6.5 mm Midfoot Fusion Bolt
Per-Henrik Agren, Andrew Sands
Midfoot Fusion The Midfoot Fusion Bolt (MFB) is a solid 6.5 mm intramedullary implant that can be used to stabilize and fuse the medial columnthe metatarsocuneiform, naviculocuneiform, and talonavicular joints. Alternative uses of the MFB may also be for fusing the lateral column, calcaneocuboid, and 4th metatarsocuboid joint. The MFB aims to achieve permanent fusion of these joints in patients suffering from gross instability such as Charcot neuroarthropathy with or without collapse of the midfoot. The midfoot fusion bolt is a headless solid bolt. It enhances stabilization and alignment, restraining shearing and bending forces better than older implants (I-bolt, 6.5 mm cancelleous screw, and 6.5 mm and 7.3 mm cannulated screws). The MFB is recommended for stabilization of the medial column or fixation of the lateral column. The bones and joints are aligned, measured and drilled with cannulated instruments. The guide wire is removed. The bolt is inserted through the track created by the 5.0 mm drill. Controlled compression may be applied by the T-handle during insertion. After insertion, the bolt head is completely countersunk preventing soft tissue or joint irritation. A blunt tip prevents any damage to soft tissues if the MFB is overinserted.
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