# Ankle equinus

> Ankle equinus is limited upward bending of the ankle, often from tight calves. Guided stretching, strengthening and footwear come first; later surgery suits some adults.

Guide in [Foot shape and posture](https://footanklelowerlimb.com.au/learn/topics/foot-shape-and-posture), from Foot Ankle Lower Limb: https://footanklelowerlimb.com.au/learn/ankle-equinus
Reviewed by Andrew Schox, BSc(Hons) PGradDipPod MPod (Podiatrist) on 1 November 2026.
Next review by 1 November 2027.

- **It's limited upward ankle bending,** often from tight calf muscles.
- **It can be subtle,** so you may not notice it.
- **Guided stretching, strengthening and footwear come first,** and are often enough.
- **Surgery is a later option** for some adults, with real trade-offs.

## What is ankle equinus, and how common is it?

Ankle equinus (also called equinus deformity) means less upward bending of the ankle (dorsiflexion), often from tight calf muscles [1]. No agreed amount of lost movement defines it: cut-offs of under 10, under 5 and under 0 degrees are all used [2]. In otherwise healthy people, the non-neuromuscular form is often called subtle or silent [3]. It is very common among people who go to a podiatric clinic with a new foot or ankle problem [1], but how common it is in the general population isn't known.

## What causes ankle equinus, and who gets it?

Ankle equinus can come from tight or contracted calf muscles or surrounding soft tissues, bony restriction, or nerve and muscle conditions [4]. In children, cerebral palsy and idiopathic toe walking (no clear cause) are the most common causes [4]. In adults with diabetes, equinus goes with slightly higher foot pressure, a link rather than proof it causes ulcers [5]. With diabetes, mention reduced ankle movement at your regular foot check.

## What does it feel like, and how is it diagnosed?

Ankle equinus can be diagnosed on a physical examination [4]; when idiopathic toe walking is suspected and there is no developmental delay or abnormal neurological finding, imaging is generally unnecessary [4]. A clinician measures how far your ankle bends upward with the knee straight, then bent, holding the foot neutral [4]. This helps tell a tight gastrocnemius (the main calf muscle) from a tight whole calf group [4]. The weight-bearing lunge test, where you lean forward over your foot, gives consistent results between clinicians [6]. In children with idiopathic toe walking, reduced ankle movement is linked with trouble keeping the heels down when squatting [7]. A podiatrist also checks other causes of a stiff ankle, such as posterior ankle impingement, rather than assuming simple calf tightness [4].

## What helps first?

A guided stretching and strengthening programme from a physiotherapist or podiatrist, with gait training and home exercises, is the usual first step [4]. When the ankle is still flexible, it's often all that's needed [4]. Stretching may help, though it isn't clear whether it helps adults with diabetes and equinus any more than usual activity [3][8]. No set dose is given [4]. Avoid flat shoes; rocker-soled shoes may be suggested [9]. If you have diabetes and are at risk of foot ulcers, have both feet checked before you start exercising [10].

## What helps if that isn't enough?

If stretching and physiotherapy haven't helped, ask whether a tight gastrocnemius is the problem and whether referral to a foot and ankle surgeon is right. Calf-lengthening surgery (gastrocnemius recession) is most likely to help adults when the problem is chronic plantar fasciitis with a tight gastrocnemius [11]; it is less clear whether it helps other adult foot problems [12]. Calf-lengthening surgery is an established option that often helps children with cerebral palsy [12]. Risks such as calf weakness and nerve injury are uncommon but real [13], so ask about them. With diabetes, asthma or high blood pressure, expect a pre-operative assessment visit.

## How long does it take to get better, and can it come back?

When the ankle is still flexible, guided stretching and home exercise often settle it [4]. Keep up the exercises your clinician sets, and ask for a review point; how long recovery takes isn't clear yet. Stretching isn't known to stop it coming back [3]. After calf-lengthening surgery it recurs in about 1 in 20 people, usually milder, and most return to usual activity within 3–4 months, building up gradually [14]. With diabetes, well-fitting protective footwear, and never walking without foot protection, help prevent ulcers [15].

## What can make it serious?

- You have new numbness, tingling, pins and needles or weakness in your foot that has come on gradually.
- Your child walks on tiptoe and also can't stand with heels down, has one side different from the other, has very bulky calves, or seems unusually stiff or unsteady.
- Your pain is getting worse, or doesn't settle with rest, less activity or pain relief.
- You have lost weight without trying.
- You have pain at night or at rest that doesn't settle.
- Your cast is loose, too tight, cracked, dented, soft, wet or smelly, is rubbing, or has discharge or blood coming through it.
- You have had foot surgery and the wound opens, keeps bleeding or starts to leak.
- You have diabetes, poor circulation or reduced feeling in your feet and notice a new wound, sore, blister or colour change on your foot, or a sore that isn't healing.
- You have diabetes or reduced feeling in your feet and one foot becomes red, hot or swollen, or suddenly changes shape, even if it doesn't hurt (possible Charcot foot).
- You feel a sudden snap or pop at the back of your ankle or calf, as if you were kicked, and then find it hard to push off or stand on tiptoe.

## Common questions

### Why does my child walk on their toes?

The most frequent causes of equinus in children are cerebral palsy and idiopathic toe walking, where no clear reason is found. Toe walking is much more common in children with developmental delays. Children with idiopathic toe walking often show differences in sensory processing, but it isn't clear whether these differences cause the toe walking or result from it.

### Can equinus cause plantar fasciitis or other foot pain?

Possibly, but it isn't clear yet. A tight gastrocnemius may be behind many non-traumatic acquired foot and ankle problems in adults, and obesity, a sedentary lifestyle, footwear and concrete floors may work mainly by tightening the calf. It isn't clear yet whether this is the case.

### What is the difference between a tight gastrocnemius and a tight soleus?

Ankle bending is compared with the knee straight and then bent. Less than 5° of upward bending with the knee straight but more than 10° with it bent suggests a tight gastrocnemius. Less than 10° with the knee bent suggests the whole calf group is tight.

## Further reading

- [Ankle equinus on Clindice](https://clindice.com/ankle-equinus)
- [Contracture: How Temporary Immobilization Can Permanently Affect Your Mobility](https://my.clevelandclinic.org/health/diseases/contracture), Cleveland Clinic
- [G-care: The primary care clinical information system](https://g-care.glos.nhs.uk/clinical-topic/foot-and-ankle-pain), NHS
- [Equinus - Foot Health Facts](https://www.foothealthfacts.org/conditions/equinus), FootHealthFacts (American College of Foot and Ankle Surgeons)
- [Ankle pain](https://www.nhs.uk/symptoms/foot-pain/ankle-pain/), NHS
- [Achilles tendon rupture: management and rehabilitation](https://www.royalberkshire.nhs.uk/media/55qlyrup/achilles-tendon-rupture-conservative-management_oct25.pdf), NHS

## Sources

1. Ankle Equinus · PubMed. https://pubmed.ncbi.nlm.nih.gov/39163432/
2. Interventions for increasing ankle joint dorsiflexion: a systematic review and meta-analysis · Young R, Nix S, Wholohan A et al. · Journal of Foot and Ankle Research · 2013. https://doi.org/10.1186/1757-1146-6-46
3. The Split Second Effect: The Mechanism of How Equinus Can Damage the Human Foot and Ankle · Amis J · Frontiers in Surgery · 2016. https://doi.org/10.3389/fsurg.2016.00038
4. Ankle Equinus · Robinson JM, Mielke CH · NCBI Bookshelf · 2024. https://www.ncbi.nlm.nih.gov/sites/books/NBK606130/
5. Association between ankle equinus and plantar pressures in people with diabetes. A systematic review and meta-analysis · Searle A, Spink MJ, Ho A et al. · Clinical Biomechanics (Bristol, Avon) · 2017. https://doi.org/10.1016/j.clinbiomech.2017.01.021
6. Reliability and minimal detectable change of the weight-bearing lunge test: A systematic review · Powden CJ, Hoch JM, Hoch MC · Manual Therapy · 2015. https://doi.org/10.1016/j.math.2015.01.004
7. Sensory Processing Differences in Children With Idiopathic Toe Walking: A Scoping Review and Exploratory Meta-Analysis · Chu VWT, Rolin OY, Girolami GL et al. · The American Journal of Occupational Therapy · 2026. https://doi.org/10.1177/19437676261464097
8. Calf muscle stretching is ineffective in increasing ankle range of motion or reducing plantar pressures in people with diabetes and ankle equinus: A randomised controlled trial · Searle A, Spink MJ, Oldmeadow C et al. · Clinical Biomechanics (Bristol, Avon) · 2019. https://doi.org/10.1016/j.clinbiomech.2019.07.005
9. Ankle Conditions in Adults - Non-Acute (Non-Traumatic) - South & West · South & West. https://southwest.devonformularyguidance.nhs.uk/referral-guidance/western-locality/musculoskeletal/ankle-conditions-in-adults-non-acute-non-traumatic
10. Consensus-based recommendations on physical activity and exercise in patients with diabetes at risk of foot ulcerations: a Delphi study · Gracia-Sánchez A, López-Pineda A, Lázaro-Martínez JL et al. · Brazilian Journal of Physical Therapy · 2023. https://doi.org/10.1016/j.bjpt.2023.100500
11. Outcomes After Proximal Medial Gastrocnemius Recession and Stretching vs Stretching as Treatment of Chronic Plantar Fasciitis at 6-Year Follow-up · Riiser MO, Husebye EE, Hellesnes J et al. · Foot & Ankle International · 2024. https://doi.org/10.1177/10711007231205559
12. Gastrocnemius recession for foot and ankle conditions in adults: Evidence-based recommendations · Cychosz CC, Phisitkul P, Belatti DA et al. · Foot and Ankle Surgery · 2015. https://doi.org/10.1016/j.fas.2015.02.001
13. Outcomes and Incidence of Complications Following Endoscopic Gastrocnemius Recession: A Systematic Review · Brandão RA, So E, Steriovski J et al. · Foot & Ankle Specialist · 2021. https://doi.org/10.1177/1938640019892767
14. Calf Lengthening Surgery · Mallard A · Royal Orthopaedic Hospital. https://roh.nhs.uk/services-information/foot-and-ankle/calf-lengthening-surgery
15. Guidelines on the prevention of foot ulcers in persons with diabetes (IWGDF 2023 update) · Bus SA, Sacco ICN, Monteiro-Soares M et al. · Diabetes/metabolism Research and Reviews · 2024. https://doi.org/10.1002/dmrr.3651

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This is general information, not advice about your own situation. To discuss your issues, book with one of our podiatrists. In an emergency, call 000.