Back Pain Doctor
Posterior Tibial Tendon Dysfunction (Adult Acquired Flatfoot)
Written by Dr Joshua Hatch, Musculoskeletal GP, RACGP Fellow, Diploma in Musculoskeletal Medicine (FSEM UK).
Posterior tibial tendon dysfunction (PTTD) (also called progressive collapsing foot deformity or adult acquired flatfoot) occurs when the posterior tibial tendon, the main support of the arch, becomes inflamed, weakened or torn. The arch gradually flattens, and without support the deformity can progress and involve the ankle. It is more common in women, in people over 40, and with obesity, diabetes or hypertension.
Assessment is largely clinical, supported by weight-bearing X-rays and, where the tendon needs evaluating, ultrasound or MRI. An important early sign is difficulty rising onto the toes on one leg, and whether the foot is still flexible guides treatment.
Management is initially non-surgical and focuses on supporting the arch and offloading the tendon (orthoses, bracing, supportive footwear, calf stretching, activity modification and weight management) usually coordinated with podiatry and physiotherapy. A cortisone injection into the tendon is avoided because of rupture risk. Referral to a foot and ankle surgeon is appropriate when the deformity is progressing or pain is not settling, as reconstruction is complex and recovery prolonged.
Common symptoms
- Pain and swelling along the inside of the foot and ankle
- A flattening arch, often with the foot pointing outward
- Weakness or pain when pushing off or standing on the toes
- Later, pain on the outside of the ankle as the heel shifts
Commonly seen in
Evidence for twelve treatment options in posterior tibial tendon dysfunction (adult acquired flatfoot)
This is not a fixed ladder or a package of treatments. Every option is assessed independently against this diagnosis, including treatments with limited direct research that may still be reasonable for a clearly defined tissue target. The evidence level, likely benefit, risks, cost and alternatives are weighed at consultation.
Foundation: diagnosis, education and rehabilitation
The part of care with the broadest relevance. For many people it is enough on its own; other options are judged against it, not automatically added after it.
Diagnosis, education and progressive rehabilitation Working out what is driving the pain, explaining what your imaging does and does not mean, and building a graded loading plan you can actually follow. Core care
What it involves
Assessment to identify the likely pain source, an explanation of what the diagnosis means, adjustment of the loads that aggravate it, and a progressive strength and conditioning plan, with weight management where that is clinically relevant.
What the evidence shows
Loading is the treatment, and the trials say adjuncts add little to it. A living network meta-analysis of 68 randomised trials across Achilles and patellar tendinopathy and gluteal tendinopathy found no convincing evidence that any adjunct, alone or added to exercise, beats exercise by itself, and recommended exercise alone for at least three months before an adjunct is considered (Challoumas, Sports Med Open 2023). A meta-analysis of 110 studies and 3,953 patients found greater effect where the programme added external load rather than body weight alone, and where sessions were less frequent than daily, allowing recovery (Pavlova, Br J Sports Med 2023). A 204-study synthesis found exercise safe, beneficial and acceptable to patients, with no clear superiority for the eccentric-only protocols long treated as standard (Cooper, Health Technol Assess 2023).
Pairing reviewed 2026-09-02.
Where it fits
This is the plan, not the preliminary. Expect a programme measured in months rather than weeks, with load progressed against your symptoms. Anything else offered here is an adjunct to it, and the evidence for adding one before three months of proper loading is weak.
Muscle and symptom-modifying options
Useful only when the examination identifies the tissue they target or when short-term pain control creates a useful rehabilitation window.
Wet needling and trigger point injection (trigger point injection) A fine needle into a tender band of muscle, with a small volume of dilute glucose solution injected through it. No study in this condition
What it involves
The needle is placed into the tender muscle band and a small volume of 5% glucose with a very dilute local anaesthetic (0.02-0.08%) is injected. Often done in the same visit as your assessment, and usable where the tender area sits deeper. Dry needling (the same technique with nothing injected) is not offered here.
What the evidence shows
Searched 7 November 2026 (PubMed: trigger point, dry needling, wet needling, trigger point injection, myofascial or intramuscular stimulation with tibialis posterior or posterior tibial, 14 records, three of them stroke-spasticity studies and two cadaver studies; and a randomised-trial and systematic-review pass). No study has injected or needled a trigger point in people with tibialis posterior tendon dysfunction. The nearest work is in other groups: an 82-person sham-controlled trial of a single dry needling session to tibialis posterior trigger points in people without a stated tendon diagnosis measured only foot pressure, which changed for 24 hours and not at 72 hours (Martínez-González, PLoS One 2026); a cadaver study and a healthy-volunteer ultrasound study of needle safety near the tibial nerve and artery (Albin, Int J Sports Phys Ther 2021); and a retrospective study of needle-knife release of tibialis posterior in painful accessory navicular, a different procedure (Cheng, Quant Imaging Med Surg 2026).
Pairing reviewed 2026-11-07.
Where it fits
Bracing or an orthosis and a tibialis posterior loading program treat the tendon. A trigger point injection would be considered only where a tender calf-muscle band is found adding to the pain.
Ultrasound-guided injections Guidance means the needle can be seen reaching the target. What goes into the needle depends on the diagnosis. Uncontrolled series only
What it involves
The injection is performed under ultrasound so the needle can be watched into the target structure. What is injected is decided by the diagnosis, and corticosteroid is used sparingly, for the reasons set out below.
What the evidence shows
Searched 3 November 2026 (PubMed: tibialis posterior or posterior tibial with tendinopathy, tenosynovitis, dysfunction or tendinitis and corticosteroid, steroid, triamcinolone or injection, 26 records; and a randomised-trial and systematic-review pass, which found no trial in this condition). No randomised trial of a steroid injection in this condition was found; the evidence is uncontrolled. In 33 patients given 38 ultrasound-guided corticosteroid injections into the tendon sheath, 47% of injections gave good or better pain relief, 21% of patients went on to surgery, and no complications were recorded; the review was retrospective and had no comparison group (Spencer, Australas J Ultrasound Med 2023). In 65 people given local anaesthetic and steroid into the sheath under X-ray, 48% had complete or near-complete relief at six months or more, 26% had relief that wore off and 26% had none; across all 144 tendon-sheath procedures in that series, one posterior tibial tendon ruptured (Jaffee, AJR Am J Roentgenol 2001). In 166 patients, an earlier cortisone injection was one of the factors that distinguished those who later had surgery (O'Connor, Foot Ankle Int 2010); that study does not show the injection caused it. Rupture after repeated steroid injection is a recognised concern for this tendon (Simpson, J Foot Surg 1983). Local anaesthetic into the sheath is also used to confirm the diagnosis, and gave complete relief in all 17 ankles with early disease in one series (Cooper, Foot Ankle Int 2007).
Pairing reviewed 2026-11-03.
Where it fits
Bracing or an orthosis and a progressive loading program are the main treatment. Where tendon-sheath pain is blocking that program, a guided injection into the sheath may be discussed, with the variable benefit and the small risk of rupture explained, and the loading program continuing. See the note on cortisone.
V-ACTOR vibration therapy (vibration therapy) Low-frequency vibration applied over tender muscle. Not a shockwave, despite sharing the machine. Plausible: no studies
What it involves
A vibration handpiece is moved over the tender muscle and fascia for a few minutes. It runs from the same STORZ MASTERPULS icon console as radial shockwave but is a separate handpiece delivering a different, gentler form of energy. No needles, no anaesthetic, no downtime.
What the evidence shows
No published clinical trial of this device in this condition. It is a vibration handpiece delivered from the same console as radial shockwave, and the rationale is myofascial rather than tendon- or bone-directed.
Pairing reviewed 2026-08-30.
Where it fits
A comfort measure used within a session where muscular tightness is limiting movement. Never the reason for the appointment, and not a substitute for the treatments that do have evidence.
Energy-based treatment options
Radial pressure wave, focused shockwave and EMTT have different targets and different evidence. They are assessed separately rather than treated as one category.
Radial or focused shockwave? Read the overviewRadial shockwave (radial pressure wave) Broad treatment across tender muscle and fascia, close to the surface. One 10-person case series
What it involves
A handpiece is moved over the tender tissue while ballistic pressure pulses are delivered, using a transmitter head chosen for the tissue, including heads shaped for fascia and for the muscle either side of the spine. The pulse is strongest at the skin and weakens with depth, so this is mainly a myofascial treatment, though it can reach deeper in some areas. No anaesthetic, no downtime, usually a course of sessions about a week apart.
What the evidence shows
Searched 20 October 2026: shockwave, shock wave, ESWT, rESWT or radial shock with tibialis posterior, posterior tibial, flatfoot, accessory navicular or navicular (25 records), and with progressive collapsing foot, PTTD, os tibiale, pes planus, planovalgus or acquired flatfoot (4), with randomised-trial and systematic-review passes that found nothing in this condition; racehorse navicular studies were set aside. No randomised trial exists. In a case series of 10 people with tibialis posterior tendinopathy who had not improved with standard care, radial shockwave combined with a progressive foot-strengthening program gave a clinically important improvement in daily-activity function in 9 and in sport function in 8 at a median of four months, with no side effects; there was no comparison group (Robinson, J Foot Ankle Surg 2020). Two single case reports at the tendon's attachment to the navicular, device not stated, describe lasting relief and, in a teenager with a calcified tendon, the calcium clearing by six months (Andresen, J Surg Case Rep 2024; Ikoma, Prog Rehabil Med 2018). A retrospective study added shockwave after flatfoot surgery, aimed at the calf rather than this tendon (Zeng, Indian J Orthop 2026).
Pairing reviewed 2026-10-20.
Where it fits
Can be discussed alongside a foot and calf strengthening program and, where needed, footwear or orthotic support, for tendon pain on the inside of the ankle that has not settled. The evidence is one small series without a comparison group. A tendon that is failing, with the arch progressively collapsing, needs a surgical opinion rather than more shockwave.
Focused shockwave (ESWT) A true shock wave converging at depth: for tendon, joint, ligament and bone. No focused-device study
What it involves
A focused system generates an acoustic shock wave that converges at a focal point set at a defined depth, concentrating the energy where the target is. This is the form used for tendon, joint, ligament and bone. Typically four to six sessions about a week apart, no anaesthetic and no formal downtime.
What the evidence shows
Searched 20 October 2026 (the searches named in the radial row: 25 and 4 records, with randomised-trial and systematic-review passes that found nothing in this condition). No study used a focused device at the tibialis posterior tendon. The one case series used radial shockwave (Robinson, J Foot Ankle Surg 2020); two case reports at the navicular attachment do not name the device (Andresen, J Surg Case Rep 2024; Ikoma, Prog Rehabil Med 2018), and a retrospective flatfoot-surgery study aimed shockwave at the calf, device not stated (Zeng, Indian J Orthop 2026).
Pairing reviewed 2026-10-20.
Where it fits
Plausible on the same mechanism as other tendon problems and can be discussed on that basis alongside the strengthening program, but patients are told the only series in this condition used the radial device.
EMTT (magnetotransduction therapy) High-energy magnetic pulses applied over the area. Usually painless, no contact. Plausible: no studies
What it involves
You sit with the applicator positioned over the area for a short session. It is usually painless and needs no gel or skin contact. It is usually given as a course, commonly alongside shockwave.
What the evidence shows
There are no published randomised trials of EMTT in this condition, or in any musculoskeletal condition, that could be identified. The supporting work is laboratory work: EMTT increased tenocyte proliferation, migration and collagen expression in cultured human tendon cells (Mancini, Int J Mol Sci 2025). The nearest human evidence for a related electromagnetic therapy is negative. A randomised trial of pulsed electromagnetic field therapy added to eccentric exercise for Achilles tendinopathy found no improvement in outcome scores or tendon neovascularity over eccentric exercise alone (Ko, Orthop J Sports Med 2024).
Pairing reviewed 2026-08-30.
Where it fits
Offered only as an adjunct alongside treatment that does have evidence, never as the plan itself, and only after that gap is explained. Much of the EMTT literature is manufacturer-affiliated, which is part of why it is described this way.
Biologic and joint injection options
Each injection is assessed independently for the named diagnosis. Cost, uncertainty, likely benefit, risks and alternatives are part of the decision.
Platelet-rich plasma (PRP) Your own blood, concentrated and injected under ultrasound guidance. Only a few unseparated cases
What it involves
Blood is taken from your arm, spun to concentrate the platelets, and injected into the target under ultrasound guidance in the same appointment.
What the evidence shows
Searched for PRP at the posterior tibial tendon and in adult acquired flatfoot. Fourteen records, and no trial or controlled study of an injection for this tendon. The only report of PRP injected on its own is five posterior tibial tendons within a series of 19 elite dancers treated at different sites under ultrasound guidance. Eighteen of the 19 returned to dance, most within six months, but the tendon cases were not reported separately and the foot and ankle sites were the slowest to recover (Jain, J Dance Med Sci 2018). Otherwise PRP has only been used as an addition to surgery: 13 people with an early flatfoot had a supporting screw placed, the tendon inspected through a small scope and PRP delivered at the same operation, and their pain and function scores improved at about two and a half years, with no way of telling what the PRP contributed (Yasui, Int Orthop 2017).
Pairing reviewed 2026-10-10.
Where it fits
Not something to choose ahead of the established treatment, which is an orthotic or brace to support the arch and a progressive strengthening program for the tendon. PRP can be discussed only on the understanding that no study has tested it for this tendon on its own.
Prolotherapy (dextrose) A course of dextrose injections into and around the structure and its attachments. Plausible: no studies
What it involves
Hypertonic dextrose is injected at the tender ligament and tendon attachments, and into the joint where relevant, usually as a series of treatments a few weeks apart.
What the evidence shows
No study of dextrose prolotherapy in posterior tibial tendon dysfunction was found. A PubMed search on 13 October 2026 (prolotherapy, dextrose, hypertonic glucose or hyperosmolar with posterior tibial, tibialis posterior, adult acquired flatfoot or flatfoot) returned two records, and passes restricted to randomised trials and to systematic reviews or meta-analyses found nothing in this condition. The one clinical record is a single case treated after ankle surgery with ultrasound-guided injections of polydeoxyribonucleotide, a different injectate that its authors called prolotherapy (Lim, Medicine 2016); it says nothing about dextrose. The other record is an anatomy paper on the nerves of the inner ankle.
Pairing reviewed 2026-10-13.
Where it fits
Can be discussed for a painful but intact tendon where pain persists despite orthoses or bracing and a loading program, with the absence of studies stated. It cannot rebuild a collapsed arch or repair a torn tendon.
Viscosupplementation (hyaluronic acid) A gel-like injection into an arthritic joint. Widely used, and genuinely contested. Not used for tendons
What it involves
One or a short series of hyaluronic acid injections into the joint under ultrasound guidance.
What the evidence shows
Not offered here, and not studied. PubMed searches pairing hyaluronic acid, hyaluronate or hylan with posterior tibial or tibialis posterior tendon terms returned no treatment study of any kind, and a meta-analysis of 19 randomised trials of hyaluronic acid in soft-tissue problems contains none at this tendon (Khan, Sports Health 2022). This is an absence of evidence, not evidence that it fails.
Pairing reviewed 2026-11-09.
Where it fits
Not offered for this problem. Hyaluronic acid is considered only for a problem inside a joint, and this is a tendon problem. Tendon loading, footwear and orthotic support remain the centre of treatment.
Nerve-targeted options
Relevant when examination identifies a superficial neuropathic pattern or a compressed peripheral nerve, not simply because pain is present.
Lyftogt perineural therapy (perineural injection therapy) A series of small dilute dextrose injections just under the skin, over tender superficial nerves. Only if relevant
What it involves
Small injections of low-concentration dextrose, usually 5%, placed just beneath the skin along tender superficial nerves. Given as a series of short sessions.
What the evidence shows
No study has tested dextrose injections of any kind for posterior tibial tendon dysfunction. Searching the perineural injection, neural prolotherapy, subcutaneous dextrose, glucopuncture and neurofascial terms against the posterior tibial tendon and flatfoot returns no treatment study, and a randomised-trial search on 6 October 2026 returned no record. Widening to any dextrose or prolotherapy injection adds one case report, and it used a different injectate altogether: ultrasound-guided polydeoxyribonucleotide in a 67-year-old whose tendon failed three years after ankle surgery, with less pain and a better arch described but no measurements and no comparison (Lim, Medicine 2016). Injections around the nerves of the foot and ankle have been reported for nerve pain in this region. Across 59 ultrasound-guided procedures in 46 people, the saphenous and posterior tibial nerves among them, 43 of 45 gave immediate relief and 23 of the 38 with follow-up gave relief that lasted beyond the injection (Walter, Skeletal Radiol 2017). Those were placed around the nerve under ultrasound for a nerve problem, not under the skin for a tendon problem.
Pairing reviewed 2026-10-06.
Where it fits
Not a treatment for the tendon, which is managed with the options higher up this page. Considered only where tender, hypersensitive skin or nerve-type pain over the inner ankle sits alongside the tendon problem.
Ultrasound-guided nerve hydrodissection Fluid placed around a nerve to free it from the surrounding tissue. Plausible: no studies
What it involves
Under ultrasound, fluid is placed in the plane around the nerve to separate it from the tissue that is tethering or compressing it.
What the evidence shows
No clinical study of hydrodissection in posterior tibial tendon dysfunction. What exists is mechanism at exactly this tendon: in twelve cadaver legs, hydrorelease between the epimysial fasciae of tibialis posterior and flexor digitorum longus lowered the gliding resistance measured during tendon pull by 4.3% (Shiwaku, BMC Musculoskelet Disord 2025). That shows the injection does what it is said to do to gliding. It says nothing about whether people with a failing tendon feel better.
Pairing reviewed 2026-09-08.
Where it fits
Not a treatment for the tendon. Relevant only where assessment finds a nerve involved as well, most often a tarsal tunnel pattern at this part of the ankle.
This is general information only and suitability is assessed individually. Treatments with limited or condition-dependent evidence may still be discussed, but only with clear explanation of the uncertainty, the expected benefit, risks, cost and alternatives. Red flags, progressive neurological symptoms or suspected serious pathology require a different pathway.
Every treatment above is described in full on the non-surgical treatments page, including what each one is used for and what the evidence supports. Ratings apply to the named diagnosis; an adjacent muscle, tendon, joint or nerve problem is assessed as a separate target. The method behind the ratings, and the treatments not offered, are set out on the evidence page.
Corticosteroid injection is reviewed separately for each diagnosis.
Cortisone reliably reduces pain in the short term, and that can be genuinely useful when pain is stopping you sleeping or moving enough to rehabilitate. Beyond that window the picture changes. A systematic review of 41 randomised trials and 2,672 participants found that corticosteroid injection reduced pain in the short term but that the effect reversed at intermediate and long term; in pooled analysis for lateral epicondylalgia the short-term effect was large (SMD 1.44, 95% CI 1.17 to 1.71) while no intervention was favoured at 26 weeks (-0.40, -0.67 to -0.14) and at 52 weeks (-0.31, -0.61 to -0.01) (Coombes, Lancet 2010). In a randomised trial in lateral epicondylalgia, 83 per cent of the corticosteroid group had completely recovered or much improved at one year against 96 per cent given a placebo injection, and recurrence ran at 54 per cent against 12 per cent; adding physiotherapy made no significant difference at one year (Coombes, JAMA 2013). In joints, repeated corticosteroid injections have been associated with cartilage loss. It does not repair anything.
So treatment plans are not built around it. Where an injection is the right call, the specific diagnosis and target are reviewed, what is being injected and why is discussed, the number is kept low, and it is paired with the loading work that changes the longer-term course.
When it might still be considered
- Pain severe enough to block rehabilitation
- A clear inflammatory or bursal target on imaging
- A specific short-term goal: a trip, a procedure, a return to work
- Diagnostic use, where the response shows where the pain is coming from
When a cortisone injection is worth doing, and when it is not
Other foot, ankle & lower leg conditions
Pain in the same area can come from more than one source, and the label matters less than what the examination and history point to. These are the other guides for this region.
Frequently asked questions
How is it diagnosed?
Can it be treated without surgery?
Why is early treatment important?
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