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Lions receiver Calvin Johnson underwent two surgeries this offsesaon. (Mike Mulholland | MLive.com)

DETROIT -- Calvin Johnson has undergone two surgeries since the end of the season 17 days ago.

The Detroit Lions receiver underwent a scope last week on his right knee, which had ailed him throughout much of the season, and also had work done on a finger in a separate procedure Monday.

Johnson's knee gave him fits throughout the year, dating all the way to training camp, and he was long expected to have the surgery. He missed two games and averaged only one practice per week for the season due to the condition.

The exact ailment was never disclosed, though Johnson has not refuted a report he was playing with a partially torn PCL. General manager Martin Mayhew side-stepped the issue Wednesday, saying only that Johnson had a minor scope.

Johnson's finger procedure is more surprising.

"He played the entire season where the finger was really pointing perpendicular from his body," Mayhew said Wednesday at Ford Field shortly after the introduction of Jim Caldwell as the team's new head coach.

"He's trying to catch the ball (awkwardly). He would never complain about that, but that was certainly a factor I think in the way he played."

Johnson racked up 1,492 receiving yards, fourth in the NFL, but was clearly limited late in the year and drops became an issue.

He dropped two big passes in a critical Monday night loss against Caldwell's Ravens in Week 15, and finished with eight for the season. Only seven players dropped more passes.

Johnson never mentioned that the finger was injured.