Can I take hydrocodone if I have knee surgery scheduled in the morning? I have PCL surgery scheduled in the morning but want to know if I can take some hydrocodone tonight to ease the pain.

Yes, but tell them. You can take pain medications, but tell the anesthesiologist and the pre-operative nurse exactly what you took and when you took it. Use only a sip of water to swallow them.
By . By the date of this post a week and your surgery has passed. I hope all went well. In a case such as this if you are not sure of what you can or can not do before surgery and you are concerned you can always call your doctor's office. Even if it is after hours there is an on call doctor that will be able to answer your questions.