"There is a bimodal age distribution pattern of patients with hypermobile lateral meniscus. In children, the onset is in older preteens and teenagers. The majority of paediatric patients cannot recall a traumatic event and most cases are bilateral."
"The main symptoms are lateral knee pain and intermittent locking and catching of the joint. On physical examination, a provocative manoeuvre known as the Figure-4 test which places the affected knee in flexion, varus and external rotation may reproduce locking in patients with a hypermobile lateral meniscus 3."