Stack #236584
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| most commonly fractured handbone | navicular aka scaphoid
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| most commonly dislocated/2nd most commonly fractured | lunate
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| pisiform is within what tendon | flexor carpi ulnaris
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| largest carpal bone | capitate-lies proximal to 3rd metacarapal
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| hamate forms lateral border of the tunnel of guyon which __- | transports the ulnar nerve and artery to the hand
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| T/F: ulna articulates with wrist | False, only radius does
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| two smalls seasamoid bones are located over the palmar aspect of the distal end of the 1st metacarpal. Help improve mechanical line of pull for the __ | flexor pollicus brevis
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| borders of anatom snuffbox | abductor pollicis longus and extensor pollice brevis (radially) and extensor pollicis longus (medially)
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| Radial Collateral- Attaches radial styloid process to ___ | navicular and trapezium
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| Palmar (volar) radiocarpal-most important ligament for __, limits___-originates from anterior surface of the radius and splits into three individual segments each with its own name | controlling motion and wrist stability- limits hyperextension
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| Dorsal radiocarpal-major dorsal ligament, limits __ | wrist flexion
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| Triangular fibrocartilagenous complex | disk is at the end of the ulna with attachment to the radius – major stabilizer for the radioulnar joint-injuries to this are very disabling
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| -Volar plate | reinforces palmar aspect (anterior), has attachment phalanx to phalanx
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| UCL of Thumb -primary stabilizer of the thumb, controls stability during all ___ activities | gripping actions and opposition
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| Inhibition of the median nerve results in atrophy of the thenar eminence musclesExtensor muscles draw the thumb in the same plane as the fingers and the patient cannot flex or oppose their thumbextension of the thumb and alignment in the same plane | ape hand
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| result of Ulnar nerve palsy – atrophy in the hypothenar region including the dorsal interossei, 4th and 5th lumbricalesoccurs in the Tunnel of Guyon which is where the ulnar nerve runs between the hamate and pisiform bones | Bishop’s (Benediction)
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| both the median and ulnar nerves are injured and there is paralysis of all lumbricale and interossei musclescharacterized by hyperextension of the MCP joint and flexion of the PIP and DIP joints | claw hand
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| a decrease in blood supply to the forearm muscle, characterized by a flexion contracture of the wirst and fingers, results from possible forearm fracture: fracture/dislocation of the elbow; forearm compartment syndrome) | Volkmann’s contracture
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| injury to the UCL of the MCP joint of the thumb | gamekeeper's thumb aka skier's thumb
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| s/s of gamekeepers thumb | pain, swelling, instability, positive valgus stress test- complication known as a Stener lesion in which the adductor pollicis comes between the ruptured ends of the ligament and prevent healing
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| moi of gamekeepers thumb | forced abduction
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| hyperextension of the PIP joint | volar plate rupture
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| s/s of volar plate rupture | pain, tenderness over the palmar aspect of the joint, swelling, loss of function
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| hyperflexion of the DIP joint due to tensioning of the flexor tendon | swan neck deformity
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| complication (from a proximal rupture of the volar plate) is ‘____characterized by a flexion contracture | pseudoboutonniere deformity
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| flexor digitorum profundus tendon rupture | jersey finger
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| moi of jersey finger | distal phalanx is forcefully extended while the finger is flexing
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| rupture of the distal extensor tendon (associated bony avulsion possible) | Mallet finger (or baseball finger)
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| moi of mallet finger | the extended distal phalanx is suddenly and forcefully flexed
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| - involves the base of the first metacarpal bone resulting in displacement of the metacarpal due to the pull of the abductor pollicis longus muscle | Bennett’s fracture
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| - fracture of the distal radius and ulna - MOI: fall on an outstretched hand- characterized by a ‘silver fork deformity’ or dorsal displacement of the distal fragments of the radius and ulna in relation to their proximal shaft | Colle’s fracture
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| fracture with displacement of the fracture being volar to the proximal fragment | smith's fracture
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| herniation of synovial fluid through the joint capsule of synovial sheath of a tendon- may occur acutely or can be chronic- observable and palpable mass over the wrist, may or may not be painful and restrict ROM | ganglion cyst
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| a flexor contracture seen more commonly in older adults- etiology in unknown and is characterized by a flexion contracture of the MCP and PIP joints usually of the 4th and 5th digits as a result of thickness and contracture of the palmar fascia | Dupuytren’s contracture
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| tenosynovitis of the of the flexor tendons resulting from repetitive trauma- most commonly seen in the third and fourth digits | trigger finger
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| tynosynovitis of the abductor pollicis longus and extensor pollicis brevis tendons; - S&S: tenderness and crepitus at the base of the thumb, weakness of involved muscle; positive Finkelstein test | DeQuervain’s disease
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| forced flexion of the PIP joint resulting in a tear of the central slip of the extensor digitorum tendon at its insertion in the base of the middle phalanx and volar displacement the lateral bands | Boutonniere deformity
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