When is a big toe fusion needed?

The joint at the base of the big toe — the first metatarsophalangeal (MTP) joint — carries a remarkable load. Every step you take pushes off through it. When its cartilage wears out (hallux rigidus, arthritis of the big toe), the joint becomes stiff and painful, a bony bump forms on top, and push-off starts to hurt.

For early arthritis, options like shoe modifications, orthotics, injections, or a cheilectomy (removing the bone spur) can work well. But when the cartilage is largely gone — advanced hallux rigidus, severe or recurrent hallux valgus with arthritis, or a failed previous bunion surgery — fusion (arthrodesis) of the first MTP joint remains the most reliable operation. By joining the two bones into one solid, well-aligned unit, it eliminates the painful joint altogether while preserving a strong, stable push-off.

What is MIS first MTP fusion?

Traditionally, this fusion is done through a long incision over the top of the toe, opening the joint widely to remove the remaining cartilage. The minimally invasive (MIS) technique achieves the same goal through a few 3–5 mm skin incisions.

Using a fine, specialized bone burr under real-time X-ray (fluoroscopic) guidance, the surgeon removes the damaged joint surfaces percutaneously, positions the big toe at the ideal angle for walking and footwear, and fixes it — typically with two crossed screws placed through small stab incisions. The joint capsule and surrounding soft tissues are largely preserved.

Why minimally invasive?

Less soft-tissue disruption — the extensor tendons and skin envelope are spared, which matters especially in older patients or those with fragile skin and circulation.

Smaller wounds, fewer wound problems — a particular advantage for patients with diabetes, rheumatoid arthritis, or previous incisions around the joint.

Comparable fusion rates — published series report union rates of roughly 90–95%, in line with open surgery, with similar deformity correction and pain relief.

Early weight-bearing — stable screw fixation usually allows protected heel weight-bearing in a stiff-soled postoperative shoe soon after surgery.

Won’t I miss the joint motion?

This is the most common question I hear. The honest answer: by the time fusion is indicated, the joint has usually lost most of its useful motion already — what remains is stiff and painful. After a well-positioned fusion, patients walk without pain, most return to hiking, golf, cycling, and gym work, and the adjacent joints compensate for the small loss of bend. High heels above 4–5 cm and deep squatting on the toes are the main long-term limitations.

What to expect after surgery

For the first two weeks, the foot is protected while the small wounds heal, with weight on the heel in a stiff-soled postoperative shoe. From two to six weeks, walking in the postoperative shoe continues as the fusion consolidates, with X-rays checked at follow-up visits. From about six to eight weeks, once healing is confirmed, most patients transition back into regular comfortable footwear and gradually resume full activity.

The screws are usually left in place permanently. If hardware ever causes irritation, it can be removed once the fusion is solidly healed. Recovery timelines vary from person to person, and your progress will be reviewed at each visit.

Related reading: MIS Bunion (MITA)