Originally posted on Fox Sports  |  Last updated 12/21/11
A.J. Green Green has made quite the impact in his rookie season. Unfortunately, despite becoming the first rookie in five seasons to amass 1,000 receiving, his availability for Week 16 is in doubt. He suffered a Grade 3 acromioclavicular (AC) sprain in his right shoulder after getting tripped by a St. Louis defender. The AC joint serves as a strut for the shoulder at the location where the clavicle (collarbone) connects to a bony process on the shoulder blade known as the acromion. It allows for the arm to be raised overhead. The area is stabilized by two ligaments, the acromioclavicular (AC) and coracoclavicular (CC) ligaments, which are vulnerable to injury when the tip of the acromion is forced downward. AC injuries are graded on a different scale that most other sprains or strains. Instead of a three or four-point system, AC sprains are classified on six-point scale. A Grade 1 sprain is the least severe and involves overstretching and microtearing of the ligaments. A Grade 2...
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