Overview
Hammer toe is foot deformity that typically affects second, third or fourth toes. The condition is called hammertoe because of the unnatural position your toes form. Hammertoe causes your toe to bend upward at the middle joint in a way that looks similar to a hammer. While it may not be painful at first, this condition usually worsens with time and it becomes difficult to extend your toes. Sometimes, calluses or corns form in association with hammertoe.
Causes
If a foot is flat (pes planus, pronated), the flexor muscles on the bottom of the foot can overpower the others because a flatfoot is longer than a foot with a normal arch. When the foot flattens and lengthens, greater than normal tension is exerted on the flexor muscles in the toes. The toes are not strong enough to resist this tension and they may be overpowered, resulting in a contracture of the toe, or a bending down of the toe at the first toe joint (the proximal interphalangeal joint) which results in a hammertoe. If a foot has a high arch (pes cavus, supinated), the extensor muscles on the top of the foot can overpower the muscles on the bottom of the foot because the high arch weakens the flexor muscles. This allows the extensor muscles to exert greater than normal tension on the toes. The toes are not strong enough to resist this tension and they may be overpowered, resulting in a contracture of the toe, or a bending down of the toe at the first toe joint (the proximal interphalangeal joint) which results in a hammertoe.
Symptoms
The most common symptoms of hammertoes include. The toe is bent upward at the middle toe joint, so that the top of this hammertoe joint rubs against the top of the shoe. The remainder of the toe is bent downward. Pain upon pressure at the top of the bent toe from footwear. The formation of corns on the top of the joint. Redness and swelling at the joint contracture. Restricted or painful motion of the toe joint. Pain in the ball of the foot at the base of the affected toe. This occurs because the contracted digit puts pressure on the metatarsal head creating callouse and pressure on the ball of the foot.
Diagnosis
Your doctor is very likely to be able to diagnose your hammertoe simply by examining your foot. Even before that, he or she will probably ask about your family and personal medical history and evaluate your gait as you walk and the types of shoes you wear. You’ll be asked about your symptoms, when they started and when they occur. You may also be asked to flex your toe so that your doctor can get an idea of your range of motion. He or she may order x-rays in order to better define your deformity.
Non Surgical Treatment
In the earlier stages of hammer toe, when the toes can still be manually straightened, then conservative treatment is appropriate. This means wearing shoes which are a half size bigger than normal and which are not narrow around the toes. Exercises to stretch the toes out and strengthen the muscles under the foot which balances the tightness of the top tendons are important. Padding or corn plasters can be used to ease the discomfort of any associated corns and calluses.
Surgical Treatment
Joint resection procedures involves removing part of one of the two small joints of the toe directly underneath where the digit is crooked. The purpose is to make room for the toe to be re-positioned flat or straight. Because hammer toes become rigid or fixed with time, removing the joint becomes the only option when the knuckle is stiff. Its important to understand that this procedure does not involve the joint of the ball of the foot, rather the a small joint of the toe. Medical terminology for this procedure is called a proximal interphalangeal joint arthroplasty or a distal interphalangeal joint arthroplasty, with the latter involving the joint closer to the tip of the toe.
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