JOINTS OF THE WRIST AND HAND
JOINTS OF THE WRIST AND HAND WRIST JOINT 1. Differentiate between and name the bones articulating at the radio-carpal joint and midcarpal joint.
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The wrist joint is a complex consisting of two articulations; o RADIOCARPAL JOINT Situated between the distal radius, articular cartilage and proximal row of carpal bones Moving lateral to medial o Scaphoid o Lunate o Triquetrium o MIDCARPAL JOINT Articulations between proximal and distal rows of carpals Distal surfaces of o Scaphoid o Lunate o Triquitrium Proximal surfaces of o Trapezium o Trapezoid o Capitate o Hamate Note that as the arpal o es are so s all, they are largely overed i hyali e artilage a d do ’t have attachment as a result
a y poi ts for
Pisiform is also not a part of the wrist joint complex – articulates on palmar surface with the triquetrum 2. Classify the joints of the wrist complex in terms of their histological structure. Describe the functional shape of the joint complex and therefore the movements possible. Demonstrate these movements. -
WRIST JOINT COMPLEX o Radiocarpal joint Distal radius articulates with scaphoid most laterally and lunate medially Articular disc articulates with triquetrium o Mid carpal joint Distal end of triquetrium with proximal end of hamate Distal end of lunate and scaphoid with proximal end of capitate Distal end of scaphoid with proximal end of trapezoid and trapezium (most laterally) Radio arpal a d o
o
id arpal joi ts a ’t
ove i depe de tly a d are very o grue t
HISTOLOGICALLY: Both joints are synovial joints Presence of joint capsule, synovial fluid, hyaline cartilages FUNCTIONALLY: Condyloid/ellipsoid SAGITTAL PLANE: o Flexion + extension Greater ROM for flexion –distal projection on posterior aspect of radial articular surface limits extension CORONAL PLANE: o Radial deviation/ abduction + Ulnar deviation/ adduction
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The wrist joint is a complex consisting of two articulations; o RADIOCARPAL JOINT Situated between the distal radius, articular cartilage and proximal row of carpal bones Moving lateral to medial o Scaphoid o Lunate o Triquetrium o MIDCARPAL JOINT Articulations between proximal and distal rows of carpals Distal surfaces of o Scaphoid o Lunate o Triquitrium Proximal surfaces of o Trapezium o Trapezoid o Capitate o Hamate Note that as the arpal o es are so s all, they are largely overed i hyali e artilage a d do ’t have attachment as a result
a y poi ts for
Pisiform is also not a part of the wrist joint complex – articulates on palmar surface with the triquetrum 2. Classify the joints of the wrist complex in terms of their histological structure. Describe the functional shape of the joint complex and therefore the movements possible. Demonstrate these movements. -
WRIST JOINT COMPLEX o Radiocarpal joint Distal radius articulates with scaphoid most laterally and lunate medially Articular disc articulates with triquetrium o Mid carpal joint Distal end of triquetrium with proximal end of hamate Distal end of lunate and scaphoid with proximal end of capitate Distal end of scaphoid with proximal end of trapezoid and trapezium (most laterally) Radio arpal a d o
o
id arpal joi ts a ’t
ove i depe de tly a d are very o grue t
HISTOLOGICALLY: Both joints are synovial joints Presence of joint capsule, synovial fluid, hyaline cartilages FUNCTIONALLY: Condyloid/ellipsoid SAGITTAL PLANE: o Flexion + extension Greater ROM for flexion –distal projection on posterior aspect of radial articular surface limits extension CORONAL PLANE: o Radial deviation/ abduction + Ulnar deviation/ adduction
