Lunate

Looks like

A half-moon-shaped wrist bone in the middle of the near row, between scaphoid and triquetral.

What it does

Sits under the radius and is central to wrist movement and load transfer.

Keeping it well

It can dislocate after a fall on the hand — often missed — and can lose its blood supply and collapse (Kienböck disease).

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