The big toe can stop bending down for several quite different reasons, from a pinned or torn tendon to a stiff, worn joint or scar tissue after surgery. Curling it relies on a tendon running from the calf and a short muscle inside the foot, and the two share the work unevenly.1The FASEB Journal. How Important is the Big Toe?: Functional Anatomy of Hallux Flexion Where the toe stops bending, at the tip or at the base, is a strong clue to which part has failed. Most of these problems ease with focused exercise and footwear changes, while surgery is kept mainly for tears. A sudden, complete loss of tip bending after a strain or injury can mean a torn tendon and needs prompt assessment.
What Normally Bends Your Big Toe Down
The flexor hallucis longus (FHL), which you can think of as the long toe-bending tendon, starts in the back of the calf and runs behind the inner ankle to the tip of the big toe. A shorter muscle inside the sole attaches near the base of the toe. So the long tendon mainly bends the tip joint, while the short muscle mainly bends the base joint where the toe meets the foot.
Because the long tendon travels so far, trouble at the ankle can stop the toe bending. It passes through a narrow tunnel behind the inner ankle bone, and anything that pinches or scars it there limits the toe far away.
The two muscles work in different moves. When you grip with your toes, curling them like a claw, the long tendon does nearly all the work, often near its maximum effort.2Acta of Bioengineering and Biomechanics. Contributions of flexor hallucis longus and brevis muscles to isometric toe flexor force production When you press the toes flat into the floor, as when pushing off, the short muscle carries more of the load.3Acta of Bioengineering and Biomechanics. Contributions of flexor hallucis longus and brevis muscles to isometric toe flexor force production A person can therefore push off fairly normally yet be unable to curl the tip, or the reverse.
Which Part of the Toe Won’t Bend Tells You a Lot
Start with a simple check. Hold the base of the big toe still with your fingers and try to curl only the tip. If the tip won’t move at all but the base still bends, the long tendon is the likely problem.4PubMed Central. Closed atraumatic complete rupture of the flexor halluces longus tendon during forward lunge exercise Do the tip-versus-base check sitting, with the foot relaxed and the ankle neutral, because pointing the ankle up or down changes how far the toe seems to curl and can fool you. Compare with the other foot first, since people differ in how far their toes naturally bend and your healthy side is your best baseline.
Two other checks look at the foot’s own muscles. In a paper-grip check, you press a slip of paper under the big toe while someone pulls it; if the short muscle is weak, the tip curls hard before the paper slips away.5International Journal of Leprosy. The Paper Grip Test for Screening on Intrinsic Muscle Paralysis in the Foot of Leprosy Patients You can also stand and push all your toes into the floor. A crease in the smaller toes is one sign the foot’s own muscles are working well, and no crease may suggest the arch muscles are weak too.6humanlocomotion.com. Why Can’t I Bend My Big Toe Down? Causes and Treatment
Next, separate weak from blocked. If someone else can bend your toe down easily but you can’t, the muscle or tendon isn’t pulling. If the toe feels mechanically stuck, or hurts at the joint whatever you try, the joint or scar tissue is more likely the cause. A toe that locks bent and snaps free with clicking at the back of the ankle points to a trapped long tendon.7PubMed Central. Posterior Ankle Arthroscopy for Flexor Hallucis Longus Entrapment: A Case Report
Your history adds clues. A sudden pop or sharp pain during a lunge, jump or sprint suggests a tear. A gradual loss with ankle ache suggests irritation or trapping of the tendon. Stiffness after bunion or ankle surgery points to scar tissue, and toe-joint stiffness that worsens slowly over years suggests arthritis.
See a doctor promptly if you suddenly can’t bend the tip at all after an injury, or if you notice swelling, bruising under the foot, or numbness. Early repair of a fresh tear is usually simpler than repairing an old one. These home checks only narrow the possibilities, so a result pointing to the tendon is a reason to get examined, not to start treating yourself.
Tendon Tears and Trapped Tendons
A fresh tear of the long tendon usually causes sudden pain at the injury spot and an inability to bend the toe tip.8Foot and Ankle Surgery. Chronic rupture of flexor hallucis longus tendon in a world class runner In one reported case, it tore during an ordinary forward lunge, with no fall or blow.9PubMed Central. Closed atraumatic complete rupture of the flexor halluces longus tendon during forward lunge exercise The base of the toe still bent, only weaker, because the short muscle was intact.10PubMed Central. Closed atraumatic complete rupture of the flexor halluces longus tendon during forward lunge exercise
That intact muscle is why tears get missed. Many people can still curl the toe in some way, so they assume nothing is seriously wrong. A tear can also happen slowly, with function fading unnoticed and pain spread more vaguely.11Foot and Ankle Surgery. Chronic rupture of flexor hallucis longus tendon in a world class runner It can pass for an ordinary sore foot or a lingering sprain, and the lost tip bending is noticed only when someone tests it deliberately. Over time the torn ends can scar into surrounding tissue, which is part of why old tears are harder to repair than fresh ones. If the toe tip never regained its curl after a foot or ankle injury, mention it specifically, because it is easy to overlook in an exam focused on the ankle.
The tendon can also get caught behind the ankle, causing back-of-ankle pain followed weeks later by trouble bending the toe.12PubMed Central. Posterior Ankle Arthroscopy for Flexor Hallucis Longus Entrapment: A Case Report The toe may lock bent and only release with a painful click.13PubMed Central. Posterior Ankle Arthroscopy for Flexor Hallucis Longus Entrapment: A Case Report It can be pinned after surgery to fix an ankle fracture too, leaving the toe tip curled and stuck.14PubMed. Hallux flexion deformity secondary to entrapment of the flexor hallucis longus tendon after fibular fracture
If the tendon thickens or a lump forms on it, it can catch as the toe moves. People often notice this when pushing off, climbing stairs or rising onto their toes. The catching comes and goes at first, so it may be dismissed until the toe begins to lock.
Dancers who rise onto their toes strain this tendon repeatedly, and runners and jumping athletes load it hard at push-off. People recovering from ankle fractures are at risk of scarring around it.
To confirm the problem, a doctor tests each joint of the toe separately. An ultrasound or MRI can show a tear or a thickened, stuck tendon, and also how far apart torn ends have pulled, which shapes the repair.
Stiff Joints, Turf Toe, and Scar Tissue
Hallux rigidus, or big-toe arthritis, wears the joint at the base of the toe.15PubMed Central. May footwear be a predisposing factor for the development of hallux rigidus? A review of recent findings It mainly blocks bending the toe up, while bending down often stays fairly normal.16PubMed Central. May footwear be a predisposing factor for the development of hallux rigidus? A review of recent findings So arthritis alone rarely explains a toe that can’t curl down, though pain may make you avoid the movement. It develops slowly over years, with stiffness and an aching joint.
Turf toe is a sprain of the tough pad under the base of the big toe, usually from forcing the toe up in sport. It typically begins with a specific moment, such as pushing off hard or having the toe bent upward under body weight, followed by pain, swelling and tenderness under the base of the toe. The pace of onset helps separate it from arthritis, though it is not a certain test. With a bad sprain, swelling and pain can make the toe hard to bend down and push off with, even though the tendons are intact. In severe cases, the pad and the small bones beneath the joint can tear apart.17PubMed Central. Plantar-plate disruptions: “the severe turf-toe injury.” three cases in contact athletes A toe that looks out of position, or a sudden loss of control, should be assessed with imaging rather than waited out.
After bunion surgery, scar tissue can cause lasting stiffness, trouble bending the toe, and pain with walking.18Hollowbrook Foot Specialists. Scar Tissue Formation After Bunion Surgery: What You Should Know Deeper scarring can feel like a tight band in the joint and pain when pushing off.19Foot & Ankle Centers. How to Break Up Scar Tissue After Bunion Surgery: What’s Normal and What Helps Some stiffness is expected for weeks after the operation, and steady improvement with exercise is a good sign. Stiffness that stops improving or worsens deserves a check with the surgeon.
Other conditions can look like a tendon problem. In people with gout, lumps of crystal deposits in the foot or ankle are linked to clearly weaker foot and ankle muscles,20PubMed Central. Clinically-evident tophi are associated with reduced muscle force in the foot and ankle in people with gout: a cross-sectional study so a history of gout flares in the foot or ankle is worth mentioning. Nerve damage, for instance from diabetes or a back problem, can weaken the toe muscles. Nerve weakness usually affects more than one movement and may come with numbness, tingling or burning, unlike a single torn tendon. In diabetes, reduced feeling in the foot means injuries can go unnoticed and the weakness can build gradually.
Treatment Without Surgery
For a stiff, painful big toe, a course of 12 physical therapy sessions combining joint mobilisation, toe-bending strengthening and walking practice improved motion, strength and pain.21PubMed. The effect of sesamoid mobilization, flexor hallucis strengthening, and gait training on reducing pain and restoring function in individuals with hallux limitus: a clinical trial In dancers, both stretching and slow lowering strength exercises improved the tendon’s range of motion.22PubMed. Immediate effects of ultrasound-guided percutaneous neuromodulation versus physical exercise on performance of the flexor hallucis longus muscle in professional dancers: a randomised clinical trial In one stubborn tendon case, a custom shoe insert removed pain within a week, allowing pain-free jogging.23PubMed Central. Recalcitrant Flexor Hallucis Longus Dysfunction: A Case Study Demonstrating the Successful Application of an Adaptable Rehabilitation Program With a Two-Year Follow-Up
Rehab usually runs in stages. Early on it focuses on calming pain and restoring gentle movement, with strengthening added slowly as the toe tolerates it. Walking practice comes last, retraining a smooth push-off.
At home, towel scrunches, pulling a towel toward you with your toes, work the curl. Marble pick-ups train the tip. Pressing the big toe down while lifting the small toes trains the short muscle. Stop any exercise that causes sharp pain.
Footwear helps as well. Avoid high heels, which change how the lower leg muscles load. A stiffer-soled shoe lets the toe rest at push-off, and rocker-bottom soles reduce how far the toe must bend.
Judge progress over weeks: does the toe bend further, feel stronger, or hurt less when walking? Mild pain that settles soon after exercise is generally acceptable, but pain that lingers into the next day suggests the load was too much. If nothing improves after a steady period of well-done rehab, go back for reassessment rather than repeating the same exercises. And a complete tear should not be expected to recover tip movement from exercise alone, since rehab cannot reconnect a tendon that has separated.
Steroid injections into the long tendon’s sheath are used rarely because they can weaken or rupture it.24Podiatry Today. Treating Flexor Hallucis Longus Tendon Dysfunction In Dancers If you have one, expect to be kept in a boot or brace for a time afterwards.25Podiatry Today. Treating Flexor Hallucis Longus Tendon Dysfunction In Dancers For stalled cases some clinics offer platelet-rich plasma injections or shockwave therapy, though evidence for these is limited.26NaplesPodiatrist. Flexor Hallucis Longus Tendinitis Treatment (2026 Guide)
When Surgery Is Needed and What Recovery Looks Like
Surgery is generally reserved for a complete tear with lost tip bending, or a tendon that is pinned and has not responded to non-surgical care. Many people with a partial problem are treated with rehab first and move to surgery only if function does not return. Age, general health and how long ago the injury happened also shape the decision, as does what you need from the foot: an athlete or dancer who needs full tip function may choose differently from someone who walks mainly for daily life.
A torn tendon can be freed from scar and rejoined, sometimes using a spare tendon from the outer lower leg as a bridge.27Foot & Ankle Surgery: Techniques, Reports & Cases. Surgical repair of a ruptured flexor hallucis longus tendon via tenoplasty and autogenous peroneus longus tendon graft A trapped tendon can be freed through small keyhole incisions at the back of the ankle,28PubMed Central. Posterior Ankle Arthroscopy for Flexor Hallucis Longus Entrapment: A Case Report which generally disturbs less tissue than open surgery. Afterwards the toe is typically protected in a boot or similar support so the tendon can heal before it is loaded, and rehab restores movement and strength in stages.
In one reported reconstruction of an old tear, push-off strength reached about 60% of the other foot by 8 weeks.29PubMed Central. Minimally invasive reconstruction of a large chronic complete flexor hallucis longus tendon rupture: a case report and literature review It reached about 80% by 3 months, when running and jumping were possible.30PubMed Central. Minimally invasive reconstruction of a large chronic complete flexor hallucis longus tendon rupture: a case report and literature review By 6 months it was about 90%, though the tip bent about 30 degrees versus 50 on the healthy side.31PubMed Central. Minimally invasive reconstruction of a large chronic complete flexor hallucis longus tendon rupture: a case report and literature review Even without surgery, one torn tendon regained only a small range of tip bending at a year, with about 70% strength.32PubMed Central. Closed atraumatic complete rupture of the flexor halluces longus tendon during forward lunge exercise Full tip bending may not return, but walking and sport usually can.
Useful questions for your surgeon: whether the tear is fresh or old, since that changes the repair; how long you will be in a boot and when weight-bearing starts; and when you can return to running or your sport.
Protecting Your Big Toe Afterward
Mild stiffness before exercise can linger for months after repair and usually eases within 10 to 15 minutes of warming up.33PubMed Central. Minimally invasive reconstruction of a large chronic complete flexor hallucis longus tendon rupture: a case report and literature review A short warm-up before sport is worth keeping as a habit. Keep doing toe-strengthening exercises a few times a week after you recover, and tie them to something you already do, such as after a shower or before a run, so they actually happen. Check your shoes occasionally too, since worn-out or very flexible soles can increase how much work the toe does at push-off.
Build back up gradually, increasing running or jumping volume a little at a time. Dancers should go easy on deep toe rises while healing. A return of ankle ache or clicking is an early warning.
Go back to the doctor for new sudden weakness of the tip, a toe that starts locking again, or pain that worsens despite rest and exercises.