Cristiano Ronaldo was once diagnosed with a knee injury that has 'no guaranteed cure' and gets worse over time without an extended rest period.Ronaldo is gearing up for his second Manchester United debut against Newcastle on Saturday after securing an emotional return to the club this summer.Despite being 36 years of age, the Portugal captain remains at the top of his game and, as ever, in superb physical condition, meaning he is expected to set the Premier League alight once again.However, that's not to say he hasn't suffered his fair share of injury problems over the years...Ahead of his United homecoming, Twitter user @LLF_14 has produced a fascinating thread which claims Ronaldo has been playing with a knee condition called 'tendinosis'.
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