Joined: Aug 2010
Posts: 12,748
Likes: 2,111
From: Madison, WI
Bikes: 1961 Ideor, 1966 Perfekt 3 Speed AB Hub, 1994 Bridgestone MB-6, 2006 Airnimal Joey, 2009 Thorn Sherpa, 2013 Thorn Nomad MkII, 2015 VO Pass Hunter, 2017 Lynskey Backroad, 2017 Raleigh Gran Prix, 1980s Bianchi Mixte on a trainer. Others are now gone.
Today while doing a long exercise ride, I thought of one more thing you might try. This is specific to your Achilles tendon, not the knee. I found that my foot was happier when I moved my cleats back about 10 mm from where the ball of my foot was. (I use shoes and pedals with SPD cleats, I do not know if you do or not.) This means that I am using the foot muscles less to push down on the ball of the foot than if my cleats were further forward. The downside is that I have more toe overlap with front wheel and fender.