Authors of section

Authors

Richard Buckley, Andrew Sands, Michael Castro, Christina Kabbash

Executive Editors

Joseph Schatzker, Richard Buckley

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ORIF or MTP joint fusion

1. General considerations

Anatomical considerations

Proper alignment of the metatarsal heads is a critical goal in restoring the pathomechanics of the forefoot. On the AP view, a normal curved “cascade” (Lelièvre’s parabola) appearance, symmetric with the other foot, is mandatory. See illustration. This ensures that the normal length of the metatarsal is restored.

It is also critical to restore the metatarsals in their axial or horizontal plane so that in the axial or tread view all the metatarsal heads are on the same level.

Any malalignment particularly flexion will recreate focally high pressure during the stance phase and toe-off and will result in pain and subsequent callus formation.

Note that for the first ray, it is the sesamoids rather than the first metatarsal head, that bear weight, and therefore one must look at the sesamoid level in establishing the alignment in the axial or horizontal plane of the first metatarsal.

orif lag screw or plate fixation

Preliminary remarks

It is essential to have a healthy soft-tissue envelope prior to open intervention.

Pearl
Look for damage to the plantar plate by assessing sesamoid position on an AP radiograph. Check whether they are spread apart or not. If the volar plate was avulsed, it may interpose itself into the metatarsophalangeal joint and block reduction.

orif or mtp joint fusion

2. Patient preparation

This procedure is normally performed with the patient in a supine position.

orif lag screw or plate fixation

3. K-wire fixation

If the soft-tissue envelope is unsatisfactory for ORIF provisional stabilization of the first MTP joint may be performed with 2.0 mm K-wires.

However, maintaining the percutaneous pinning for six weeks, followed by a trial of nonoperative intervention is acceptable.

orif or mtp joint fusion

4. Open reduction internal fixation

Approach

For open reduction and fixation a dorsal approach to the first metatarsal may be used.

If soft tissues are satisfactory then immediate reduction may be performed. Usually mini fragment fixation (2.0 mm) can reduce and fixate these fractures.

1st head intraarticular comminuted

5. Fusion of MTP joint

If fusion is necessary because the bone stock is unsatisfactory, then this can be performed once the soft tissue swelling has resolved. Fusion of the first MTP joint is rarely recommended.

Because this is an intraarticular fracture some joint incongruity is inevitable and pain and stiffness may follow. This would require secondary reconstructive surgery.

6. Aftercare

Maintain weight bearing in a flat, rigid sole shoe for six weeks or until union. Then splint or tape toe for an additional six weeks to maintain alignment.

orif or mtp joint fusion