Brunnstrom’s Clinical Kinesiology
Transcript of Brunnstrom’s Clinical Kinesiology
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Brunnstrom’s Clinical Kinesiology
5th Edition
The Wrist and Hand
Smith • Weiss • Lehmkuhl
OVCMT MS3 November 2012
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Joints of the Wrist
Two joints to consider • Radiocarpal • Midcarpal The basic function of the wrist is to
control the length-tension relationship of the extrinsic hand muscles to maximize balance and control of the hand
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Radiocarpal Joint
Closed pack position • Full extension with radial
deviation Capsular pattern
• Flexion=extension Typical dislocation
• Lunate moves anteriorly into carpal tunnel: most carpals move posteriorly
Joint type • Condyloid synovial
Five Main Ligaments • Ulnar/medial collateral lig • Radial/lateral collateral
lig • Ulnocarpal lig • Anterior and posterior
radiocarpal lig
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Ligaments & Capsule of the Radiocarpal Joint
medial / ulnar collateral lateral / radial collateral
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Ligaments & Capsule of the Radiocarpal Joint
ulnocarpal ligament (anterior and posterior)
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Ligaments & Capsule of the Radiocarpal Joint
posterior & anterior radiocarpal ligament
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Movements – Radiocarpal Joint motion at the wrist occurs in
combination at the radio- and mid- carpal joints
flexion - extension • occur around a medial lateral axis in the
sagittal plane • flexion > extension; ~85° flx, 75° ext
radial - ulnar deviation • occur around an anterior posterior axis in a
frontal plane • ulnar deviation > radial deviation; ~40º
ulnar, 20° radial
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Intercarpal/Midcarpal Joint Closed pack position
• Extension with radial deviation Capsular pattern
• Flexion=extension Typical dislocation
• Most carpals move posteriorly Joint type
• Plane or Condyloid synovial joint (concave-convex may apply)
Boat load of ligaments • Interosseus ligaments
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Intercarpal/Midcarpal Joint Articulating Surfaces
• proximal row of carpals- scaphoid, lunate, triquetrum (concave)
• distal row of carpals- trapezium, trapezoid, capitate, hamate (convex)
Classification • nonaxial plane synovial joint
Movements Permitted • gliding • intercarpal motion augments that at
the wrist
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Radiocarpal Joint Motion
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Relevant Muscles of the Wrist
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Joints of the Hand
Three to consider: • carpometacarpal • metacarpophalangeal • interphalangeal
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Carpalmetacarpal Joint Closed pack position
• thumb- full opposition; digits- full flexion Capsular pattern
• thumb- abduction > extension; digits- all motions equally
Typical dislocation • uncommon, carpal dislocation or metacarpal fracture
Joint type 1st CMC • saddle synovial • articulation between 1st MC and trapezium;
incongruence here may account for or be a result of increased incidence osteoarthritis
• three main ligaments lateral collateral lig. anterior and posterior CMC lig.s interosseous CMC lig.s
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Carpometacarpal (CMC) Joint
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Carpometacarpal (CMC) Joint 1st Carpometacarpal Joint Movements Permitted
• flexion – extension; anterior posterior axis, frontal plane
• abduction – adduction; medial lateral axis, sagittal plane
• opposition (combination motion of abduction and flexion)
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Carpometacarpal (CMC) Joint 2nd - 5th carpometacarpal joint Joint Type- plane synovial (2nd - 4th) and saddle
synovial (5th) • base of 2nd MC with trapezoid • base of 3rd MC with capitate • base of 4th MC with capitate and hamate • base of 5th MC with hamate
• fixed carpal arch is an anterior concavity formed by the
distal row, a concavity which persists even when the palm is flattened; contributes to optimal grip
Movements Permitted • gliding as with flexion - extension and radial - ulnar
deviation • ROM available at the CMC joints increases toward the
ulnar side with the 2nd and 3rd joints being a stable point around which others move
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Carpometacarpal Joint Ligaments
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Metacarpophalangeal (MCP) Joint Closed pack position
• thumb- full opposition; digits- full flexion Capsular pattern
• flexion > extension Typical dislocation
• proximal phalanx moves posterosuperior, 2nd and 5th digits are most commonly dislocated
Joint type • condyloid synovial • volar fibrocartilagenous plate
limits hyperextension and prevents impingement of the flexor tendons in the joint during flexion
increases joint congruency (MC head has much larger articular surface than base of proximal phalanges)
• transverse metacarpal lig. binds MC heads together anteriorly supports CMC joints
• lateral / radial and medial / ulnar collateral lig.s limits lateral motion and holds volar plate on joint slack in MCP extension
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Ligaments & Capsule
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Metacarpophalangeal (MCP) Joint Articulating Surfaces
• head of metacarpal (convex) • base of proximal phalanx (concave)
Classification • (biaxial condyloid synovial joint)
Movements Permitted • flexion – extension; mediolateral axis, sagittal plane • ROM: ~90-110° flexion and extension is consistent
between MCP joints but varies between people; increases toward the ulnar side
• abduction – adduction; anteroposterior axis, frontal plane
• ROM: maximal in extension • reference point is the 3rd digit
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Interphalangeal Joints Closed pack position
• Full extension
Capsular pattern • flexion > extension
Typical dislocation • posterior displacement of the phalanx
Joint type • hinge synovial • Ligaments:
volar fibrocartilagenous plate collateral lig.s
• remain taut and provides support in all joint positions
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Ligaments & Capsule
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Proximal and Distal Interphalengeal (PIP & DIP) Joint
Movements Permitted • flexion – extension • ROM increases ulnarly and at the PIPs versus
DIPs • total range at 2nd digit PIP ~100°, 2nd digit
DIP ~80° • 5th digit PIP ~135°, 5th digit DIP ~90° • the additional ROM at all the joints of the
ulnarly located fingers angles them toward the thumb which facilitates opposition and allows a tighter grip on the ulnar side of the hand
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Relevant Muscles of the Fingers
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Postures & injuries
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Prehension
Power Grip
Precision Handling