I was using the same, 40 grams whey protein with L-Glutamine, post workout. Mixed with OJ to provide some sugar to help recovery.
With the arthritic ankle though, I've been reading up on the anti-inflammatory diet, and foods that cause inflammation. Casein apparently causes inflammation and is a component of whey protein, so starting a week ago I've laid off for a while, and just eat some protein post workout like a can of sardines or a few boiled eggs.
Not sure if it's helping yet.
PS, it's sunny here so I'll be taking a hike with the pack, first day it hasn't rained in a while.
