So on top of
breaking his leg, it turns out KG also completely tore his ACL and is going to need reconstructive surgery that will take 4-6 months to fully recover from.

His new ACL may come from a cadaver. Eeek.
The first thing I did when I heard this was look up
"How To Get Rid of Ghosts..."(After all, the last place you want a ghost is on the INSIDE of your KNEE.)
Here are some really useful suggestions I found:
How To Get Rid of Ghosts:The simplest solution is usually most reliable: Speak to the ghost, out loud. Shout, if you feel you must. Explain to your ghost that he/she is doing things that bother you. Explain exactly what those things are. Ask the ghost to stop immediately. If you want the ghost to leave altogether, you need to say that.
This usually works. However, some ghosts won't take you seriously, and you may need to remind it to leave you alone several times before it stays away.
Holy Water is another tried-and-true remedy for ghosts.Respectfully and quietly enter your nearest Catholic Church, carrying a small jar or bottle from home. Somewhere in the public area, there will be a large container of Holy Water, usually stainless steel with a cross and a spigot on it.
Fill your container with Holy Water. It's nice to leave a small donation for this, too. (A dollar or two is customary.)
Make a broad Sign of the Cross at the site of the wound, allowing the water to fly off your fingers as you gesture. (If you don't know how to make a Sign of the Cross, ask any Catholic.)
It can be helpful to add an out-loud prayer, such as "I bless this [knee] in the name of God," or, "I banish all evil spirits from this [knee], in the name of the Sweet Baby Jesus," or something like that.
(If you feel silly saying this, and can't help laughing as you do it, don't do it. This is not a light or casual ritual.)
Prayer and religionYour ancestors, deities, and saints are in the spirit world, as your ghost is. It's logical to ask the help of these friendly spirits.
If you have a shrine--formal or informal (such as a display of photos)--to your ancestors, have a chat with your favorite deceased ancestor. Explain the situation to him/her, and ask for help.
If you're very upset about your ghost, we recommend the Irish saint, St. Dymphna, who is the patron saint of mental health. She's great for calming situations. We save St. Jude for extreme situations when all else has failed. He's busy enough with others' urgent requests.
Pagans may want to use a banishing ritual, unless the idea bothers you, obviously.
GarlicDon't laugh! Garlic is a tried-and-true repellant for unpleasant spirits of all kinds. Minced garlic is easily spreadable. Rub it on the site where you need protection. A clove in your pocket is a good idea, too.
If you believe in folk magic, you can create a small pouch with several protection herbs in it, including five-finger grass, cinnamon, and echinacea. However, don't overdo this. The point is to repel ghosts, not drive everyone else away from you! *grin*
The shoe remedyThis one sounds silly but gets great results: When you go to bed at night, set out the shoes you'll wear in the morning. Place them at the foot of your bed, on the floor, with one shoe pointing one way, and the other shoe pointing the opposite way.
According to folklore, the ghosts get so confused by this, they leave after a few nights.
(If you like this one, scroll down to see the sand remedy.)
Incense and space clearing (mostly for clearing haunted houses)Light the incense and carry it around, making certain that you get the smoke everywhere, particularly inside closets, room corners (use a sturdy chair or ladder for uppermost corners), attics, basements, and so on.
Or, you can ring a bell in every corner, and in every room. Or clap your hands.
The whole idea is to get the air moving in stale corners where ghosts may be hiding.
If you can't do anything else, vacuum!
Sand, rice, split peas, etc.Randomly toss rice, split peas, sand, salt (but not sugar as it leaves a sticky residue), coffee beans or grounds, or anything small and granular, on your bedroom floor when you go to bed at night (if that's when the ghost is most bothersome).
According to folklore, the ghosts will pause to count the grains of whatever-it-is. They aren't very good at counting, so they have to start over again, repeatedly, or they forget the numbers.
Clean up the mess in the morning, and do the same routine again at night.
After a few nights of this, the ghost should throw its hands up in frustration, give up, and leave.
............................
Hope that's helpful!
Hang in there KG!
Guys, keep sending him words of encouragements.