Here is the full rewrite explaining the NHS pathway clearly:
Posterior Tibial Tendon Dysfunction (PTTD) / Adult Acquired Flatfoot Deformity:
A progressive condition where the posterior tibial tendon becomes inflamed, degenerates, and eventually fails. The tendon normally supports the medial arch and inverts the heel — when it stops working properly the arch gradually collapses, the heel rolls inward (valgus), and the forefoot abducts. Left untreated it leads to a fixed flatfoot deformity and osteoarthritis. There are four stages of severity.
Assessment:
- Palpation along the posterior tibial tendon — from behind the medial malleolus down to its navicular insertion. Tenderness and swelling along this course is a positive finding.
- Single Heel Rise Test — patient stands on one leg and attempts to rise up onto their toes. Inability or pain to do so indicates insufficient PTT. The heel should also invert as it rises; failure to invert confirms PTT weakness.
- Jack's Test — passively dorsiflex the hallux whilst the patient is standing. Failure of the medial arch to rise indicates the windlass mechanism is compromised, consistent with a collapsed arch and PTTD.
- Too Many Toes Sign — observe the patient from behind. If more than 1–2 toes are visible lateral to the heel, this indicates forefoot abduction and hindfoot valgus from arch collapse. A positive finding supports PTTD.
- Ask the patient when pain is worst — medial ankle and arch pain with standing and walking, worse after rest, is a key symptom. Morning stiffness is common.
- X-ray (weight-bearing) — to assess degree of arch collapse and rule out arthritis.
Management within the NHS — Stepped Care Pathway:
First line — what happens at your first NHS podiatry appointment:
The podiatrist will assess the patient, confirm the diagnosis, and begin conservative treatment straight away. This is what every patient gets at first:
- Holistic advice — footwear guidance (supportive, lace-up shoes with a firm heel counter; avoid flat unsupported shoes and ballet pumps), weight management advice if relevant, and activity modification to reduce tendon load.
- Exercise programme — the podiatrist will prescribe eccentric and progressive heel raise exercises (e.g. heel raises with heel turning inwards, single-leg lowering on a step). These are the most evidence-based intervention for PTTD and the patient is expected to do them daily at home.
- Paracetamol or NSAIDs for pain relief.
- Prefabricated insole with medial arch support and medial heel wedge — issued at the first appointment to offload the tendon and correct hindfoot valgus while the exercises take effect. This is the insole (see insole form below).
The patient is typically reviewed after 6–12 weeks. If they have improved, they continue with the exercises and insole long-term. If they have not improved, they move to second line.
Second line — if first line has failed after 6–12 weeks:
At this point the podiatrist escalates treatment because the simple insole and exercises alone have not been enough to control the deformity or pain:
- UCBL orthosis or Ankle Foot Orthosis (AFO) / Aircast brace — this is a more rigid device than a standard insole. The UCBL is a deep heel-cupping rigid shell that controls hindfoot valgus. An AFO or Aircast brace goes up around the ankle to provide more support and immobilise the tendon, allowing it to rest and recover. This is appropriate for Stage 2 PTTD where the tendon is partially torn or the deformity is progressing.
- The patient may also be referred to physiotherapy at this stage for more intensive rehabilitation and strengthening.
- Corticosteroid injection — may be considered for tenosynovitis (inflammation of the tendon sheath), but is used cautiously as injecting directly into the PTT carries a significant risk of tendon rupture. It is not routinely offered.
Third line — surgical referral:
If the patient has had 6 months or more of conservative management with no adequate improvement, or if the deformity has become fixed (Stage 3–4), the podiatrist refers to orthopaedic surgery. Patients with a fixed flatfoot are not suitable for NHS podiatry and go straight to surgical consideration. Surgical options include:
- Calcaneal osteotomy and lateral column lengthening to correct the deformity
- Tendon transfer to replace the failed PTT
- Double or triple arthrodesis for advanced fixed deformity with arthritis
Gait Analysis:
- Antalgic gait
- Reduced or absent heel inversion at toe-off
- Increased pronation throughout stance
- Forefoot abduction visible during walking (too many toes)
- Reduced push-off power
- Shortened stride length
Insole form:
Poron base — cushioning and shock absorbency
Medial heel wedge — corrects hindfoot valgus and reduces inward rolling of the heel, reducing stress on the PTT
Medial arch support — supports the collapsed medial longitudinal arch and reduces the load going through the failing tendon
Top cover — Vinyl for protection of the insole