Ultrasound Probe Pressure on the Intratendon Doppler Signal in Patellar Tendinopathy

Ultrasonic exploration by power-Doppler of the intratratendon vascularization, making longitudinal cuts of the patellar tendon and with previously pre-established Doppler optimization parameters for all patients. The optimization parameters of the power-Doppler signal will be set at a Doppler frequency of 6.7 MHz, pulse repetition frequency (PRF) of 0.7 kHz. The lowest wall filter and a standardized gain just below the level that produces random noise will be applied. This examination will be repeated several times with different probe pressures, which will be quantitatively adjusted through the force sensor and maintained with the articulated arm. A 4-second static video will be recorded of the longitudinal section that presents a higher Doppler signal in each of the scans at different probe pressures.