According to a report from Derrick Gunn of CSN Philly, Philadelphia Eagles safety Earl Wolff underwent successful surgery on his knee injury.

Safety Earl Wolff finally had surgery on his knee yesterday. — Derrick Gunn (@TheRealDGunnCSN) November 21, 2014

Wolff had his right knee scoped to repair a micro fracture... Will not be back to full speed until next May. — Derrick Gunn (@TheRealDGunnCSN) November 21, 2014

The Eagles placed Wolff on the season-ending injured reserve list earlier in the week. In a corresponding move, the team signed defensive back Roc Carmichael.

Wolff's injury situation is a little perplexing. Wolff was healthy enough to start in place of an injured Nate Allen during Week 9 and hadn't recently been listed on the team's injury report prior to his deactivation. It appears Wolff was healthy enough to play through injury. His effectiveness on the field may have been limited, however. Wolff failed to impress while playing both defense and special teams. The team signed Chris Prosinski in early November to fill Wolff's special teams role.

With Wolff not expected to be fully healthy until May, he may miss some of the team's offseason workout schedule beginning in late April. Wolff certainly hasn't done much to inspire confidence through his first two seasons with Philadelphia so it will be important for him to get healthy and impress the coaching staff in the offseason.