Wind Surgery in Horses: What You Need to Know

Wind surgery in horses — a wind op, in yard shorthand — is the umbrella term for a group of procedures that aim to improve a horse’s upper airway function during exercise. At rest, a horse needs relatively little air. At full gallop, a Thoroughbred can move around 1,500 litres of air through its airway every minute. Any obstruction — collapsed cartilage, displaced soft palate, paralysed laryngeal flap — and the horse fades, makes abnormal noise, or struggles to recover. Wind surgery is designed to give that airway back its full diameter.

This guide covers what the major procedures actually do, how vets diagnose wind problems, what the British Horseracing Authority’s “WS” declaration on a racecard means, the non-surgical options worth exhausting first, recovery and aftercare timelines, wind op costs in the UK and South Africa, and the realistic odds of a return to form after surgery.

How a horse’s airway works (and where it fails)

A long airway designed for a flat-out gallop

A horse is an obligate nasal breather — it cannot breathe through its mouth. Air travels through the nostrils, the nasopharynx, past the soft palate, through the larynx, and down the trachea to the lungs. At a gallop, the larynx must stay open, the soft palate must stay below the epiglottis, and every tube must be wide and stable. Any failure here costs oxygen.

Why the left side of the larynx is the usual culprit

The most common single cause of upper airway obstruction is recurrent laryngeal neuropathy (RLN) — dysfunction of the left recurrent laryngeal nerve, which controls the left arytenoid cartilage. When the nerve degenerates, the muscle that opens the left side of the larynx (the cricoarytenoideus dorsalis) wastes away. The left arytenoid drifts into the airway during exercise and the horse makes a “roaring” noise on inhalation. This is the condition behind the term equine laryngeal hemiplegia. RLN affects up to 8% of Thoroughbreds and is more common in tall horses with long necks, including the Warmbloods used in eventing.

Soft palate and pharynx problems

The second-most-common upper airway problem is dorsal displacement of the soft palate (DDSP), in which the soft palate slips above the epiglottis during exercise. Air then turns turbulent, the horse makes a low “gurgling” noise, and oxygen delivery drops sharply. DDSP is rarely a degenerative condition; it is mechanical and intermittent.

Other structures in the same neighbourhood can obstruct the airway too — inflammation of the throat as seen in equine pharyngitis, or distension of the air sacs behind the skull in guttural pouch tympany. These are not fixed by wind surgery, which is exactly why diagnosis comes before any decision to operate.

Signs of a wind problem

Noisy breathing — roaring, whistling, gurgling

Noise is the most-cited reason owners ask about wind surgery. The three classic descriptions:

• Roaring — a deep, throat-rattling inhalation sound, typical of left-laryngeal hemiplegia (a horse roarer).
• Whistling — a higher-pitched inhalation noise, often a lesser form of the same condition.
• Gurgling — a wet, intermittent noise heard during fast exercise, typical of DDSP.

Noise alone is not a diagnosis. Some horses are noisy but well-oxygenated; others are silent but losing meaningful airflow.

Performance drops and late-race fading

A horse that travels sweetly through the early part of a race or piece of work, then suddenly “hits a wall” in the final furlong, is a wind-suspect. So is a horse that takes much longer than normal to recover its respiratory rate after fast work. Trainers often describe these horses as “travelling then stopping.”

Changes in head carriage and stride

Airway restriction can drive subtle changes in posture. A horse that suddenly drops onto the forehand, throws its head, or becomes tense during canter transitions may be reacting to breathing discomfort. The clue is that the change tracks with effort — not with the schooling environment, the rider, or the day’s mood. Be careful not to assume the airway is at fault: persistent head-tossing has its own separate differential, covered in our guide to headshaking in horses.

Ruling out the lower airway

Wind surgery addresses the upper airway. A horse coughing at the start of work, struggling in dusty stabling, or breathing hard at rest is more likely to have a lower-airway problem — see equine asthma, heaves or allergies. Bleeding after fast work points instead towards epistaxis. No wind op will help any of these.

How wind problems are diagnosed

Resting endoscopy (“scoping”)

The first step is usually a resting endoscopic examination. The vet passes a flexible camera up the nostril to view the larynx, the soft palate, the epiglottis and the pharynx. Laryngeal function at rest is graded on a standard I–IV scale (the Havemeyer scale), with grades II and III commonly subdivided to describe how much abduction is lost:

Overground (dynamic) endoscopy

Resting scopes can miss problems that only appear at speed. Modern UK and South African referral hospitals use overground endoscopy: a small camera and recording unit mounted on the bridle while the horse is exercised at full intensity. This is the gold standard for diagnosing DDSP and dynamic collapse of laryngeal structures. Treadmill endoscopy is the older equivalent and is still used at some university hospitals.

Why the diagnosis dictates the surgery

The choice of procedure depends entirely on what is actually collapsing. A horse with Grade IV laryngeal hemiplegia and a horse with DDSP both make noise, but the surgeries that help them are completely different. Operating on the wrong structure is the most common reason wind surgery fails to deliver improvement.

Before you book a wind op: conservative management

Rule out the non-airway causes first

Soft palate displacement in particular is frequently secondary to something else entirely. Peasebrook Equine Clinic lists immaturity and simple lack of fitness as common causes in young horses, alongside heavy ground that brings on early fatigue, viral infection, tying-up, cardiac problems such as atrial fibrillation, and any orthopaedic problem causing pain or lameness. Their advice is blunt: do not rush into surgery before ruling these out.

Age matters here as well. A three-year-old still filling out is a very different proposition from an eight-year-old whose form has tailed off — our guide to horse life stages is a useful sense-check before committing to theatre.

Tack and management changes worth trying

• Get the horse genuinely fit and free from lameness before judging its wind.
• Race or work on better ground where possible, and avoid asking the horse to front-run and empty itself early.
• Fit a drop or crossed noseband to keep the mouth closed — an open mouth during fast work is thought to destabilise the seal between the soft palate and the base of the tongue.
• Try a tongue-tie, which works on the same principle of holding the tongue base in position.

None of this helps a Grade IV roarer — a paralysed larynx will not be managed back to health. But for intermittent gurglers, conservative management resolves a meaningful proportion of cases without a general anaesthetic.

The main types of wind surgery

Tie-back (prosthetic laryngoplasty)

The tie-back is the standard surgical fix for Grade III–IV laryngeal hemiplegia (the typical roarer). Under general anaesthesia, a non-absorbable suture is passed through the cricoid cartilage and the muscular process of the left arytenoid, then tightened to hold the arytenoid in an abducted (open) position permanently. It is the most effective surgery for restoring airway diameter in a paralysed larynx, with reported success rates in the region of 60–70% for return to previous performance level in racehorses, and higher in non-racing horses where airway demand is lower.

Hobday (ventriculectomy and cordectomy)

Named after the British veterinary surgeon Sir Frederick Hobday, who popularised the technique in the early twentieth century, the Hobday procedure removes the laryngeal ventricle (and often the vocal cord) on the affected side. The aim is to reduce the soft-tissue mass projecting into the airway and to cut down inspiratory noise. It is most useful for low-grade laryngeal disease and is often performed alongside a tie-back. Done alone, it reduces noise more reliably than it improves performance.

Tie-forward (laryngeal tie-forward)

The tie-forward is the standard procedure for DDSP and was introduced in 2003. Sutures are placed to pull the larynx forward and upward so that the basihyoid bone is closer to the thyroid cartilage. This stabilises the relationship between the larynx and soft palate during exercise. Reported success rates are around 80% for return to racing soundness in horses confirmed with DDSP on dynamic endoscopy.

Epiglottic entrapment surgery

In epiglottic entrapment, the loose membrane beneath the epiglottis folds up over it, blunting its outline and disturbing airflow and palate function. The correction is to divide the trapping tissue, often with a laser and frequently with the horse standing under sedation. It is one of the five procedures the BHA requires trainers to declare, and it is worth knowing about because it is easy to miss on a poor-quality resting scope.

Soft palate cautery (palatoplasty)

Laser or thermal cautery of the soft palate produces scar tissue, which stiffens the palate and reduces its tendency to billow and displace. The procedure can be performed standing under sedation, carries little risk and lets the horse stay in training, which is why it is widely used in the UK. The trade-off is durability: Peasebrook notes the effect may last only nine to ten months, so the surgery often needs repeating.

Sternothyroid myectomy — the older option

An older procedure also used for DDSP, the sternothyroid myectomy cuts the sternothyroid tendon, which is thought to allow the larynx to sit higher in the throat. It is less effective than the tie-forward and is now used less often, though it still appears in mixed surgical packages. Note that it is not the same thing as a staphylectomy, which is a resection of the soft palate itself — the two are sometimes wrongly used interchangeably.

What “WS” means on a racecard (BHA rules)

The 2018 declaration rule

Since 19 January 2018, the British Horseracing Authority has required trainers to declare wind surgery, with racecards displaying “WS” to identify a horse that has had new wind surgery since last performance. The BHA introduced it explicitly for the betting public: the Horserace Bettors Forum had identified wind-op data as the single most requested piece of missing information. You can read the BHA’s own announcement of the rule for the full detail.

The five surgeries a trainer must declare

The BHA identified a specific list of five procedures as the most relevant and frequent, and it is these that must be declared:

• Tie back (prosthetic laryngoplasty)
• Hobday (ventriculectomy/cordectomy)
• Epiglottic surgery
• Tie forward (dorsal displacement soft palate surgery)
• Soft palate cautery

Anything outside that list — a sternothyroid myectomy performed on its own, for instance — does not trigger the declaration.

When the “WS” disappears — and when it comes back

The WS notation appears only for the horse’s first race start following the surgery, and not for subsequent starts, even though the surgery is permanent and stays on the veterinary record. Because the flag is defined as “new wind surgery since last performance”, a horse that has a second operation later in its career will carry WS again on its first start after that procedure. In other words the indicator resets rather than expiring for good — there is no separate code for a repeat operation.

South Africa has no equivalent racecard declaration system; veterinary records remain with the trainer and the National Horseracing Authority.

How to check which horses have had a wind op today

If you want to see the day’s declarations rather than scan individual racecards, At The Races publishes a filtered list of today’s wind surgeries. It is the quickest way to spot first-time-after-surgery runners across the card.

Does a wind op improve performance?

The honest answer: it depends on the diagnosis

The regulator’s own position is deliberately non-committal. Announcing the declaration rule, BHA Director of Equine Health and Welfare David Sykes said it is “understood that not all wind surgeries are successful…but some clearly are”, and that assumptions about the effect on a horse’s form “should rest entirely with the betting customer”. The BHA published the data precisely because the outcome is not predictable enough to generalise.

Nor is any single procedure a guarantee. Peasebrook Equine Clinic’s assessment of soft palate surgery is that no one surgical procedure achieves a success rate of anything much above 70% — and that is for a correctly diagnosed, appropriately selected case. Treat any claim of a reliable form turnaround with suspicion.

The practical read: a wind op corrects a mechanical fault. If the fault was genuinely the thing limiting the horse, the horse improves. If the horse was slow, sore or over the top for other reasons, fixing its airway changes very little.

Where wind surgery genuinely helps

The horses that benefit most are usually:

• Young Thoroughbreds with confirmed Grade III–IV RLN on dynamic endoscopy.
• Horses with DDSP confirmed dynamically and corrected by tie-forward.
• Eventers and showjumpers asked for repeated short, intense bursts at the upper end of effort.
• Endurance horses where airway restriction limits aerobic recovery.

Wind surgery pros and cons at a glance

Recovery, aftercare and return to work

Hospitalisation and immediate post-op

Most wind-surgery patients spend three to seven days hospitalised after a tie-back or tie-forward. Pain relief, antibiotics, and box rest are standard. Coughing during the first one to two weeks is common with a tie-back because the larynx no longer closes fully to protect the airway during swallowing — managing this with soaked feed and a slow introduction of haylage matters.

A typical return-to-work schedule

Long-term aftercare

Tie-back horses need careful feeding management for life: soaked hay or haylage, no dust, slow eating, and a watch for aspiration pneumonia. Dental work to control sharp edges that might cause coughing matters too. Most horses return to a normal life, but the airway is no longer protected from food in the same way as an intact larynx.

Wind op costs in the UK and South Africa

UK

Indicative prices at UK equine referral hospitals. Quotes vary considerably by hospital and by how long the horse stays in, so treat these as a planning range rather than a price list:

South Africa

South African referral practices typically charge between R30,000 and R80,000 for the major procedures, with overground endoscopy adding roughly R8,000 to R15,000. As in the UK, hospitalisation length and whether a combined Hobday and tie-back is performed drive most of the variation.

What insurance covers

Cover varies. Many UK policies will pay for wind surgery performed on a referral basis, but require pre-authorisation and a recent veterinary report. Get the diagnosis and the referral in writing before the horse goes to theatre — a wind op booked without pre-authorisation is a common reason for a declined claim.

Risks and limitations

Surgical complications

The most common complications are:

• Aspiration pneumonia — uncommon, but the most serious complication of a tie-back. The protective laryngeal closure is gone, and food can be inhaled.
• Coughing at feeding — common in the early post-op period; usually settles with soaked feed.
• Suture failure — if the laryngoplasty sutures loosen or break, the arytenoid drifts back and the noise returns.
• Wound infection — uncommon, generally managed with antibiotics.
• Persistent gurgling after tie-forward — sometimes the soft palate continues to displace under maximum effort, especially if a Hobday and palatoplasty are not combined.

Honest expectations

Wind surgery is best understood as one tool among many. A horse with a clear, dynamically-confirmed airway problem and a fitness reserve to draw on will usually benefit. A horse that has lost form for multiple reasons — age, soundness, training stress — rarely runs to a new level after wind surgery alone. The cleanest results come from accurate diagnosis, a procedure matched to the lesion, and patient aftercare.

Frequently asked questions

Does wind surgery help a horse?

It helps when there is a confirmed mechanical obstruction and the procedure matches the lesion. A tie-forward for dynamically confirmed DDSP, or a tie-back for Grade III–IV laryngeal hemiplegia, will usually restore airflow. It does not help a horse whose problem is fitness, soundness, age or lower-airway disease, and no single procedure reliably exceeds about a 70% success rate.

What are the symptoms of a wind problem in horses?

Abnormal inspiratory noise (roaring, whistling or gurgling) during fast work, fading in the closing stages of a race or gallop, an unusually long recovery of breathing rate after exercise, and sometimes changes in head carriage that track with effort. Noise on its own is not diagnostic — an endoscopic examination is needed.

What is the difference between a Hobday and a tie-back?

A Hobday removes the laryngeal ventricle (and often the vocal cord) on the affected side and is mostly aimed at reducing noise. A tie-back uses permanent sutures to hold the arytenoid cartilage in an open position, restoring airway diameter. The two procedures are often performed together — Hobday for noise reduction, tie-back for airflow.

How long is a horse out of work after wind surgery?

Most horses return to racing or full competition between 8 and 12 weeks after surgery, with the first 4 weeks spent in box rest and controlled walking. Hard galloping work resumes from around week 6.

Will a horse always make less noise after wind surgery?

Usually yes for a Hobday or a tie-back, but a small amount of residual noise is common and not necessarily a sign that the surgery has failed. Performance and airway function matter more than the residual sound.

Does wind surgery affect resale value?

It depends on the buyer’s market. In British racing the “WS” declaration is public on the first run after surgery, and serious buyers treat it as routine due diligence. For non-racing buyers in eventing, dressage or showjumping, a successful wind op is generally not a deal-breaker provided the horse is performing well — but full disclosure on the veterinary record is essential.

Can wind surgery be reversed?

A tie-back is technically reversible — the sutures can be cut out — but the arytenoid often does not return to full function, particularly in older or chronically affected horses. A Hobday is not reversible because the tissue is removed. Decisions should be made with realistic expectations about permanence.