What is a Tarsal Coalition?
A tarsal coalition is an abnormal connection that develops between two bones in the back of the foot (the tarsal bones). This abnormal connection, which can be composed of bone, cartilage, or fibrous tissue, may lead to limited motion and pain in one or both feet.
The tarsal bones include the calcaneus (heel bone), talus, navicular, cuboid, and cuneiform bones. These bones work together to provide the motion necessary for normal foot function.
The ankle joint is composed of the bottom of the tibia (shin) bone and the top of the talus (ankle) bone. The top of the talus is dome-shaped and is completely covered with cartilage—a tough, rubbery tissue that enables the ankle to move smoothly. A talar dome lesion is an injury to the cartilage and underlying bone of the talus within the ankle joint. It is also called an osteochondral defect (OCD) or osteochondral lesion of the talus (OLT). “Osteo” means bone and “chondral” refers to cartilage.
Talar dome lesions are usually caused by an injury, such as an ankle sprain. If the cartilage doesn’t heal properly following the injury, it softens and begins to break off. Sometimes a broken piece of the damaged cartilage and bone will “float” in the ankle.
Tailor’s bunion, also called a bunionette, is a prominence of the fifth metatarsal bone at the base of the little toe. The metatarsals are the five long bones of the foot. The prominence that characterizes a tailor’s bunion occurs at the metatarsal “head,” located at the far end of the bone where it meets the toe. Tailor’s bunions are not as common as bunions, which occur on the inside of the foot, but they are similar in symptoms and causes.
Why is it called a tailor’s bunion? The deformity received its name centuries ago, when tailors sat cross-legged all day with the outside edge of their feet rubbing on the ground. This constant rubbing led to a painful bump at the base of the little toe.
What Is the Tarsal Tunnel?
The tarsal tunnel is a narrow space that lies on the inside of the ankle next to the ankle bones. The tunnel is covered with a thick ligament (the flexor retinaculum) that protects and maintains the structures contained within the tunnel—arteries, veins, tendons, and nerves. One of these structures is the posterior tibial nerve, which is the focus of tarsal tunnel syndrome.
What Is a Fracture?
The structure of the foot is complex, consisting of bones, muscles, tendons, and other soft tissues. Of the 26 bones in the foot, 19 are toe bones (phalanges) and metatarsal bones (the long bones in the midfoot). Fractures of the toe and metatarsal bones are common and require evaluation by a specialist. A foot and ankle surgeon should be seen for proper diagnosis and treatment, even if initial treatment has been received in an emergency room.
A fracture is a break in the bone. Fractures can be divided into two categories: traumatic fractures and stress fractures.
Traumatic fractures (also called acute fractures) are caused by a direct blow or impact, such as seriously stubbing your toe. Traumatic fractures can be displaced or non-displaced. If the fracture is displaced, the bone is broken in such a way that it has changed in position (dislocated).
What Is Acute Inflammation?
Inflammation is the body’s normal protective response to an injury, irritation, or surgery. This natural “defense” process brings increased blood flow to the area, resulting in an accumulation of fluid. As the body mounts this protective response, the symptoms of inflammation develop. These include:
- Increased warmth and redness of the skin
Inflammation can be acute or chronic. When it is acute, it occurs as an immediate response to trauma (an injury or surgery), usually within two hours. When it is chronic, the inflammation reflects an ongoing response to a longer-term medical condition, such as arthritis.
Although inflammation can be caused by an infection, they are not the same and are treated differently. Your foot and ankle surgeon can best determine the cause of your inflamed tissue.