Oh goodness, FraidyCat, I am so sorry. How frightening it must of felt to lose your grip and feel yourself tumbling.
Thankfully you didn't fall further and do more damage. I'm glad you reached out here. It's understandable that the foot fracture feels like a huge setback. Feeling despair or anxiety is normal, but please know this will not ruin your recovery. Your knee has already gone through months of healing and strengthening. You won't lose that foundation. It is important to protect your foot right now, and its only temporary. Once the fracture heals you can resume rehabbing your knee safely, and likely with minimal work only you'll be back on track. You can keep your knee mobile with quad sets, or straight leg raises or other seated exercises, if it will make you feel as though you're still proactive in your TKR recovery. View this as a "pause" that's all. I'm also sorry you were disappointed by the physician you dealt with. You deserved kindness, patience and encouragement at a time when you were hurting physically and emotionally. Please lean on us when you feel the need, we are here for support always and we do care.

Wishing you a peaceful Sunday.
@FraidyCat