Why does midfoot arthritis happen?
There are several joints that lie along the arch. These joints are called the tarsometatarsal joint, thenaviculocunieform, and the talonavicular joint. Their purpose is to adjust to uneven surfaces and to store and absorb energy during the step. The pressure that is applied to the ball of the foot is transferred into the ankle and body through these joints. For very small joints, they really have considerable force going through them.
These joint begin to wear out for a variety of reasons. Trauma can damage them slightly which can begin a progressive deterioration of the joints. Sometimes, the architecture of the foot places more pressure through one portion of the foot causing it to wear. Other times, small amounts of loosening of the joints or slight flattening of the foot can begin the gradual cascade toward arthritis. It is a very common problem especially after the age of fifty.
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