Cohort Study of PPP Injections for Athletes With Muscle Injury

Inclusion Criteria: * Age between 18 and 45 years * Diagnosis of a muscle strain in the lower extremities, including but not limited to hamstring, quadriceps, and gastrocnemius * Injury occurred within 10 days of the initial clinical evaluation * Injury occurred while engaging in athletic or sporting activities * Participants must be willing to undergo prescribed physical therapy * Participants have agreed to standard-of-care management for their injury, which may include ultrasound-guided aspiration with or without a platelet-poor plasma injection Exclusion Criteria: * Previous injection at the injury site. * Pregnant or breastfeeding women, or women who may become pregnant during the study duration * Injuries resulting from puncture or crush trauma * Injuries occurring more than 10 days prior to the injection date * Injuries not caused by athletic or sporting activity * Previous muscle injury in the same muscle group within 6 months