reason – eg past injury / operation or just general tightness – then it can't trigger the vastus medialis – which will therefore be 'wasted'. Test for this – sit on the floor – legs straight in front of you – reclining back slightly against a hard back
barbell. Oops.I became obsessed with what the human knee can and cannot do when one of mine shut down after a couple of days of modest runs over a nearby hill. The technical name for my injury was patellofemoral pain syndrome, otherwise known as PFPS
