Muscle injuries are frequent traumatic events in daily life, particularly during sports. In sports, their incidence varies from 10% to 55% of total injuries. According to the Mueller Wohlfart classification, muscle injuries are classified into direct traumatic injuries (contusion-laceration) and indirect traumatic injuries, which are further divided into non-structural injuries (grade I and II) and structural injuries. Structural lesions are further divided into partial muscle lesions (grade III): 3 A, minor partial lesion, i.e. lesion of one or more primary bundles with a secondary bundle; 3 B, moderate partial lesion, i.e. lesion of at least one secondary bundle and with a rupture area \< 50% of the muscle surface; and (sub)total muscle injury (grade IV).
presence of a grade III A muscle lesion of the lower limbs, according to the Mueller-Wohlfart classification, confirmed by ultrasound examination and occurred during sporting activity at least 5 days before inclusion in the study;
no previous muscle injury in the last 6 months;
signing of the written informed consent for participation in the study.
previous muscle injuries or bone fractures of the lower limbs in the last 6 months;
knee instability due to previous rupture of the knee ligaments;
active neoplastic or infectious diseases;
contraindications to biostimulation;
Parallel
High Energy Laser Group
DeviceThe multimodal high energy laser therapy treatment with thermal control (THEAL) will be delivered with an Ixyon XP device (Mectronic, Bergamo, Italy) which allows the delivery of 4 wavelengths (650 nm, 810 nm, 980 nm and 1064 nm), with continuous and pulsed mode, average power up to 30 W, administering 10 sessions every other day. The patients will simultaneously carry out the rehabilitation treatment exercises, as was expected in the control group.
Exercise
Other interventionDaily exercise
recovery of pain
The visual analog scale (VAS) is a validated, subjective measure for acute and chronic pain. Scores are recorded by making a handwritten mark on a 10-cm line that represents a continuum between "no pain" and "worst pain."
Size of the lesion
ultrasound evaluation of the size of the muscle lesion
Frequency of relapses
Onset of new muscle injury
Return to sport activity
Number of days to return to play
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