The study consists of 3 phases (Identification of eligible patients, follow-up by telephone or telemedicine platform and the collection of study-specific clinical data of enrolled patients): * Identification by trained medical personnel of subjects who meet the study inclusion criteria. * Once the patient's Informed Consent has been obtained, the study-specific questionnaires will be submitted. * Clinical score data will be collected from the questionnaires conducted at mid- and long-term follow-up of patients enrolled in the study. The data collected during the long-term follow-up will be used to evaluate the time course of the results obtained after treatment of osteochondral lesions of the patellar cartilage by spinal cord stimulation with microfractures
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International Knee Documentation Committee
Timeframe: baseline (post surgery)
Knee Injury and Osteoarthritis Outcome Score
Timeframe: baseline (post surgery)
EuroQol visual analogue scale
Timeframe: baseline (post surgery)
Tegner Score
Timeframe: baseline (post surgery)
(EuroQoL) Current Health Assessment
Timeframe: baseline (post surgery)
Patient Acceptable Symptom State
Timeframe: baseline (post surgery)
Final assessment of treatment
Timeframe: baseline (post surgery)
failure question
Timeframe: baseline (post surgery)