The accomplishment of a treatment with Intratissue Percutaneous Electrolysis of additional form to the accomplishment of eccentric exercise's program in patients with chronic patellar tendinopathy is more effective than the accomplishment of an additional treatment with dry needling or eccentric exercise's program realized of isolated form.

Experimental study randomized with double blind, whose purpose is to compare three protocols in those who apply different protocols of physical therapy to themselves in three groups of intervention with patients with chronic patellar tendinopathy.

There take part in this study young women of both sexes, of Zaragoza and of different sports clubs of entity 18 and 40 years, that they realize of habitual form (minimum 3 times a week) a sport. All of them present chronic patellar tendinopathy.

Inclusion Criteria:

• Age understood between 18 and 40 years.
• To practise any sport of habitual form.
• Patients diagnosed of chronic patellar tendinopathy with a minimum of 3 months of evolution and with stable symptomatology.
• Pain to the palpation of the tendon in the low pole of the knee and during the training or competition.
• Punctuation of the questionnaire VISA-P under 80.

Exclusion Criteria:

• Patient had an operation on the knee affected in the last 6 months.
• Infiltrations in the knee affected in the last 3 months.
• Patient who has received pharmacological treatment or physical therapy in the last 48 hours.
• Pathology with less than 3 months of evolution.
• To present bilateral chronic tendinopathy.
• Punctuation of the questionnaire major or equal Visa - p of 80.
• Inability to apply someone of the techniques of treatment or valuation for absolute or relative contraindication.