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The docs knew it was an UCL tear on the sidelines. The MRI/ultrasound isn’t needed to make that diagnosis. The MRI is done to rule out conditions you don’t know about, such as other ligament tears, fractures, or Stener lesions. Think of it as 6 weeks minimum and anything else other that UCL injury adds addition time. The 6 week timeline likely means Brees has a clean, isolated complete UCL tear.
If the docs could diagnose it on the sideline, it means they could see and/or feel evidence of a pretty bad tear. Surgery should not be delayed.