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Bunion Surgery - Distal Head Procedures

Written By: Kenneth Oglesby, D.P.M. & John Giurini, D.P.M. Editor, PodiatryNetwork.com

Description

First metatarsal neck osteotomies are known by various names based on the individual who first described the procedure (e.g. Austin, Reverdin-Green, Kalish-Austin). Regardless of the procedure, the goal of all these procedures is the same; to remove the bump and realign the joint. The first part of all bunion procedures involves removing the bump of bone from the side of the 1st metatarsal head. This is performed in a manner so as not to damage the viable part of the joint and not to leave any irregularities of bone that can cause future irritation in shoes. Once this is completed, the podiatric surgeon will create an osteotomy (bone cut) through the first metatarsal that will allow shifting the bone and realigning the joint. Depending on the type of osteotomy, the actual shape of the bone cut can vary. In the case of the Austin bunionectomy, the bone cut is V-shaped with the “V”sitting on its side and the tip of the “V” pointing toward the joint. When this cut is completed, the head of the metatarsal and joint is shifted toward the 2nd toe. In this way the bone and joint are repositioned in a more normal position. The Reverdin-Green osteotomy is made in a similar location but is trapezoidal in shape rather than V-shaped. Both these procedures are stable bone cuts and provide good correction of mild to moderate deformities. The Kalish-Austin bunionectomy is a modification of the Austin bunionectomy. It also is a V-shaped bone cut but is typically used for greater degrees of bunion deformities.

Because bone is cut and repositioned, it is often preferred to fixate or hold the bone in place with some external device. In the case of the Austin and Reverdin-Green osteotomies, this is most often accomplished by the use of a stainless steel pin across the bone cut. This prevents accidental displacement and loss of correction. Over the past 5 years, it has become increasing more advantageous to use small stainless steel or titanium screws to provide compression of the bone and to hold the bone in position. This is the main advantage of the Kalish-Austin bunionectomy. By using the screws, bone will heal faster and will allow for earlier ambulation. The screws are typically left in permanently unless they cause irritation of the soft tissues while the pins are generally removed in the office setting in three to four weeks following the day of surgery. The surgery is generally performed as an outpatient in a hospital or out patient surgery center. Some surgeons will perform this procedure in their office. Anesthesia is the choice of the surgeon made in consultation with the patient and anesthesiologist. Anesthesia may be a general anesthesia, twilight anesthesia or a local anesthesia.

Post Operative Care

The postoperative course and rehabilitation following bunion surgery depends on the procedure and can vary amongst podiatric surgeons. Patients have varying levels of postoperative pain but quite often the pain is significantly less than what the patient anticipates. A period of total non-weight bearing with crutches may be recommended in the first 3 to 5 days. In many instances, the surgeon may allow the patient to bear full weight in a postoperative surgical shoe. In all cases patients are instructed to limit their activities and to elevate their feet above their heart during the first 3 to 5 days. After this, a resumption of gradual weight bearing with a special surgical shoe is begun. Walking without the postoperative shoe is strictly prohibited. In cases where a pin is used, return to full weight bearing with a stiff soled walking shoe is allowed after the pin has been removed, generally in 3 to 4 weeks following the bunion surgery. Screws provide increased stability when used to fixate bone cuts and most patients can return to full weight bearing and regular shoes in 3-4 weeks following the surgery. The postoperative and rehabilitative course is improved by the use of ice and elevation of the extremity as much as possible. One of the most important aspects of the postoperative treatment is early motion of the joint to prevent joint stiffness. In most cases, range of motion exercises are begun almost immediately following surgery. No matter what the form of bone fixation is used, pins or screws; bone healing will take 6 to 8 weeks or longer. During this period of time it is important that the patient not walk without shoes or in thin-soled shoes or sandals. Should the patient risk walking without an adequately supportive shoe, they risk re-fracturing the bone and increase the duration of excessive swelling during the healing phase.

Possible Complications

Complications following bunion surgery are uncommon but may include infection, suture reaction, delayed or nonunion of the osteotomy, irritation from the pin or screws, stiff joint or recurrence of the deformity. Recurrence of the deformity can be halted or slowed with the use of functional foot orthotics. It is important to realize that surgery does not correct the cause of the bunion deformity. Functional foot orthotics however do address the cause of the deformity and their use are strongly encouraged following bunion surgery. A rare complication is the over correction of the bunion deformity. This condition, called Hallux Varus, may require additional surgery for its correction

This article should serve as a guideline for patients who are contemplating bunion surgery. The most commonly performed procedures for treatment of bunions have been discussed here. Procedures are selected based on surgeon's experience and preference. Patients are encouraged to discuss the surgery, the postoperative course and possible complications with their podiatric surgeon openly before consenting to surgical intervention.

Glossary of Terms
Bunion Bump on the side of the foot at the base of the great toe
Bursitis An inflammation of a fluid sac often found overlying a bunion
Fixation Act of holding bones together, commonly require external devices such as pins, screws or plates
Hallux abductovalgus (HAV) Medical term describing the deviation of the great toe toward the 2nd toe; common component of bunions
Metatarsal A long bone of the foot that forms the ball of the foot
Orthoses Devices made from a mold of the foot used to control abnormal motion of the foot; may be prescribed to prevent progression of bunion deformity
Osteotomy Surgical procedure that creates a cut in a bone to achieve realignment; a "surgical fracture"
Pronation Motion of the foot which when excessive results in flattening of the arch; one possible cause of bunion formation
Toe box Part of the shoe that covers the toes

About the Authors:
Kenneth W. Oglesby, D.P.M., Second-year podiatric surgical resident, Beth Israel Deaconess Medical Center, Boston, Mass.
John M. Giurini, D.P.M., Chief, Division of Podiatry, Beth Israel Deaconess Medical Center, Boston, Mass., Assistant Clinical Professor of surgery, Harvard Medical School, Boston, Mass.

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