Tennis and gymnastics have been shown to have the highest likelihood of an isolated LCL injury.  The LCL can be sprained (grade I), partially ruptured (grade II) or completely ruptured (grade III) . 
Lateral Knee Ligament Sprain (LCL) May 13, 2021. A lateral ligament sprain is a knee injury involving a tear to the ligament on the outside of the knee. It most commonly occurs following a direct blow to the inside of the knee. However, it can develop gradually through overuse.
tennis. A 2020 study notes that isolated collateral ligament injuries are rare. Due to complexity of the knee, injuries are more likely to involve other structures in the knee. It also notes that...
Lateral collateral ligament (LCL) knee injuries are typically diagnosed by a sports medicine physician or other health care professional. A person should be prepared to answer questions, undergo a physical exam, and have medical imaging (such as an x-ray) performed. Patient Interview
Injury. Injuries to the LCL and posterior lateral corner result from a rotational force across the knee often with buckling of the knee. A contact injury, such as a direct blow to the medial side (inside of knee), or a noncontact injury, such as a hyperextension stress.
An LCL injury (a torn LCL or a LCL tear) is a strain or tear to the lateral collateral ligament (LCL). The LCL is a band of tissue that runs along the outer side of your knee .
Lateral Collateral Ligament injury is often associated with trauma and forceful motion into varus. These injuries are commonly associated with a fracture or subluxation at the elbow joint. An Ulnar Collateral Ligament tear or sprain could occur with valgus overload or stress movement from pitching or throwing. Typically seen in younger male pitchers, a UCL tear or sprain could also be found in athletes involved in repetitive overhead activities like tennis or volleyball.
LCL sprain taping helps protect the lateral ligament following a lateral knee ligament sprain. It can be used during treatment and rehabilitation phase, but also when returning to normal training.
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