Anatom3DTrapezium
Os trapezium · Kost trapézová
Skeleton
Looks like
A saddle-shaped wrist bone in the far row at the base of the thumb.
What it does
Forms the saddle joint with the thumb metacarpal that lets the thumb swing across the palm.
Keeping it well
The joint here is a very common site of osteoarthritis, especially in women after 50: pain on pinching or opening jars.
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