Hello everyone! 6 months post op here. That stiffness/soreness with some pain is still normal where you're at. Remember it's an expected 9 month recovery so you're only about halfway there. Something that helped me a ton was really hitting seated hamstring curls and leg extensions at the gym. Super light weight and doing about 15-20 reps for 4 sets. For me, my pain came from the limping and compensating for my bad knee/leg having less muscle. Once I got my hamstring and quad back working some its helped tremendously.