Last night my GirlChild (granddaughter, 19), whom we have raised, severely hyperextended her right knee at work and fell screaming to the floor. She works at a Japanese restaurant. They called an ambulance and sent her to the hospital where we met her. They found no damage on xray, put her in an immobilizer, gave her pain meds and sent her home.
She will probably need more diagnostic imaging and may (probably) need to see an orthopedic surgeon. We won't know for a while if she will need arthroscopic surgery. Thank God she has Medicaid.