Things don't look all that well for the Spaniard. Rafael Nadal, currently World no. 1, is obviously making a move to treat his knee injury. The injury is showing no signs of disappearing. Unless Nadal wants to keep on playing lawn tennis for a couple more years, he has to be serious in treating his knee.
The treatment isn't doing much good for his play, though. He lost in the fourth round of the French Open to Swedish Robin Soderling, and his position as the top male tennis player is in danger. Federer is slowly inching his way up again, not to mention other threats like Andy Murray and Andy Roddick.
from Mail Online:
Rafa's long battle with injury
2004: Out for two months with stress fracture of his left foot.
2005: Misses season-ending Masters Cup and Australian Open (January 2006) with strained ligaments in his left foot.
2007: Played less in latter part of the season to manage tendinitis in his knees.
2008: Out of Davis Cup final and Masters Cup with tendinitis.
2009: Misses AEGON Championships with tendinitis.