Congenital malformations, deformities, and chromosomal abnormalities (Q00-Q99).
- Brachymetatarsia – relatively rare congenital bone growth disorder; most commonly affects the fourth metatarsal, which stops growing in length earlier than the other bones; most likely autosomal dominant inheritance
- Hollow foot (pes cavus or pes excavatus).
Musculoskeletal system and connective tissue (M00-M99).
- Arthritis (inflammation of the joints), unspecified.
- Osteoarthritis (wear and tear of the joint), unspecified (e.g., metatarsal arthrosis)
- Bursitis (bursitis) under the metatarsal heads.
- Hallux rigidus – arthritic changes stiff big toe metatarsophalangeal joint.
- Hallux valgus (synonyms: bunion; crooked toe).
- Capsulitis (capsulitis)
- Small toe deformity
- Osteonecrosis (circumscribed cartilage tissue damage) of the metatarsal head (Köhler’s disease II – aseptic bone necrosis in the head of the ossa metatarsalia II-IV (metatarsus); more common in young girls).
- Synovitis (synovitis) of the metatarsophalangeal joints of the small toes.
- Tendinitis (tendonitis)
Psyche – nervous system (F00-F99; G00-G99)
- Morton’s neuralgia (synonyms: Morton’s metatarsalgia, Morton’s syndrome, or Morton’s neuroma) – nerve compression syndrome of the interdigital nerves (nerve branches of the medial plantar nerve and lateral plantar nerve that run between the metatarsals) due to displacement of the nerve-vascular bundle (esp. In the interdigital space D3/4), usually with accompanying bursitis (bursitis); leads to irritation of the nerves of the sole of the foot, which causes seizure-like pain in the area of the metatarsal bones.
Injuries, poisonings and other consequences of external causes (S00-T98).
