Saddle thumb joint
The thumb saddle joint ( Articulatio carpometacarpalis pollicis , carpometacarpal joint of the thumb ray) is the saddle joint between the large polygonal bone (os trapezium) and the first metacarpal bone . Since the joint has saddle-shaped joint surfaces, it can be moved in two axes, the combination of these two axes enabling mobility similar to a ball joint .
The thumb saddle joint is stabilized by numerous ligaments, the number of which is specified between 5 and 16 depending on the author. The extensor pollicis longus , the extensor pollicis brevis and the abductor pollicis longus (also abductor) muscles are extensors of the thumb saddle joint . Flexors are the flexor pollicis longus , the flexor pollicis brevis , the abductor pollicis brevis muscle (abductor at the same time), the adductor pollicis (also adductor) and the opponens pollicis muscle (abductor at the same time).
An arthrosis of the thumb saddle joint is as rhizarthrosis referred.
Individual evidence
- ^ A b Carl Joachim Wirth: Orthopedics and orthopedic surgery: elbow, forearm, hand . Georg Thieme Verlag, Stuttgart 2003, ISBN 3-13-126211-7 .
- ↑ Ursula Wappelhorst, Andreas Kittelmann, Christoph Röbbelen: Text and workbook functional anatomy . Elsevier, Urban & Fischer Verlag, Munich and Jena 2005, ISBN 3-437-48030-8 .
swell
- Herbert Lippert : Textbook anatomy . Urban & Schwarzenberg, Munich, 2nd edition 1990, ISBN 3-541-10062-1 .
- Wolfgang Dihlmann : Joints - vertebral connections . Georg Thieme Verlag, Stuttgart 2002, ISBN 3-13-132013-3 .