The person confirmed the diagnosis to The Associated Press on condition of anonymity Monday because the Dolphins don't comment on injuries.
Hartline was hurt when he was tackled after a 25-yard reception in Sunday's season-ending loss to the Jets. The catch put him over the 1,000-yard mark for the second season in a row.
AP NFL website: www.pro32.ap.org and http://twitter.com/AP-NFL
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