Are you working with a physio or a rehab program? You need to get that knee strong before doing anything, which will require daily stretching and exercise.
I would personally wear a brace around the horses as a just in case until you have the knee strong. I would wait until you are able to run, squat and use the knee as normal before not using the brace at the barn.
If your doctor has not referred you to a physio, you should get a referral. You are an athlete, you need to treat your body as such. If your horse had a stifle injury, your vet would be there helping with rehab every step of the way. It's the same thing with your body, you need help and monitoring by a professional to get your knee strong without re injury.
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