<unk>  is the abnormal fusion of two or more<unk>  bones when they fail to segment during intrauterine development. First described by Eduard Sandifort in 1779,<unk> s are often an isolated issue which connect two<unk>  bones in the same row of the wrist. These issues are congenital and occur at various rates throughout the population.
Carpal coalition
Tarsal coalition
Back strain
Fibrous ankylosis
Calcaneal spur
Radioulnar synostosis
Radial dysplasia
Calcaneal fracture