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First MTP Joint Fusion & Replacement

When the big-toe (first metatarsophalangeal, MTP) joint becomes so arthritic that every push-off feels like grinding glass, two definitive surgical solutions remain:

  • First-MTP Fusion (Arthrodesis) — locks the joint in a pain-free, functional position.
  • First-MTP Joint Replacement (Arthroplasty) — removes the diseased surfaces and implants a motion-preserving prosthesis or polymer spacer.

Both restore pain-free gait, but the right choice depends on activity level, bone quality, angular deformity, and footwear goals. Below is a side-by-side guide in the same style as your approved treatment pages.

Candidacy at a Glance

Question Fusion Best Replacement Best
Severe bone-on-bone arthritis (Grade 3–4)? ✓ ✓
Significant deformity (hallux valgus > 20°, intermetatarsal > 15°)? ✓ ✗
High-impact athlete / manual laborer? ✓ (durability) ✗
Desires shoe flexibility for high heels or yoga poses? ✗ ✓
Osteoporosis / bone fragility? ✗ (non-union risk) ✓ (silastic or poly spacer)
Prior failed cheilectomy or Cartiva®? ✓ (salvage) ✓ (if alignment good)

Surgical Options & Technique Highlights

Step Fusion (Gold-Standard) Replacement (Motion-Preserving)
Approach 4 cm dorsal incision Same dorsal approach
Cartilage removal Both joint surfaces denuded Diseased surfaces resected to accept implant
Alignment Toe set at 10-15° dorsiflexion, 5-10° valgus Implant resurfaces joint; toe alignment maintained
Fixation / Implant Low-profile dorsal plate + lag screw or crossed screws • Metal-on-poly hemi/total • Cartiva® hydrogel spacer
Weight-bearing NWB boot 2 wk → WB boot 2 wk → stiff shoe wk 4 WB sandal day 1 (Cartiva®); implant systems NWB 1 wk
OR time 45–60 min 40–50 min

Outcomes & Evidence

Metric Fusion Replacement
Union / Implant survival 95–98 % union ≤ 10 wk 85–90 % survivorship 10 yr (modern metal-poly)
Pain relief (VAS) ↓ 75–90 % ↓ 70–85 %
Dorsiflexion at push-off 0° (rigid) ~ 40–50° (near normal)
Return to low-impact sport 10–12 wk 8–10 wk
Complications Non-union 2–5 %; hardware irritation < 5 % Implant loosening 5–10 %; subsidence with osteoporosis

RCTs and registry analyses confirm fusion remains the durability leader, while modern replacements provide excellent pain relief and functional ROM for low-impact lifestyles.

Benefits & Risks

Benefit Fusion Replacement
Reliable long-term pain elimination ✅ strongest ✅ strong
Preserves joint motion ❌ ✅
Allows high-impact / work boots ✅ ⚠ (implant wear)
Shoe heel height flexibility (> 1″) ⚠ limited ✅
Risk of future revision Low Moderate — conversion to fusion possible

Post-Op Milestones

Time Point Fusion Replacement
Day 1 Elevation, ankle pumps WB in sandal (Cartiva) or light WB in boot
Week 2 Suture removal; X-ray union check Suture removal; ROM exercises start
Week 4 Transition to stiff-soled sneaker Normal sneaker if wound dry
Week 8–10 Union confirmation; begin jog/bike Low-impact sport resume
Month 3–4 Running, hiking, golf Impact drills if implant secure

Our Surgical Philosophy

  • Precision selection We choose the least-restrictive option that still guarantees pain relief and longevity.
  • Image-guided alignment Intra-op fluoroscopy sets fusion angle for painless push-off and shoe versatility.
  • Early ROM, early load for replacements; stable fixation, bone health optimisation for fusions.
  • Conversion plan Every replacement chosen such that easy salvage fusion remains viable if ever needed.

Frequently Asked Questions

No—gait studies show negligible difference; the great toe’s motion is primarily during push-off, and fusion angle preserves roll-through.

Titanium/CoCr components rarely trigger alarms, but we provide an implant card.

Hydrogel spacers can subside over years; if pain recurs, conversion to fusion is straightforward.

Ready to Walk Pain-Free Again?

Whether you need rock-solid fusion durability or motion-preserving replacement freedom, North Texas Podiatry Associates delivers evidence-based first MTP joint solutions tailored to your lifestyle.

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