Tibialis Posterior Tendon Transfer for Foot Drop

Treatment

What Works

Read the grades carefully. Only one row in this list has controlled evidence behind it, and it is about when to start moving rather than what to do.

Dark cinematic study of ankle and foot musculature

1. Correct timing of the operation itself Moderate

Refractory foot drop with no spontaneous recovery, presentation beyond 12 months from injury, or a nerve lesion that cannot be repaired or where repair has failed (PMID 35365268). Contemporary series operated at a mean of 5.6 years from injury.

This is the gate, not a therapy. Operating too early removes a working muscle from a foot that might have recovered by itself.

2. Early active movement from around day 5 Moderate

Instead of four weeks immobilised. Across all 66 transfers in the two datasets that tested it there were zero tendon pull-outs, and people reached independent walking at 44 days rather than 57 (PMID 20401554, PMID 19230819).

The limit, stated plainly: both datasets come from one research team in one disease, totalling about 45 patients. The surgeon still authorises this decision, but tradition is not the reason to make it.

3. Measure with a gauge, not by hand Moderate

Hand grading put 11 of 12 patients at grade 4 or 5 while their actual torque was about 30 percent of the other side (PMID 11409449), and a matched-control study measured 2 against 18 units of force (PMID 26160388).

4. Balance as a named target, not a by-product Moderate

Single-leg reach was measurably reduced against matched controls (PMID 26160388). The deficit is documented. The dose is not: no study has tested a balance programme in this population.

5. Motor re-education of the transferred muscle No evidence

No direct evidence in this population. Not "emerging". Across 77 retrieved records, the number of studies of biofeedback, motor relearning, gait training, electrical stimulation or strengthening is zero. The one mechanistic study measured brain activity in four patients with no control group and no functional outcome (PMID 17876404).

Exercise Prescription

There has never been a research study on which exercises work best after this operation. Every number below is a conventional, cautious starting point used in practice, not a figure taken from research. Your surgeon's instructions always come first, especially on when you may start moving the foot.

Exercise	How to do it	Sets × Reps	Frequency	Pain guide
Finding the new muscle	Sit with the leg supported. Try to lift the front of the foot, fingers resting on the top of the foot to feel the tendon tighten. It will feel strange and weak, which is expected	10 slow attempts, 3 second hold	4 to 5× daily	No pain. This is about finding it, not forcing it
Assisted foot lifts	Use your hand or a towel loop to help the foot up, hold it there briefly on your own, then lower slowly	2 × 10	Daily	Mild effort only
Active foot lifts	Lift the front of the foot unaided, lower slowly under control	3 × 10	Daily	Effort is fine. Stop for sharp pain at the scar
Standing balance	Hold a worktop. Stand on the operated leg up to 30 seconds, progressing to fingertip support	3 holds	Daily	Hold onto something every time. Balance is genuinely reduced after this operation
Walking practice	Heel first, rolling through to the toes, rather than lifting the whole leg high	5 to 10 minutes	Daily, building up	Stop if the foot starts catching from fatigue

What doesn't work

Chasing a normal strength number. No published group has produced one. Around a third of the other side is a good result, and time spent here is time not spent on gait and balance, which do improve.
Reporting a hand-graded muscle score as the outcome. It overstates this operation specifically, because it cannot tell a pulling muscle from a tight tether.
Warning the patient their arch will collapse. Four separate studies found essentially none: 0 of 10, 0 of 13, 3 of 381 feet, and 0 of 21.
Four to six weeks immobilised on tradition alone. The only controlled test found zero pull-outs from day 5 and about two weeks saved.
Promising restored toe lift after a double transfer. It was restored in only 8 of 14, and the double transfer did not improve ankle function.

Read this first

Red Flags

Most of what follows is about expectations and rehabilitation. This part is not. If any of these apply, act on them before you read anything else on this page.

Dark cinematic study of the lower leg and foot

Get seen urgently

The foot suddenly stops lifting as well as it had been, with or without a change felt at the top of the foot. This suggests the transferred tendon has pulled away from its anchor. It is rare, with zero cases across 66 transfers in the studies that looked for it, and rare is not never. Contact the operating surgeon urgently.
Wound breakdown, spreading redness, fever, or discharge from the inner ankle or the top of the foot. An infection over a tendon transfer puts the transfer itself at risk. Contact the surgical team the same day.
The foot goes cold, pale or dusky, or you get new numbness. That is a circulation problem, not a rehabilitation problem. Go to the emergency department.
Weakness spreading beyond the foot, into the other leg, or into the hands. This operation treats a fixed problem and does not explain a spreading one. Contact your doctor.
A new sore, blister or area of broken skin on the foot, especially under a brace or anywhere sensation is reduced. Get it seen within the week, sooner if it looks infected.
Pain that keeps getting worse rather than better, particularly burning pain or skin that becomes very sensitive to light touch. Contact your doctor.

Operating surgeon for anything mechanical or wound-related. Emergency department for circulation signs. Your doctor for a spreading deficit or worsening pain.

Progress

Return to Training

These criteria are clinical reasoning, not study-derived. No published return-to-activity criteria exist for this operation, and no study reports a return-to-sport or return-to-running rate. They are written to be measurable so a decision is at least consistent.

Surgeon has cleared progressive loading.
Wound fully healed, no discharge, no spreading redness.
Foot clears the ground through a 10 minute walk without catching or dragging.
Walking heel to toe rather than high-stepping, checked barefoot and in shoes.
No brace needed for walking on level ground.
Foot lifts to at least neutral, held against gravity for 10 repetitions.
Single-leg stance on the operated side for 30 seconds with fingertip support only.
Strength measured with a gauge and shared with you, with the expectation set that it stays well below the other side.
Two-legged squat and hinge at your previous working load with no next-day increase in foot symptoms.
You can state what the operation did and did not restore, in your own words.

Sit down, rest the foot flat, and press two fingers onto the top of your foot while you try to lift the front of it.

If you feel a cord tighten under your fingers, the transfer is loaded and doing its job, even if the foot barely moves. That cord is the muscle that used to sit deep in your calf.

Takes less than a minute. No equipment needed.

The Verdict

One-Line Summary

This surgery stops your foot dragging and gets you out of a brace. It will not make the foot strong.

Picture a bicycle brake cable rerouted to hold a door shut. Squeeze the lever and the door swings closed. But let go of the lever and the door still will not fall open, because the cable is now short enough to hold it there on its own. A surgeon moves a calf muscle to the top of your foot the same way. Some of the lift is the muscle pulling, and some of it is just the new tether being short enough to stop the foot dropping. Nobody has worked out how much is which, and that argument is still running in print.

Here is what is really happening: a muscle from deep inside your calf that used to point your foot down and turn it inward has been moved to the top of your foot, where it now has to pull the opposite way at the opposite moment in your stride.
What most people get wrong: judging this operation on a strength test, when measured with a gauge it produces roughly a third of the other side's power at best, and that is a normal good result rather than a failure.
The one change that matters: ask for the foot to be measured with a gauge rather than graded by hand, because hand grading consistently overstates what this operation delivers.

Best for

People whose foot drop has not recovered after a year or more, who want to stop tripping and get out of a brace, and whose tibialis posterior muscle still works properly.

Skip if

You are still inside the window where the nerve might recover on its own, the tibialis posterior itself is not working, or the drop is caused by bone deformity rather than nerve damage. Those need assessment first.

Want the full evidence? Keep scrolling

Trust anchor

Conviction

Moderate overall and deliberately split by endpoint, because the endpoints in this condition are not close to each other in evidence quality.

What is being claimed	Confidence
Improves foot position and converts high-stepping to a heel-to-toe gait	High
Gets people out of a brace	High
Improves patient-reported function	Moderate
Arch collapse afterwards is uncommon	Moderate
Early movement from day 5 is safe and faster	Moderate
Restores foot-lift strength	Low
The transfer works as an active muscle rather than a tether	Low
Any specific rehabilitation programme improves the result	No evidence

"No evidence" is a different claim from "low". Low means it was measured and came out weak. No evidence means nothing has been measured at all, and it is an absent field rather than a weak finding.

What would change the strength claim

A study using surface sensors on the transferred muscle, synchronised to instrumented walking, testing whether the foot still lifts during the swing phase when the transferred muscle is electrically silent. If it does, the transfer is largely a tether and strength training has a ceiling that no programme will raise. That single design would settle the argument that is currently running between a 2014 study and a commentary in the same journal issue.

What would change the rehabilitation claim

A two-arm randomised trial of at least 60 non-leprosy adults, randomised at six weeks after surgery to structured motor re-education against standard care, measuring foot-lift torque and function at 12 months. A meaningful difference would move the rehabilitation row from "no evidence" to "moderate", and would be the first evidence that anything a physical therapist does after this operation changes its result.

Next step

Foot drop is one of those problems where the honest answer and the confident answer are different answers.

Don't want to guess what the evidence actually says next time? Join The Verdict for free weekly protocols.

The Full Picture — Anatomy, Diagnosis & Evidence

What's Actually Going On

The tibialis posterior sits deep in the calf and runs behind the bump on the inside of your ankle. Its normal jobs are turning the foot inward and helping push it down, and it does that work while your foot is on the ground.

The transfer detaches it from its attachment, reroutes it to the top of the foot, and anchors it there. Now the same muscle has to pull the foot up, and to do it during the swing phase, when the foot is off the ground. It has to change both its direction of pull and its timing in your stride.

Dark cinematic anatomical study of the deep calf and ankle

Two routes exist. One passes the tendon through the membrane between the two shin bones, giving a straighter line of pull. The other passes it around the shin bone under the skin. The first is the more commonly reported technique across 42 groups of patients.

Here is the part that decides everything else. Foot position reliably improves: high-stepping converted to a normal heel-to-toe gait in 86.5 percent of 74 patients followed beyond 10 years, and in 380 of 381 feet in the largest series. But strength does not follow it. Hand grading recorded 4 or 5 out of 5 in 11 of 12 patients whose measured torque was about 30 percent of their other side. A matched-control study measured 2 units of force against 18 in people without the operation, and every one of those patients was satisfied, brace-free and would have the operation again.

A muscle graded 4 out of 5 that produces under a third of normal force is not a 4 out of 5 muscle. Hand testing cannot separate a muscle actively contracting from a tendon that is simply short enough to stop the foot falling, and that is exactly the distinction it is failing to make.

How to Identify It

The question here is rarely "what is this", because the operation is known. It is "why is this transfer underperforming", or more often "is this actually underperforming at all".

Dark cinematic study of the foot and ankle in examination

Hand-graded foot-lift strength Sn: not measured Sp: not measured
Known to overstate this group specifically. Use it to screen, not to conclude.
Gauge-measured foot-lift force Sn: not measured Sp: not measured
Compare against the other leg. Expect a large gap even in a good result.
How far the foot lifts, in degrees Sn: not measured Sp: not measured
One series recorded a middle value of 5 degrees, ranging from minus 15 to plus 10.
Single-leg balance reach Sn: not measured Sp: not measured
Reaching forward-and-out and backward-and-out were the directions that separated patients from controls.
Watching the walk for heel-to-toe versus high-stepping Sn: not measured Sp: not measured
The outcome that replicated in every single group of patients studied.
Arch height on standing Sn: not measured Sp: not measured
Compare sides, and expect no drop in the large majority.

"Not measured" here means never measured, not "we could not find it". No sensitivity, specificity or likelihood ratio has ever been published for any bedside test in this group of patients against any reference standard.

Dark cinematic study of lower limb structures

What else it could be, when a result disappoints. A sudden loss of lift that had already been gained points to the tendon pulling away from its anchor, and is the one urgent answer. Good passive movement with disproportionately poor active movement points to scarring restricting the tendon, or to a transfer that is mostly acting as a tether. Poor passive movement too points to a tight calf or a fixed bone deformity. Toes that will not lift while the ankle does is a separate problem that only a second transfer addresses. A deficit spreading beyond the foot is not a transfer problem at all. And the most common "failure" of the lot is a normal expected outcome being read as one, in a patient who is weak on testing and walking perfectly well without a brace.

The Debate

No clinical practice guideline exists for the rehabilitation of this operation as of August 2026. No NICE, APTA, BOA or equivalent guidance was found. So these conflicts come from inside the research literature itself, and they are unusually sharp.

Four weeks immobilised, against the only controlled test of it

The convention: immobilise the foot for four to six weeks, then a brace and physical therapy.

The evidence: active movement from day 5 produced zero tendon pull-outs across 66 transfers, and independent walking at 44 days against 57, a difference that was statistically solid.

Which to follow: the early-movement direction, where the surgeon's fixation allows and with the surgeon authorising it. The honest limit is that both datasets come from one team working in one disease.

Is it an active muscle, or just a tether?

One side: a 2014 study using three-dimensional gait analysis concluded the transfer works as an active substitution.

The other: an invited commentary in the same issue of the same journal asks in its title whether the correction comes from active lifting or a tethering effect. The original study concedes it cannot separate a tether from calf weakness for one of its own findings.

Why it matters: it decides whether retraining has a ceiling that no programme can raise. Unresolved, so plan for both. Train for strength, measure it, and do not promise it.

The same research group published two opposite verdicts

Paper one: 10 of 12 patients excellent or good, at an average of 90 months after surgery.

Paper two, same authors: 18 patients scored on a seven-part instrument covering brace need, shoe wear, activity level and foot posture. Average score 67 out of 100, classified as overall fair, with more than a quarter rated poor.

What changed: not the operation, and not the patients. The scoring system. A success rate for this procedure is a fact about the instrument as much as about the surgery, and both numbers deserve to be said out loud.

The arch collapse warning

The teaching: take away the tibialis posterior and the arch will fall.

The evidence: none in 10 patients at nearly four years, none in 13 at over five years where the operated foot was actually higher-arched, 3 of 381 feet with a meaningful drop, and none in a further 21 patients.

Which to follow: stop giving the warning. The proposed explanation is that the passive structures holding the arch, particularly the spring ligament, do more of the work than the old theory credited.

Honest Limitations

The evidence base is largely a leprosy literature

The single randomised trial, the movement-timing cohort, the 381-foot route series, the long-term follow-up and the brain-activity study are all in patients with Hansen's disease. That population has sensory loss, different tissue quality and a different rehabilitation setting.

What it means for you: the person a typical clinic actually sees, with a traumatic nerve injury, is represented by uncontrolled groups of 11 to 21 patients. Treat the timing evidence as a well-supported direction rather than a validated protocol.

The scores and the patients disagree, and the patients are more positive

In 7 of 18 patients, the person rated their own result better than the measuring instrument did. Every patient in the matched-control study was satisfied while every objective measure sat below the control group. People rated results good or excellent with foot-lift strength at 2 out of 5.

What it means for you: a clinician who counsels from the strength numbers alone will disappoint someone who is about to be delighted. Lead with what reliably happens, which is walking without a brace and a foot that sits straight.

Nothing a physical therapist does after this operation has ever been studied

Across 77 research records, the count of studies on biofeedback, motor relearning, gait training, electrical stimulation or strengthening in this population is zero. The only controlled rehabilitation question ever asked is when to start moving.

What it means for you: that is a gap in what researchers chose to study, not a low success rate, and the distinction matters because the first one is fixable. Every exercise prescribed after this operation, here or anywhere else, is convention rather than evidence, and you are entitled to be told which is which.

The Nuance

The comparison nobody has run is the obvious one. No study has followed a matched group of people who had the same refractory foot drop and simply kept wearing a brace. So this operation has never been tested against the thing it replaces. That is not a criticism of the surgery, it is a description of what is and is not known.

What is known sits on both sides of the ledger at once. People get out of the brace and stay out of it, gait converts from high-stepping to normal, foot position improves, patient-reported function rises substantially, and long-term follow-ups out to more than a decade show the gains hold. At the same time, measured strength stays low, push-off power is reduced, balance is reduced against people who never had the operation, and a structured multi-part score grades the whole procedure as fair.

Both are true. The operation is very good at one thing and mediocre at another, and the two keep getting reported as though they were the same result. The useful question before surgery is not "does it work", it is "which of these two things do I need".

One further piece of nuance on timing. Gains were still accruing between 6 and 12 months in the only study that measured at 1, 3, 6 and 12 months. Judging the final result at three months underestimates it.

Evidence

Sources

Stevoska S, Pisecky L, Stadler C, et al. (2023). Tendon transfer in foot drop: a systematic review. Archives of Orthopaedic and Trauma Surgery. PMID 34524486. Systematic review, 37 studies and 42 cohorts from 125 screened. Pooled analysis was not possible because outcome measures varied.
Rath S, Schreuders TA, Stam HJ, et al. (2010). Early active motion versus immobilization after tendon transfer for foot drop deformity: a randomized clinical trial. Clinical Orthopaedics and Related Research. PMID 20401554. The only randomised trial, N=24. Zero tendon pull-outs in both arms.
Rath S, Schreuders TA, Selles RW (2010). Early postoperative active mobilisation versus immobilisation following tibialis posterior tendon transfer. Journal of Plastic, Reconstructive & Aesthetic Surgery. PMID 19230819. N=21 against 21 historical controls. Independent walking at 44 against 57 days.
Johnson JE, Paxton ES, Lippe J, et al. (2015). Outcomes of the Bridle Procedure for the Treatment of Foot Drop. Foot & Ankle International. PMID 26160388. 19 patients and 10 matched controls, the only study with both a control group and instrumented strength testing.
Yeap JS, Birch R, Singh D (2001). Long-term results of tibialis posterior tendon transfer for drop-foot. International Orthopaedics. PMID 11409449. N=12 at an average of 90 months. Hand grade 4 or 5 in 11 of 12, measured torque about 30 percent of the other side.
Yeap JS, Singh D, Birch R (2001). A method for evaluating the results of tendon transfers for foot drop. Clinical Orthopaedics and Related Research. PMID 11210956. N=18. Average score 67.2, classified overall fair, with 27.7 percent poor.
Dreher T, Wolf SI, Heitzmann D, et al. (2014). Tibialis posterior tendon transfer corrects the foot drop component of cavovarus foot deformity in Charcot-Marie-Tooth disease. Journal of Bone and Joint Surgery (Am). PMID 24647501. Three-dimensional gait analysis, 14 patients, concluding active substitution.
Aronow MS (2014). Foot drop correction: by active dorsiflexion or tenodesis effect? Journal of Bone and Joint Surgery (Am). PMID 24647517. Invited commentary disputing the mechanism, in the same journal issue.
Wagner E, Wagner P, Zanolli D, et al. (2018). Biomechanical Evaluation of Circumtibial and Transmembranous Routes for Posterior Tibial Tendon Transfer for Dropfoot. Foot & Ankle International. PMID 29528722. Eight cadaveric specimens comparing the two routes.
Das P, Kumar J, Karthikeyan G, et al. (2013). Peroneal strength as an indicator in selecting route of tibialis posterior transfer. Leprosy Review. PMID 24428112. 381 feet over 11 years, with the route selected by residual muscle strength.
Pecheva M, Devany A, Nourallah B, et al. (2018). Long-term follow-up of patients undergoing tibialis posterior transfer: Is acquired pes planus a complication? Foot (Edinburgh). PMID 29454275. N=10 at nearly four years, with no arch collapse.
Sturbois-Nachef N, Allart E, Grauwin MY, et al. (2019). Tibialis posterior transfer for foot drop due to central causes: Long-term hindfoot alignment. Orthopaedics & Traumatology: Surgery & Research. PMID 30591416. N=13 at over five years, with no flatfoot.
Mathieu L, Achour S, Oberlin C, et al. (2022). Single versus double tendon transfer for foot drop due to post-traumatic common fibular nerve palsy. European Journal of Trauma and Emergency Surgery. PMID 33475777. N=27. Toe lift restored in only 8 of 14.
Solano-Pérez RJ, Fombona-Hernández Y, Aguilar-Menéndez CL, et al. (2026). Functional and quality of life outcomes after tibialis posterior transfer for foot drop from peroneal nerve injury. European Journal of Orthopaedic Surgery & Traumatology. PMID 42579056. N=19, measured at 1, 3, 6 and 12 months. Uncontrolled.
Hove LM, Nilsen PT (1998). Posterior tibial tendon transfer for drop-foot. 20 cases followed for 1-5 years. Acta Orthopaedica Scandinavica. PMID 9930107. All 17 patients walked without a brace.
Dwivedi N, Paulson AE, Dy CJ, et al. (2022). Surgical Treatment of Foot Drop: Pathophysiology and Tendon Transfers for Restoration of Motor Function. Orthopedic Clinics of North America. PMID 35365268. Sets the criteria for who is a candidate.

This surgery stops your foot dragging and gets you out of a brace.