tarsal coalitions

tarsal coalitions

; tarsal fusion; peroneal spastic flat foot synchondrosis of two or more tarsal bones due to conjunction of two or more midfoot and/or rearfoot bones because of failure of development of the intervening joint/s; normally asymptomatic during early childhood; becomes symptomatic (and painful) after fibrous/cartilaginous synchondrosis undergoes ossification, with resultant loss of normal interosseous movement, fixed heel eversion, loss of height of medial longitudinal arch, adaptive painful peroneal muscle spasm with shortening of peroneal tendons (hence the name peroneal spastic flat foot); tarsal coalitions affect 1-4% of population; talocalcaneal, calcaneocuboid and calcaneonavicular coalitions are most common presentations