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Sternoclavicular (S/C) joint sprains

An S/C joint sprain is very similar to its related joint the A/C joint which is situated at the opposite end of the collarbone.

Severe S/C joint injuries will usually keep a player out of football for a few weeks, with minor varieties compatible with ongoing play. Scott Prince of the Gold Coast Titans suffered minor damage to his sternoclavicular joint against the Brisbane Broncos in 2007 but was able to play the following week.

Occasionally a sternoclavicular dislocation can occur where the clavicle moves inwards and threatens the organs inside the chest (such as the lung). This can be a long-term injury, as suffered by Ryan Girdler of the Penrith Panthers in early 2003.
Sternoclavicular Joint
Lithograph plate of the sternoclavicular joint
(Image sourced from Gray's Anatomy)