Anatom3DLeft first metacarpal bone
Os metacarpi I sinistrum · Levá první záprstní kost
Skeleton
Looks like
The short, thick palm bone of the thumb, between the trapezium and the thumb's first phalanx.
What it does
Gives the thumb its wide range of movement through the saddle joint at its base.
Keeping it well
Fractures at its base (Bennett fracture) enter the joint and often need surgery.
Related conditions
- Acromegaly
- Carpal tunnel syndrome
- De Quervain's tenosynovitis
- Dupuytren's contracture & trigger finger
- Fractures
- Fragility fracture
- Frailty & falls in older age
- Ganglion cyst
- Hyperparathyroidism
- Juvenile idiopathic arthritis
- Osteogenesis imperfecta (brittle bone disease)
- Osteomalacia & rickets
- Osteomyelitis (bone infection)
- Osteoporosis
- Paget's disease of bone
- Pseudogout (calcium pyrophosphate disease)
- Raynaud's phenomenon
- Repetitive strain & overuse injury
- Rheumatoid arthritis
- Sarcoma
- Vitamin B1, C and other deficiencies
- Vitamin D deficiency