concussion: "An injury to the brain that results in temporary loss of normal brain function. It usually is caused by a blow to the head." It can result in dizziness, memory loss, or loss of consciousness. http://www.aans.org/Patients/Neurosurgical-Conditions-and-Treatments/Concussion
shoulder subluxation: "The humeral head slips out of the glenoid cavity as a result of weakness in the rotator cuff or a blow to the shoulder area." https://www.physio-pedia.com/Shoulder_subluxation
ACL tear: "About 70% of ACL injuries are non-contact injuries that involve sudden deceleration, such as cutting, pivoting or landing on one leg. ACL injuries from contact typically occur from a direct blow to the knee when it is hyper-extended or bent slightly inward (valgum). " https://www.sports-health.com/sports-injuries/knee-injuries/acl-injury-causes-and-risk-factors
ankle sprain: when the ligaments of the ankle are stretched beyond their limits and damaged, causing instability.
bone fracture: a break in the bone as a result of impact or stress.
