X-ray (perform before joint stressing)
There is a high association with avulsion fractures from insertion of UCL into proximal phalanx
Proximal phalanx volar subluxation and radial deviation suggests complete UCL<unk> 
Apply radial stress to the thumb with MCP in partial flexion
Compare relative laxity to other thumb.
>35 degrees of joint laxity or 15 degrees of releative laxity compared to other thumb is diagnostic of a complete UCL<unk> 
There is a high association with avulsion fractures from insertion of UCL into proximal phalanx
Proximal phalanx volar subluxation and radial deviation suggests complete UCL<unk> 
This phenomenon occurs when there is a UCL tear that results in entrapment of the adductor pollicis aponeurosis within the UCL. Clinically characterized by extensive laxity on stress testing of the thumb MCP.  Patients will require surgical repair
Metacarpophalangeal ulnar ligament rupture
Distal finger
Metatarsophalangeal joint sprain
Finger amputation
Ankle syndesmosis injury
Fingertip laceration
Acromioclavicular joint injury
Nail avulsion