Entrapment Syndromes
Median Nerve Entrapment (Pronator Syndrome )
Injury proximal to Elbow - Involvement of Wrist , Fingers and Thumb
Injury on proximal forearm -- Wrists spared
Injury on Wrist - thenar group of muscles involved
Benediction sigh - High median nerve injuries .
D/D
1. Bicipital Tendinitis
resisted elbow flexion illicits pain
2. Resisted Pronation
with a finger 3 finger breadth below elbow crease illicits pain
Radial Tunnel Syndrome
PIN compression at Arcade of Forhse
4 fingers below lateral epicondyle illicits tenderness.
Resisted long finger extension test - finger and wrist at 30 degrees extension - give pressure to flex MCP passively.
a severe PIN compression , ECU doesnot function and wrist goes into radial deviation.
Note
Brachioradialis , ,ECRB , ECRL lie proximal to radial tunnel .
ECU , EDC , EPL and EPB lie distal to Radial tunnel .
Anterior Interosseous Nerve (AIN ) -
Aching pain simiilar to that of pronator syndrome . aching pain in proximal forearm.
Weakness - FPL , FDP to IF and Pronator quadratus - Ok sign +ve
Cubital Tunnel Syndrome
Repititive movement, RA , OA , Fracture , Dislocation , Cubitus Valgus , Instability , Anconeus Epitrochlearis crossing nerve in region of medial epidondyle
Inspection - Clawing of fingers, atrohpy of hypothenar muscles
Palpation - Ulnar Nerve
Tinel's sign - tip of long finger suggestive of irritation of nerve
(radiating pain distally )
Instability - palpae elbow - flexion / extension
Compression test
holding more or upto 1 min with elbow in maximum flexion leads to paresthesiae of
LF and RF
Finger abductioon / adduction (intrinsic weakness )
FDP - RF / LF weakness
FDP - LF , RF and Wrist flexion in radial deviation
weakness suggestive of compression proximal to wrist.
High lesion - ulnar clawing
claw hand - weakend lumlbricals allow MCP hyperextension and it inhibits full extension of PIP
joint .
Bovier's test for claw hand - examiner passively prevents MCP hyperextension allowing PIP to fully extend.
Investigation
X-ray
RBS
TFT
NCS , EMG
USG / MRI
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