As he pursues a third Wimbledon championship, Rafael Nadal's foot is being scrutinised.

Rafael Nadal returns to Wimbledon for the first time in three years . The Spaniard will be playing in the first major tournament since 2009 .

LONDON (Reuters) — Next week, when Wimbledon takes out the lush green carpet to welcome Rafael Nadal to the championships for the first time in three years, it will be the Spaniard's foot, rather than his formidable forehand, that will be scrutinized to the tiniest degree.Very few people had heard of radiofrequency ablation therapy until recently, a procedure that uses heat on the nerve to alleviate long-term pain.However, the 36-year-old was able to land at the All England Club with a unique technique earlier this month to treat a degenerative condition affecting the bones in his feet, and was able to attain the Grand Slam title number 23.Nadal had not won a major for 15 months before winning the Australian Open in January, had been out of action for five months due to his chronic foot pain, and had expressed regrets about giving up for good.