A 20- year old Caucasian female soccer athlete presents with right knee pain which occurred during a soccer match. She reports planting to kick, then striking the ball simultaneously, but opposite of her opponent. Striking the ball at the same time, the patient felt a sharp, immediate pain in her right knee, heard an audible ‘pop’, and ‘dropped’ to the ground.

She was evaluated on the field by the trainer, who determined her ligamentous structures of the knee to be intact. She developed a mild effusion in between the initial injury and being brought to the trainer’s table on the sideline. She was unable to bear weight on the leg and had pain even to toe-touch. She reported no numbness or tingling radiating into the extremity nor around the site of injury.

The patient was placed in a knee immobilizer and given crutches with instructions not to weight bear. She was scheduled for a work-up the following day in the training room.