Purvi shah carpal bone anatomy ppt

Carpal Bone Anatomy Details PPT
Part-4 (UL Bone)
Carpal Bone names, attachments, clinical anatomy, General and specific points.
Carpal bones: 8
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1. Carpal Bone Anatomy Part-4 BY PURVI SHAH B.P.T

2. Carpal Bones Carpus is made up of 8 carpal bones; Which are arranged in two rows. 1.The proximal row contains {from lateral to medial} Scaphoid, Lunate, Triquetral, Pisiform 2.The distal row contains in same order; Trapezium, Trapezoid, Capitate, Hamate

3. Identification Of Carpal Bones Scaphoid bone is boat shape. Lunate bone is half moon shape. Triquetral bone is pyramidal shape. Pisiform bone is pea shape. Trapezium bone is quadrangular shape. Trapezoid bone is shoe of a baby. Hamate bone is wedge shape.

4. General Points The proximal row is convex proximally and concave distally. The distal row is convex proximally and flat distally. Each bone has six surfaces.

5. Specific Points Scaphoid; tubercle is laterally, forward & downward. Lunate; semicircular surface for scaphoid is on lateral side. Triquetral; medial & dorsal surfaces are continuous, non articular. Pisiform; oval facet for triquetral lies on proximal part of the dorsal surface. Trapezium; palmar surface has a vertical groove for the tendon of FCR.

6. Specific Points Trapezoid; distal articular surface is bigger than proximal. Hamate; hook projects from distal part of the palmar surface.

7. Attachments Tubercle of scaphoid- flexor retinaculum, abductor pollicis brevis. Pisiform- FCU, abductor digiti minimi, flexor and extensor retinaculum. Trapezium; abductor pollicis brevis, FPB, FCR, flexor retinaculum. Hamate; FDM, opponens digiti minimi.

8. Clinical Anatomy Fracture of scaphoid is common; Caused by FOOSH Clinical Features: tenderness swelling in the anatomical snuff box pain NOTE: Fracture may deprive the proximal half of bone of its blood supply leading to avascular necrosis.

9. Clinical Anatomy Dislocation of lunate may be produced by a fall on the acutely dorsiflexed hand with forearm flexed. This displaces the lunate anteriorly causing carpal tunnel syndrome.

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