound in work, or return to competition.

The difficult part is that not all suspensory injuries behave the same way. A mild branch strain in one horse may recover well with controlled rehabilitation, while chronic hindlimb proximal suspensory desmopathy can be far more stubborn and may need advanced imaging, regenerative therapy, surgery, or a long-term management plan.

This article explains what suspensory ligament injuries are, why they heal slowly, how vets diagnose them, which treatment options are used, and what affects the chance of returning to work.

Quick Answer

A suspensory ligament injury is damage to the ligament that supports the fetlock and helps absorb force during movement. In horses, these injuries can range from mild fibre strain to severe tearing, chronic degeneration, or painful proximal suspensory desmopathy. Treatment depends on the location, severity, limb affected, chronicity, imaging findings, and the horse’s job, but usually involves controlled rest, progressive rehabilitation, farriery changes, and sometimes regenerative therapy or surgery.

What Is the Suspensory Ligament?

The suspensory ligament is a major support structure in the lower limb of the horse. It helps stabilise the fetlock during weight-bearing and contributes to the spring-like function of the equine limb during movement. It originates near the back of the cannon bone, runs down the limb, then divides into branches that attach near the sesamoid bones and continue toward the extensor tendon. (PMC)

Although it is called a ligament, the equine suspensory ligament is a specialised structure with features of tendon, ligament, and muscle. This matters because it carries huge mechanical loads, especially in horses doing fast work, jumping, dressage, cutting, reining, eventing, or repeated collected movements. (PMC)

Where Do Suspensory Injuries Happen?

Suspensory injuries are usually grouped by location:

The location matters because it changes the signs, diagnosis, treatment options, and prognosis. Hindlimb proximal suspensory injuries are often the most difficult, particularly when they are chronic or bilateral.

How Do Suspensory Ligament Injuries Happen?

Suspensory ligament injuries can happen suddenly, but many develop slowly.

Common causes include:

• Repetitive overload during training

• Fatigue-related microdamage

• Sudden overextension of the fetlock

• Poor hoof balance

• Inconsistent footing

• Fast work, jumping, sliding stops, collection, or tight turns

• Returning to work too quickly after earlier lameness

• Chronic degeneration within the ligament

In practice, the most frustrating cases are often not the dramatic “one bad step” injuries. They are the horses that slowly lose impulsion, start swapping leads, feel uneven behind, resist collection, or become “not quite right” before obvious lameness appears.

Why Do Suspensory Ligament Injuries Heal Slowly?

Ligaments heal slowly because they have limited blood supply compared with many other tissues. When damaged fibres repair, the body often lays down scar tissue. Scar tissue is useful for closing the gap, but it does not behave exactly like normal elastic ligament fibres.

That means the real goal is not just “make the ultrasound look better.” The goal is to rebuild enough organised, functional tissue so the horse can safely tolerate the forces of work again.

This is why rest alone is not enough in many cases. Too much movement too early can disrupt healing. Too little controlled loading for too long can leave the tissue weak and poorly conditioned. The annoying middle ground is where the magic happens, which is why rehab plans exist to ruin everyone’s patience.

How Worried Should You Be?

Mild

A mild suspensory injury may cause subtle lameness, mild swelling, a slight change in performance, or low-grade ultrasound changes.

These horses may still walk comfortably and may only show signs on a circle, under saddle, or during harder work.

Action: stop hard work and arrange a veterinary assessment. Mild does not mean ignore it.

Moderate

A moderate injury may cause clear lameness, heat, swelling, pain on palpation, reduced performance, or visible fibre disruption on ultrasound.

These cases usually need a structured rehabilitation plan, repeat imaging, and farriery review.

Action: controlled exercise only under veterinary guidance. Do not keep training through it.

Severe

A severe injury may involve marked lameness, obvious swelling, significant fibre tearing, dropping of the fetlock, or failure to improve with early treatment.

These cases may need advanced imaging, specialist referral, regenerative treatment, or surgery.

Action: treat as a significant injury. The horse should not be worked.

Chronic or High-Risk

Chronic hindlimb proximal suspensory desmopathy is a different beast. It may cause persistent or recurring lameness, poor performance, bilateral hindlimb issues, or pain that does not match obvious external swelling.

Action: these cases often need a deeper diagnostic plan, not just more rest.

When Is This an Emergency?

A suspensory ligament injury is not usually an emergency in the same way as colic or a fracture, but some signs need urgent veterinary attention.

Call a vet urgently if your horse has:

• Sudden severe lameness

• Refusal to bear weight

• A dropped fetlock

• Rapidly increasing swelling

• Severe pain

• Heat and swelling after a high-speed or jumping injury

• Suspected fracture, tendon rupture, or major soft tissue rupture

• Lameness that worsens over a few hours

The key point is this: a horse that is suddenly very lame should not be assumed to have “just a ligament strain.” Severe suspensory injuries, fractures, tendon injuries, joint injuries, abscesses, and other serious causes can look similar early on.

What Else Can Look Like a Suspensory Injury?

Suspensory injuries can mimic, or be confused with, several other causes of lameness.

Important differentials include:

• Hoof abscess

• Deep digital flexor tendon injury

• Superficial digital flexor tendon injury

• Check ligament injury

• Fetlock joint pain

• Proximal sesamoid bone injury

• Splint bone pain or fracture

• Hock pain

• Sacroiliac pain

• Stifle pain

• Foot imbalance or shoeing-related lameness

• Bone bruising or stress injury

• Neurological weakness or poor coordination

This is why a proper lameness work-up matters. Guessing based on location of swelling alone can send treatment in the wrong direction.

How Do Vets Diagnose Suspensory Ligament Injuries?

Diagnosis usually involves combining clinical signs, lameness examination, nerve blocks, and imaging. Suspensory injuries can be difficult to localise because pain may be subtle, bilateral, or worse under specific conditions such as circles, hard ground, soft ground, collection, or ridden work.

Common diagnostic steps include:

Lameness Examination

Your vet may assess the horse:

• In hand

• On a straight line

• On a circle

• On hard and soft surfaces

• After flexion tests

• Under saddle if the lameness is performance-related

Some suspensory cases are only obvious when the horse is worked in the way that triggers the problem.

Nerve Blocks

Diagnostic analgesia can help localise the source of pain. However, nerve blocks around the proximal suspensory region can be complex because nearby structures may also be affected by local anaesthetic spread. This is why nerve blocks are useful, but not perfect. (PMC)

Ultrasound

Ultrasound is commonly used to assess suspensory ligament size, fibre pattern, swelling, core lesions, branch injuries, and healing progression. It remains the main field imaging tool for many suspensory injuries. (PMC)

The limitation is that ultrasound can miss or underestimate some lesions, especially in the proximal suspensory region. Operator skill, limb position, anatomy, chronicity, and lesion location all matter.

MRI

MRI can be very useful when ultrasound does not explain the lameness, especially in proximal suspensory injuries or complex cases. MRI can detect changes that ultrasound may miss and can also identify nearby bone or soft tissue abnormalities. (PMC)

In rear-limb proximal suspensory disease, one study found ultrasound could underestimate the severity of damage compared with MRI, and MRI correlated better with histologic healing in that model. (IVIS)

Treatment Options for Suspensory Ligament Injuries

There is no single best treatment for every horse. The right plan depends on:

• Forelimb or hindlimb

• Proximal, body, or branch injury

• Acute versus chronic injury

• Mild strain versus fibre tear

• Ultrasound and MRI findings

• Whether one limb or multiple limbs are affected

• Hoof balance and conformation

• Discipline and performance goals

• Previous injury history

• Owner budget and available facilities

Rest and Controlled Exercise

The foundation of treatment is controlled rest followed by a progressive exercise program.

This usually includes:

• Initial rest from ridden work

• Controlled hand walking or controlled turnout when appropriate

• Repeat ultrasound or imaging checks

• Gradual increase in walking

• Later introduction of trot work

• Careful return to circles, canter, jumping, collection, or speed work only when appropriate

The biggest mistake is thinking “rest” means “do nothing for six months, then bring the horse straight back.” Ligament tissue needs progressive loading, but only at the right time and intensity.

Farriery and Hoof Balance

Hoof balance is not a side issue. It is part of treatment.

A farrier and vet may review:

• Mediolateral balance

• Toe length

• Heel support

• Breakover

• Fetlock support

• Limb conformation

• Surface and workload

Shoeing changes may reduce strain on the suspensory ligament, but they can also shift forces elsewhere in the limb, so they need to be planned carefully. (PMC)

Anti-Inflammatory Treatment

Anti-inflammatory treatment may be used early to control pain and inflammation, but it does not repair the ligament by itself.

Pain relief should not be used to keep a horse working through a suspected soft tissue injury. That is how a manageable injury gets promoted to a career-ending drama queen.

Shockwave Therapy

Extracorporeal shockwave therapy is used in some suspensory cases, particularly chronic proximal suspensory desmopathy. Some studies show promising effects, but the overall evidence is mixed, and the exact effect on ligament matrix healing remains unclear. (PMC)

Shockwave is best thought of as one possible part of a wider plan, not a magic wand.

Platelet-Rich Plasma

Platelet-rich plasma, or PRP, uses concentrated platelets from the horse’s own blood. Platelets release growth factors that may support tissue repair.

PRP has been used for suspensory injuries, but results vary between studies. Some horses return to work, but not all return to their previous level, and not all studies include control groups or long-term reinjury data. (PMC)

PRP may be considered when there is a suitable lesion to inject and a proper rehab plan to support it.

Bone Marrow and Stem Cell-Based Therapy

Bone marrow aspirate, bone marrow-derived mesenchymal stem cells, and other stem cell-based therapies aim to improve the quality of tissue repair rather than simply filling the injury with scar tissue.

Evidence is still developing, but several studies show promising results. In one experimental study, intralesional bone marrow-derived mesenchymal stem cells improved the structural organisation of healing proximal suspensory ligament tissue compared with rest alone. (IVIS)

A larger clinical study using tenogenic primed mesenchymal stem cells in PRP reported that 82.4% of suspensory ligament cases returned to previous performance level at 24 months, with a 17.6% reinjury rate, although the study design and control limitations still matter when interpreting results. (Frontiers)

More recent review data also suggests stem cell-based treatments are promising, but not every product, protocol, or case type has the same level of evidence. (PMC)

Fasciotomy and Neurectomy

For chronic hindlimb proximal suspensory desmopathy, surgery may be considered.

The two procedures commonly discussed are:

• Fasciotomy, which releases tight fascia over the proximal suspensory region

• Neurectomy, which targets the deep branch of the lateral plantar nerve supplying the proximal suspensory region

The theory is that some horses have pain related to compression, chronic inflammation, or nerve involvement around the proximal suspensory ligament.

A 2025 retrospective study of 141 horses compared desmoplasty with fasciotomy against deep branch lateral plantar neurectomy with fasciotomy for hindlimb proximal suspensory desmopathy. Long-term outcomes were available for 109 horses, with no significant difference between the two techniques in lameness resolution or return to work. Reported return to work at 1 to 3 years was 83% for desmoplasty with fasciotomy and 93% for neurectomy with fasciotomy. Serious operative complications were not reported, but three horses developed excessive suspensory laxity and dropped fetlocks. (PMC)

This is important because surgery can help selected horses, but it is not a casual decision. It needs a correct diagnosis, imaging, specialist input, and a realistic discussion about competition rules, reinjury risk, and long-term soundness.

Recovery Timeline

Suspensory ligament recovery is slow. Even with advanced treatment, horses usually need months, not weeks.

A rough guide:

Some horses improve clinically before the ligament is ready for full work. That is the trap. Sound at walk or trot does not always mean ready for canter, jumping, sliding stops, deep footing, or collection.

Repeat imaging is often used to guide progression. The calendar matters, but the tissue matters more.

What Should You Do Next?

If you suspect a suspensory ligament injury:

1. Stop ridden work and high-speed exercise.

2. Confine the horse safely if lameness is obvious.

3. Check for heat, swelling, wounds, or a dropped fetlock.

4. Contact your vet for a lameness assessment.

5. Do not give pain relief just to keep riding.

6. Arrange imaging if your vet suspects soft tissue injury.

7. Review hoof balance with your vet and farrier.

8. Follow a written rehabilitation plan.

9. Recheck before increasing workload.

10. Track subtle signs such as unevenness, reluctance to collect, shortened stride, swelling after work, or recurring lameness.

The key decision point is simple: if the horse is lame, swollen, or not performing normally, do not train through it and hope the ligament toughens up. Ligaments are not motivational speakers.

Common Mistakes Owners Make

Turning the Horse Out Too Early

Large paddock turnout can undo early healing if the horse gallops, bucks, spins, or plays.

Returning to Work Because the Horse Looks Sound

A horse can look better before the ligament has regained enough strength for full work.

Skipping Repeat Imaging

Without rechecks, you are guessing whether the tissue is healing or just temporarily less painful.

Ignoring Hoof Balance

Poor hoof balance can keep loading the same injured structure.

Treating Every Suspensory Injury the Same

A branch injury, body lesion, and chronic hindlimb proximal suspensory problem are not identical.

Thinking Advanced Therapy Replaces Rehab

Stem cells, PRP, shockwave, or surgery do not cancel the need for controlled rehabilitation.

Can Suspensory Injuries Be Prevented?

Not every suspensory injury can be prevented, but risk can be reduced.

Useful prevention steps include:

• Maintain regular farrier care

• Avoid long toes and poor hoof balance

• Build fitness gradually

• Avoid sudden spikes in workload

• Use suitable surfaces where possible

• Be careful with deep, slippery, or inconsistent footing

• Warm up properly

• Monitor small changes in performance

• Investigate recurring low-grade lameness early

• Give adequate recovery after hard work

• Do not push through subtle changes in stride, impulsion, or willingness

For performance horses, the early signs are often whispered before they are shouted. A horse that starts feeling “flat,” uneven, resistant, or less powerful behind is telling you something. Annoying? Yes. Useful? Very.

Will My Horse Return to Work?

Many horses can return to work after a suspensory injury, but the prognosis depends heavily on the case.

Better prognosis is associated with:

• Mild or early injury

• Clear diagnosis

• Good hoof balance

• No major fibre disruption

• No severe chronic degeneration

• Good owner compliance

• Controlled rehab

• Appropriate workload expectations

More guarded prognosis is associated with:

• Hindlimb proximal suspensory desmopathy

• Chronic or recurrent injury

• Bilateral hindlimb involvement

• Severe fibre disruption

• Fetlock dropping

• Poor conformation

• Returning to work too quickly

• High-level performance demands

The most honest answer is this: some horses return to full competition, some return at a lower level, and some need a career change. The earlier the injury is recognised and managed properly, the better the odds usually are.

FAQs

Can a horse recover from a suspensory ligament injury?

Yes, many horses recover, but recovery depends on the location and severity of the injury. Mild injuries may return well with controlled rehab, while chronic hindlimb proximal suspensory injuries can be much harder to resolve.

How long does a suspensory ligament injury take to heal?

Most suspensory injuries take months. Mild cases may take 3 to 6 months, while moderate, severe, chronic, or surgical cases may need 6 to 12 months or longer.

Is a suspensory ligament injury career-ending?

Not always. Some horses return to their previous level of work, especially with early diagnosis and careful rehabilitation. Severe or chronic cases may require a lower-level job or retirement from high-impact competition.

Is stem cell therapy worth it for suspensory injuries?

Stem cell therapy may help selected cases, especially where there is a clear lesion and a proper rehabilitation plan. It is not a guaranteed fix, and the evidence varies depending on the type of stem cell product, injury type, and study design.

Should I get an MRI for a suspensory injury?

MRI can be very useful when lameness persists but ultrasound does not explain the problem, especially in proximal suspensory injuries. Ultrasound is often the first imaging step, but MRI may provide a clearer diagnosis in difficult cases.

Final Thoughts

Suspensory ligament injuries are serious because they affect one of the horse’s key support structures. The injury itself matters, but so does the location, the limb involved, the horse’s job, the imaging findings, and how carefully the rehabilitation is managed.

The best outcomes usually come from early diagnosis, realistic expectations, good farriery, controlled loading, repeat assessment, and choosing advanced treatments only when they genuinely fit the case.

A suspensory injury is not automatically the end of a horse’s career. But it is a very good reason to slow down, investigate properly, and make decisions based on tissue healing rather than hope.

If your horse has suspected suspensory ligament injury, ongoing lameness, or confusing imaging results, ASK A VET™ can help you understand what the findings mean and what questions to ask your treating vet before the next stage of treatment or rehabilitation.