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Subtalar & Triple Arthrodesis

When arthritis, severe deformity, or long-standing instability destroys the smooth motion between your hind-foot bones, each uneven step becomes a jolt. Arthrodesis (fusion) removes the painful joint surfaces, locks them in a plantigrade position, and lets bone grow solidly together—eliminating pain and halting further collapse.

  • Subtalar arthrodesis fuses the talus to the calcaneus.
  • Triple arthrodesis adds the talo-navicular and calcaneo-cuboid joints for three-way stability and powerful deformity correction.

Who Is a Candidate?

Imaging / Exam Finding Typical Conditions & Symptoms
End-stage subtalar or hind-foot arthritis (joint-space loss, sclerosis) Post-traumatic subtalar arthritis, calcaneal fracture sequelae, inflammatory arthritis
Rigid flatfoot or cavus deformity (Stage III–IV) Medial-arch collapse or high-arch varus with mid-foot ulcers
Severe posterior tibial tendon failure + hind-foot valgus Unable to walk > 10 min despite custom orthotics
Talocalcaneal coalition + recurrent pain after resection Teens & adults with rigid, painful hind-foot
Charcot neuro-osteoarthropathy with unstable hind-foot Rocker-bottom collapse threatening ulcer

Surgical Options & Key Details

Procedure Joints Fused Incision(s) & Fixation Ideal For…
Isolated Subtalar Fusion Talus ↔ Calcaneus 4–5 cm lateral incision; two 6.5 mm cannulated screws or posterior hind-foot nail Pure subtalar arthritis; mild deformity
Subtalar + Talonavicular Fusion (Double) Talus ↔ Calcaneus & Talus ↔ Navicular Lateral + small medial incision; screws/plate Painful subtalar arthritis plus mid-foot collapse
Triple Arthrodesis Talus ↔ Calcaneus, Talus ↔ Navicular, Calcaneus ↔ Cuboid “J-shaped” lateral incision (+ small medial if needed); low-profile plate + screws or hind-foot nail Rigid flatfoot, cavovarus, severe coalition, Charcot

Bone graft (autograft or allograft) fills any gaps after correction.

OR Snapshot (90 – 120 min)

  • Regional popliteal + ankle block (+ light IV sedation).
  • Remove residual cartilage → decorticate bone to bleeding surface.
  • Correct deformity – calcaneus shifted under tibia; fore-foot pronation/supination balanced.
  • Pack graft; insert screws/plate/nail under fluoroscopy.
  • Waterproof dressing, posterior splint in neutral alignment.

Expected Course & Milestones

Phase Weight-Bearing Rehab Focus
0 – 6 wk Non-weight-bearing (cast or splint) Elevation, edema control, core/hip conditioning
6 – 10 wk Partial WB in CAM boot after X-ray shows early union Gentle ankle ROM, isometric calf
10 – 14 wk Progress to full WB boot → stiff sneaker Gait training, intrinsic-foot strength
4 mo + Custom orthotic & rocker-sole shoe Low-impact sport; hiking/golf at 6 mo once CT confirms solid fusion

Full union averages 10–12 weeks (subtalar) and 12–16 weeks (triple).

Outcomes & Evidence

Metric (systematic reviews 2023) Subtalar Triple
Fusion success > 95 % > 90 %
Pain relief (VAS) ↓ 70 – 90 % ↓ 75 – 95 %
Return to low-impact work 10 wk 12 wk
Hardware removal need < 5 % 5 – 10 %
Adjacent-joint arthritis at 10 yr 18 % 10 % (because joints were already fused)

Benefits & Risks

Benefits Risks (mitigation)
Eliminates grinding pain Non-union 3 – 7 % (smoking cessation, graft + compression screws)
Corrects deformity, improves gait Wound healing issues (< 5 %) – meticulous soft-tissue handling
Stable platform for orthotics & footwear Hind-foot stiffness (expected) – rocker-sole shoes restore roll-over
Prevents ulcer / impingement progression DVT prophylaxis with aspirin/LMWH during NWB

Our Surgical Philosophy

  • Fuse only the joints that hurt – isolated subtalar when deformity mild; triple when multi-plane correction needed.
  • Precise alignment – intra-op fluoroscopy + mechanical axis rods ensure heel under tibia and fore-foot plantigrade.
  • Early non-impact motion – hip/knee/core exercise keeps conditioning; ankle ROM started once hardware stable.
  • Long-term off-load – rocker-sole or carbon-plate shoes minimise stress on adjacent joints.

Frequently Asked Questions

Most patients notice little difference on flat ground; modern rocker shoes restore smooth roll-through. Hiking on uneven terrain feels more stable, not less.

Titanium screws/plates stay unless they irritate (rare). Hind-foot nails stay unless infection or non-union requires revision.

Some risk exists over decades; proper alignment and cushioned footwear keep it low. Triple fusion actually removes the joints most prone to deterioration.

Ready for Pain-Free, Stable Steps?

If every uneven surface sends pain through your hind-foot, a subtalar or triple arthrodesis can deliver lasting relief and dependable alignment. Schedule an imaging review with North Texas Podiatry Associates to map your safest, most effective fusion plan.

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