Allman and Tossy classification for Acromioclavicular joint injury

Normal acromioclavicular joint.

There are several classification systems for acromioclavicular joint injury grading,

Allman and Tossy classification

* grade I

•  mild sprain
•  normal plain film findings
•  increased T2 signal on MRI

* grade II

•  moderate sprain
•  subluxation by less than 50 % of clavicular height on plain film
•  fluid outside joint capsule on MRI

* grade III

•  complete disruption
•  widening of joint, more than 50% subluxation on plain film
•  MRI usually not required                                                                                                                

Acromioclavicular joint Grade 3 disruption - “Acromioclavicular joint injury, grade 3 ”