Lunate bone

• E Trapezium ( trapezium )
• 1 spoke ( radius) 2 Elle ( ulna ) 3 metacarpal bones ( metacarpals )

The crescent-shaped lunate (Latin lunate or carpal intermedium ) is one of the eight carpal bones and belongs to the proximal ( proximal ) number of these short bones.

It is connected to the body (proximal ) to the radius ( radius) and the hinge plate ( articular disc ). Towards the middle ( medial) it is with the triangle leg ( triquetrum ), side (lateral ) to the navicular ( scaphoid ) and distally (distal ) to the head bone (os capitatum ) and the hamate ( hamate ) in an articulated connection.

Clinic

The lunate bone may be involved in osteoarthritis of the wrist. Rarely, when dropped into a " perilunate dislocation ", in which the remaining carpal bones from the lunate tear that remains firmly attached to the radius and ulna. Due accident caused or rheumatic it can come to destruction of tapes of " scapholunate dissociation " in which can be seen on X-rays, a typical gap between the scaphoid and lunate.

Due to the almost all-round cartilage coating the vascular supply of the lunate is precarious, and it can lead to bone necrosis. This is known for the lunate as Crohn Kienböck or lunatomalacia and occurs ( ulna minus variant) especially in vibration trauma ( jackhammer ) or an anatomical variation with a shorter cubit.