British MotoGP star Cal Crutchlow is to undergo shoulder surgery this winter, when he will also move from Ducati to LCR Honda.

Crutchlow has struggled with arthritis in his shoulder for several years and is planning to have the joint improved at the same time as a metal plate is removed from his left collarbone.

"I have to have an operation for sure," said Crutchlow, speaking in the Ducati hospitality on Friday evening at Misano. "I'll have it immediately after the last race because I need to take the plate out of the collarbone. It's not a big issue.

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"Taking the metalwork out of the collarbone is probably good because in the colder conditions I get the problem with arthritis, but also pain from the metal. It's better to have it out and I don't want to leave [the plate] in too long because then it really gets stuck to the bone.

"So I need to get it out to be honest and hopefully they can clear the arthritis up a little bit [at the same time] and see if that's better. It's not a major operation and I should be back on a motorbike within four weeks. So at least I can do something during the winter."

Following the operation, Crutchlow will have until the opening official pre-season test of 2015 at Sepang in February to regain fitness.

The Englishman was speaking after finishing a wet Friday practice at the San Marino Grand Prix in eleventh place.

"The conditions today were obviously not the best," he said. "It was the same situation for everybody. The track surface was really slippery. I was disappointed to have a crash this morning, but Ducati did a great job to get the bike rebuilt and I could continue with the session.

"Bridgestone said there was no problem with the hard front tyre, then when everybody crashed we got the soft for the afternoon - and everyone crashed again! So I don't think it was a problem with the tyre. I think it was more the guys pushing to the limit on the track surface and conditions at the time."

Friday saw a Ducati at the top of the timesheets in both sessions, with Pramac's Yonny Hernandez quickest in FP1 and Crutchlow's team-mate Andrea Dovizioso heading FP2.

"I believe out of the Ducatis, Hernandez is the true winner because he never crashed and the rest of us did! Seriously I think it shows the potential of the bike in the rain and around Misano, because Dovi did a great lap time. A lot faster than anybody else.

"We had a small setting issue with the electronics in the afternoon and we were unable to improve once we were out on track. I didn't have time to come back in. So disappointed with the lap time because we could have gone a lot quicker I believe."