Serious recreational athletes are often advised to stop sporting activities (e.g. jogging, fultsal and badminton) without diagnosing the condition of their knee pain. A proportion of these people do not remember even having a fall or injury while playing sports but have eventually started having knee pain lasting from weeks to months.
Many of such patients would benefit from a visit to their Sports Physician or Orthopaedic doctors for a detailed examination. Even elderly folks have returned to an active lifestyle when they started doing regular simple rehabilitation exercises. Within weeks to months, some recreational athletes would be able to return to sports if they do not require surgery.
Read up more on knee injuries here.