Presentation of biomechanics of wrist joint.PDF

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1. Presentation on
Biomechanics
of Wrist Joint
MADE BY -
ADARSH PATHAK
BPT 3
rd
year

2. CONTENTS
INTRODUCTION
BASIC ANATOMY
LIGAMENTS
MUSCLES
KINESIOLOGY

3. INTRODUCTION
The wrist (carpus) consists of two compound joints : the
radiocarpaland the midcarpaljoints , referred to collectively as
the wrist complex.
The major contribution of the wrist complex seems to be to
control length-tension relationships in multiarticularhand
muscles and to allow fine adjustment of grip.
The wrist muscles appears to be designed for balance and
control rather than for maximising torque production.

4. BASIC ANATOMY OF
WRIST JOINT
Wrist joint is a synovial joint of ellipsoid
variety between lower end of radius and
three lateral bones of proximal row of
carpus.
Articular Surface:
Upper -inferior surface of the lower
end of the radius .
-articular disc of the inferior
radioulnarjoint.
Lower –scaphoid ; lunate ; triquetral
bones.

5. LIGAMENTS
The ligaments of the wrist complex are designated either –
extrinsic orintrinsic.
Extrinsic ligaments are those that connect the carpals to the radius
or ulna proximally or to the metacarpals distally .
Intrinsic ligaments are those that interconnect the carpals
themselves & also known as intercarpal/ interosseousligaments.
VOLVAR CARPAL LIGAMENTS –it has three distinct bands
Radiocapitate; short & long radioulnate; & radioscapholunate.
RADIAL COLLATERAL LIGAMENT to maintain the stability
ULNAR COLLATERAL LIGAMENT at radioulnardeviation

6. On the palmar aspect there are two carpal ligaments :
PALMAR RADIOCARPAL LIGAMENT
PALMAR ULNOCARPAL LIGAMENT
On the dorsal aspect of the joint there is one ligament :
DORSAL RADIOCARPAL LIGAMENT

7. MUSCLES OF THE WRIST COMPLEX
Six muscles have tendons crossing
the volar aspect of the wrist &
therefore are capable of creating
a wrist flexion movement.
Flexor Compartment
Palmaris longus
Flexor carpi radialis
Flexor digitorumprofundus
Flexor digitorumsuperficialis
Flexor policislongus
Flexor carpi ulnaris

8. EXTENSOR COMPARTMENT
The dorsum of the wrist complex is
crossed by tendons of nine muscles.
Extensor carpi radialislongus.
Extensor carpi radialisbrevis.
Extensor carpi ulnaris.
Extensor digitorumcommunis.
Extensor indicisproprius.
Extensor digitiminimi.
Extensor pollicislongus.
Extensor pollicisbrevis.
Abductor pollicislongus.

9. KINESIOLOGY
OSTEOKINEMATICS
Flexion / Extension
Axis -Coronal axis
Plane -Sagittal plane
ROM –(0 -65 -85 ) degree of flexion
 (0 -55 -80 ) degree of extension
Flexion is not pure , it is with ulnar deviation due to oblique
axis.
Ulnar / Radial Deviation
Axis -anteroposterior
Plane -coronal plane

10. ROM -(0 -30 ) degree of ulnar deviation
( 0 -15 -20 ) degree of radial deviation

11. ARTHROKINEMATICS
Wrist Flexion / Extension :
It follows CONVEX -CONCAVE rule.
Roll & Slide will be in opposite direction.
Dorsal Roll -during extension
Ventral Slide -lunate moves on styloidprocess of radius.
Extension at RadioCarpaljoint:
The convex surface of lunate rolls dorsally on radius & slides
ventrally.
Flexion at RadioCarpaljoint :
The convex surface of lunate rolls ventrally & slides dorsally.

12. Extension at MidCarpaljoint :
The convex capitatemoves on concave lunate.
Dorsal roll & Ventral slide.
Flexion at MidCarpaljoint :
Ventral roll & Dorsal slide .
Ulnar Deviation :
Convex -concave rule.
Scaphoid , lunate , triquetrumrolls on ulnar side while slightly
slide away radially in radial carpal joint.

13. Radial Deviation :
The amount of radial deviation is limited into impingment
against styloidprocess .
Therefore , most of the radial deviation occurs at midcarpal
joint & hamate , triquetrumseparate at the end of radial
deviation.

14. THANK
YOU !