Hi Mrs Wahl, and welcome to the forum. I somehow don't think its the broken leg that caused your PTSD as a police officer, and I say that because of what your mentioning about being afraid someone you arrested might be waiting for payback or the like, and more so that the broken leg is the catalyst that has possibly thrown you over the edge to now realise what you know, though may not quite believe yet, in that you are not the same person anymore, and no you cannot look after your family the "exact" same way as you used too before this incident.

You are suffering a medical stuffup, which has catalyst your existing trauma into reality for you, being that before this you most likely where at the ready constantly when walking into your home, ready if a prior arrestee was awaiting you or a family member, now you realise you can't defend yourself as you once used too, however; your condition does not mean you cannot defend yourself overall though. Panic alarms, sprays, taser, etc, all personal protection if you believe you require them. Yes, you have to come to terms that you can no longer physically defend yourself, but not everyone can, hence why protective measures where designed in the first place.

Some of what your mentioning is purely reality, one of which your trying to compare against your past. You are no longer that same person, and that is something you must come to terms with. This is no different from a person who loses the loss of their legs, where they will sit in denial and blame the world, or themselves, sympathy and so forth because they cannot do what they used too, but the reality is, you will never be able to again, so start working towards what you can do logically now for your capabilities, and stop comparing yourself to your past.