Mr B – an elite Australian Rules Football player presents withpatella-femoral pain on the left side. It is aggravated by runningand kicking as well as when he does squats as part of his gymprogram. Outline the biarticular muscles and structures you couldassess that may play a role in the cause of his knee pain, statingthe muscle length tests you would perform for these muscles anddetailing the combination of hip and knee movements that wouldresult in an effective length test and stretching program forhim.