Max Biaggi has revealed he was racing with torn tendons in his shoulder when he claimed a podium on his World Superbike Championship return at Sepang last month.

The 2010 and 2012 champion made two wild-card appearances with the Aprilia team at Misano and Sepang earlier this season, marking the first time he has raced competitively since his retirement at the end of his successful 2012 campaign.

Culminating in a run to a popular podium finish in Malaysia, at the time Biaggi revealed he was competing in considerable discomfort after a fall in a pre-event test left him nursing a shoulder injury.

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The Italian has since revealed the extent of that injury, saying he went on to be diagnosed with a torn tendon in the shoulder. Despite this, he was able to avoid surgery and this week returned to riding as part of a one-day test at Misano with Aprilia.

"After Sepang I underwent more extensive checks and it became clear that a tendon was torn which happens when a shoulder is dislocated," he said. "I did not undergo surgery, but I did all the physiotherapy and exercise I could in order to reinforce the muscles in my shoulder area."

"My participation in the race in Malaysia was already in doubt, as I felt the pain was way too strong to be a minor injury but we did it anyway!"

Biaggi is not scheduled to compete in any of the final three rounds of the 2015 World Superbike season.