Sometimes, athletes injure two or more ligaments at the same time, this is referred to as a combined or multi-knee ligament injury and can be very serious.
MCL Injury Rehab & Exercises (Medial Collateral Ligament Sprain
After ACL Reconstruction: Complication and post-surgery treatment
The Do's and Don'ts After ACL & MCL Tears & Surgery
Common Knee Injuries - OrthoInfo - AAOS
Medial Collateral Ligament (MCL) Injuries (for Teens)
Knee Ligament Repair Saint Luke's Health System
ACL injury - Symptoms and causes - Mayo Clinic
LCL Injury - Motus Physical Therapy
Posterior Cruciate Ligament Injury
Knee ligament injuries