You're the flight surgeon. Osteochondritis dissecans.
Hughes
Duncan G
DG
USAF School of Aerospace Medicine, USA.
D000328:Adult; D000401:Aircraft; D000413:Alaska; D018771:Arthralgia / Q000175:diagnosis* / Q000473:pathology; D006801:Humans; D007717:Knee / Q000473:pathology*; D007718:Knee Injuries / Q000175:diagnosis* / Q000473:pathology; D008279:Magnetic Resonance Imaging; D008297:Male; D008889:Military Personnel; D016272:Occupational Health; D010008:Osteochondritis Dissecans / Q000175:diagnosis* / Q000601:surgery; D016059:Range of Motion, Articular; D014481:United States