Hi Dobinson, Welcome to the forum. I so feel for you as the STS really can get you down and I had quite a few weeks of that. Do hope things will soon get started again and you will get some good results.
How are you getting on with your knee replacement? Are you having any discomfort or problems with it? Thought I would just let you know that there is a forum called "Bonesmart" which will answer any questions or worries you may have. I know the person who is admin to it and she is very knowledeable and caring.
first thing hope your ok after your knee operation.
second I also had a few sts weeks and i was so strict on plan and cried more than once in frustration and anger, people in group were going out eating a kebab and having 10 pints on a saturday and loosing 4lb in a week ( theres no justice ). I have had amazing support from my group friends and come through the other side and pleased to say my weight loss started again. DONT get dis hearted the weight will come off
Good luck any way with your journey