An hour (15mins gratis) with the chiropractor (S) and a thorough work out, lower neck, mid-back & SI. Hoping the leg weakness of late improves as a result- just a hunch. Got to the stage I need to go regularly before things lock up every few weeks. Think knee strength might be fixed by no more than unweighted squats etc.
Body conditioning 10:00 
Simple two and single legged squats and balance exercises for lower quads and knee support muscles.