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Brachymetatarsia

This condition refers to an abnormally shortened metatarsal bone. This is generally caused by a premature closure of the growth plate of the metatarsal. While the remaining metatarsals continue to grow at a normal rate, the affected bone will remain the same size. With time, this causes a visible difference in the appearance of the toes around the time of early puberty.

Most commonly, the fourth metatarsal is affected, resulting in a the appearance of a short forth toe.

Brachymetatarsia 4th Shortened fourth metatarsal

Tension Stress Effect

We owe a great deal of acknowledgment to the work done by the Russians regarding ground breaking work in the area of treating severe structural abnormalities utilizing a concept known as the the "tension stress effect." This concept, developed by Dr. Ilizarov, focused on the bodies ability to "grow" new bone in a widening distraction gap under controlled mechanical means.

Dr. Ilizarov Dr. Ilizarov and patient

Mechanism of Action

Danis A.: Mechanism of bone lengthening by Ilizarov technique. Bull Mem Acad R Med Belg 2001

Utilizing the these principles, it is possible to lengthen bones which are abnormally short and restore the appropriate length. In the forefoot this technique can be applied both to congenitally short bones as well as shortening due to surgical complications.

Brachymetatarsia 4th post correction Elongated forth metatarsal

Surgical Details

Goals

Proper communication between the podiatric surgeon and the patient is critical. The patient will play an active role in the surgical outcome and commitment to perform daily distraction is critical. Nicotine use has been shown to impede bone healing. Since this procedure involves a complex biological cascade of events with each step dependent on the preceding, smoking cessation is required.

A mini external fixator is place over the bone to be lengthened. A small surgical cut in the bone is performed. After 7-14 days, the patient will turn a tiny wheel on the mini fixator twice a day. Turning the wheel will slowly move the bone. The gap that is created will fill in with newly grown bone. The number of days required to distract the bone is dependent on the amount of lengthening required. A good rule of thumb is about 0.5 cm (0.2 inches) of lengthening per day.

Brachymetatarsia with mini rail external fixator Xrays showing progression of bone lengthening metatarsal osteosynthesis ossification Xrays showing maturation of new bone Brachymetatarsia before and after osteosynthesis Xrays showing before and after Brachymetatarsia picture of before and after osteosynthesis Before and after
Dr. Richard Perez, DPM - San Antonio Podiatrist Foot Doctor
This content was authored by: Dr. Richard Perez

Dr. Perez is board certified by the American Board of Foot & Ankle Surgery and a Fellow of the American College of Foot and Ankle Surgeons. His clinical interest include sports injuries, aesthetic bunion surgery, heel pain and resident education.