Yes! Three months is only 25% into your one year recovery
@annamb2
Stiffness especially after standing, sitting, sleeping is totally normal at three months. It will slowly resolve.
It's not at all unusual for our members to still have problems going stairs at 3 months.
First, your tendons and ligaments are just barely healed at 12 weeks, so they aren't fully providing the level of support to muscles and overall structure that they will soon enough.
Second... going downstairs is a remarkably complex anatomical and physiological feat!
It takes a certain amount of strength, flexion, and extension. Sometimes the flexion or extension we have developed for walking or sitting is still hampered a bit when we have to also flex or extend our hips (getting into car, or going down the stairs)
For each of several large muscles, there needs to be coordinated, efficient firing of nerve cells to each small bundle of fibers within the muscle - and that takes a while of healing, then them practicing to make it happen.
At the same time, as we shift our weight from one step to the next the body's proprioceptive system (that tells us where we are in space) has to be functioning well in coordination with those nerves and muscles.
Just as when we were very young and had to put all this together to learn going down stairs, when our bodies have repaired enough, the skill will return.