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Ulnar collateral ligament of metacarpophalangeal joint
Not present at the normal location
There is a hypoechoic pseudomass formation just proximal to the metacarpophalangeal joint; abutting metacarpal head.
A bone flake ( about 3 mm ) is present in this pseudomass.
Metacarpophalangeal joint
The wide opening of the ulnar side joint space with abduction stress.
Mild effusion
Proximal phalanx base
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Cortical irregularity due to avulsion
Radial collateral ligament of metacarpophalangeal joint
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Intact with normal echopattern
Flexor tendon
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Normal echopattern.No tenosynovitis.
Extensor tendon
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Normal echopattern
Interphalangeal joint
No effusion
Collateral ligaments are intact.