Anatomically, the abnormal connecting 'bridge' is virtually all cartilage in the young child, often nearly all bone in an adult and a mixture as the skeleton ossifies in between these ages. Some fibrous tissue (like gristle) is often also involved. When the bridging link becomes bony enough, it results in a limitation of motion and this brings about the onset of pain. The bones of the tarsus are the rear most bones in the adjacent diagram: calcaneus, talus, navicular, cuboid, medial cuneiform, intermediate cuneiform and lateral cuneiform bones. These bones create the two major foot joints – the subtalar and midtarsal joints – that allow complex motions to occur in the feet. These motions are necessary for such activities as walking over uneven terrain and creating a gait that allows normal function of the knees, hips, back, etc.
Tarsal coalition
Carpal coalition
Bimalleolar fracture
Back strain
Clavicle fracture
Calcaneal fracture
Joint dislocation
Greenstick fracture