First Metatarsophalangeal Joint Fusion: Hallux Arthrodesis for Severe Bunion and Arthritis

What Is First MTP Joint Fusion?

First metatarsophalangeal joint fusion — also called hallux arthrodesis — is a surgical procedure that permanently fuses the big toe to the first metatarsal bone, eliminating motion at the joint while positioning the hallux in a functional, pain-free alignment. The procedure is indicated for conditions that have caused irreversible joint destruction: severe hallux valgus with concurrent arthritis, end-stage hallux rigidus (Stage IV), rheumatoid arthritis involving the first MTP joint, revision of failed previous first MTP procedures, and certain neuromuscular conditions affecting hallux stability.

Why Fusion Is Chosen Over Joint Replacement

Unlike other large joints such as the hip and knee where arthroplasty has replaced fusion as the preferred treatment, the first MTP joint presents unique challenges for replacement implants. The high load concentration, multi-directional stresses during push-off, and limited soft tissue envelope make implant survival rates for first MTP replacement substantially lower than for hip and knee arthroplasty. First MTP arthrodesis, by contrast, has fusion rates exceeding 95 percent, provides durable pain relief, and allows return to a full range of activities including sports and physically demanding work. Patient satisfaction with fusion — once patients understand that some motion is sacrificed — is consistently high in published outcome studies.

Surgical Technique

A dorsal or dorsomedial incision exposes the first MTP joint. Articular cartilage is removed from both the metatarsal head and the base of the proximal phalanx, and the bony surfaces are prepared to maximize contact area for fusion. The hallux is positioned in slight dorsiflexion (10 to 15 degrees) and abduction to approximate normal push-off mechanics, then secured with a combination of a dorsal locking plate and a lag screw — the gold standard construct for first MTP arthrodesis. Bone graft may be added to enhance fusion in revision cases or where there is bone deficit. The position achieved at surgery determines the functional outcome: too much dorsiflexion causes sesamoid pain, too little causes limited shoe wear tolerance.

During the non-weight-bearing recovery phase, a BraceAbility walking boot protects the surgical site and provides the immobilization needed for proper bone healing after fusion.

Recovery

Patients are typically non-weight-bearing or heel-weight-bearing in a surgical shoe for the first 4 to 6 weeks while initial bony consolidation occurs. Transition to regular footwear with a stiff sole begins at 6 to 8 weeks after radiographic evidence of bridging fusion. Return to athletic shoes, comfortable work footwear, and low-impact activity occurs by 3 months for most patients. Running and high-impact sports are typically cleared at 4 to 6 months. Women concerned about shoe choices should know that flat, wide-toed shoes, most athletic shoes, and many dress shoes are compatible with the fused position — high heels are not.

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Frequently Asked Questions About First MTP Fusion

Can you walk normally after big toe fusion?

Yes, most patients walk normally after first MTP fusion. While you lose up-and-down motion at the big toe joint, the fusion is set at a functional angle that allows a natural gait. In our practice, patients report that the elimination of pain far outweighs the loss of joint motion. Shoes with a slight rocker bottom or stiff sole work best long-term.

How long is recovery after first MTP fusion?

Recovery from first MTP fusion typically follows this timeline: 2 weeks in a surgical boot non-weight-bearing, followed by 4-6 weeks of protected weight-bearing in a walking boot. Most patients transition to supportive shoes by 8-10 weeks and return to full activity by 3-4 months. Complete bone healing takes approximately 8-12 weeks.

Is first MTP fusion better than joint replacement?

For most patients with severe hallux rigidus, fusion is more predictable and durable than joint replacement. A 2024 study in the Journal of Bone and Joint Surgery found that MTP fusion had a 95% satisfaction rate at 10 years compared to 78% for implant arthroplasty. Joint replacement may fail over time and often requires revision to a fusion. In our clinic, we recommend fusion as the gold standard for end-stage big toe arthritis.

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Dr. Tom Biernacki, DPM

Dr. Tom Biernacki, DPM is a double board-certified podiatrist and foot & ankle surgeon at Balance Foot & Ankle Specialists in Southeast Michigan. With over a decade of clinical experience, he specializes in heel pain, bunions, diabetic foot care, sports injuries, and minimally invasive surgery. Dr. Biernacki is a member of the APMA and ACFAS, and his patient education content on MichiganFootDoctors.com and YouTube has reached over one million views.