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This is a common problem that can affect the joints and bones of the metatarsals. Metatarsalgia is most often localized to the first metatarsal head – the ball of the foot just behind the big toe. There are two small sesamoid bones under the first metatarsal head. The next most frequent site of metatarsal head pain is under the second metatarsal.
The metatarsophalangeal joints (MTP joints) are the joints between the metatarsal bones of the foot and the proximal bones (proximal phalanges) of the toes.They are analogous to the knuckles of the hand, and are consequently known as toe knuckles in common speech.
Morton's toe is the condition of having a first metatarsal bone that is shorter than the second metatarsal (see diagram). It is a type of brachymetatarsia. [1] This condition is the result of a premature closing of the first metatarsal's growth plate, resulting in a short big toe, giving the second toe the appearance of being long compared to the first toe.
Type A2 is a very rare form of brachydactyly. The phalanges of the index fingers and second toes are shortened. [9] Type A3, BDA3: 112700: HOXD13: Brachydactyly type A3, brachymesophalangy V or brachydactyly-clinodactyly. Type A3 only shortens the middle bone of the little finger. [9] Type A4, BDA4: 112800: HOXD13: 2q31-q32
X-ray showing measurements of HV and IM angles of hallux valgus. Bunions can be diagnosed and analyzed with a simple x-ray, which should be taken with the weight on the foot. [10] The hallux valgus angle (HVA) is the angle between the long axes of the proximal phalanx and the first metatarsal bone of the big toe.
Surgery is also an option, if the pain and discomfort cannot be treated, or for cosmetic reasons. In this procedure, the short metatarsal is typically cut and a piece of bone is grafted between the two ends. In some cases, an external fixator may be attached to the metatarsal with pins. Within the external fixator is an adjustable screw that ...
The only movements permitted in the joints of the digits are flexion and extension; these movements are more extensive between the first and second phalanges than between the second and third. The flexor hallucis longus and flexor digitorum longus flex the interphalangeal joint of the big toe and lateral four toes, respectively.
For a minority of people, the little toe also is missing a middle bone. The hallux only contains two phalanx bones, the proximal and distal. The joints between each phalanx are the interphalangeal joints. The proximal phalanx bone of each toe articulates with the metatarsal bone of the foot at the metatarsophalangeal joint.