Leg Injury Needed: Apply Within

I'm fed up with my own ideas for how to abuse my MC. I've finally caved and come to beg help from experts.

My character is male, nearly eighteen, moderately physically active, and prone to getting himself into comedic, awkward, usually painful situations. In this case, he's in a remote area of China in the summer/spring, alone. He's a treasure hunter of sorts and hours before lost the thing he was looking for to his dastardly foes. Now he's on his way home to sulk and come up with a new action plan. I need him to get a leg injury that will take at least two months healing and doesn't require major surgery. He's in the middle of the jungle and going to be found by a very poor family. I'd rather not have to give him gangrene and chop his leg off.

I also need this injury to leave him disabled, enough that he'll have difficulty moving over uneven terrain, sometimes wear a leg brace or use a cane for added support and have a limp. The manner of delivery for this injury is the trouble, as I'm not sure what kind of injury will give me the results I'm looking for. The hip is off limits, but anything else is fair game. I've contemplated everything from throwing him over a waterfall, bear attack, snake bite, elephant attack, moose attack (it was going to happen in Alaska at one point, and may still, so keep an open mind), parachute failure, to tripping over a rock. I don't care if it's an animal attack or a fall or any other means-he's quite good at aggravating everyone around him and is an utter coward, so if confronted he's likely to run away or try to hide.

Side note: He uses a personal transportation system that resembles a miniature helicopter and is worn as a backpack. Feel free to break it.

Plantar Fasciitis I am familiar with, but that is usually caused by constant movement or position that is new or repeated and stressful for the tendon. I need a sudden, crippling injury. The back problems would actually be almost ideal, but they won't force his traveling companions to leave him in the jungle for a period of time (a week to two months) when they find him, and it'll give me plotholes later. Most of the scenarios I've been throwing around involve breaking of the leg, foot, or knee. I've been using the idea of breaking a bone since I'm much more knowledgeable with such injuries and their treatment. Is anyone familiar with nerve damage to the leg? How, where, and why?

I think I forgot to mention earlier, but the limp has to be permanent.

I think an unknown spiral fracture, a few contusions, combined with first responders with second-grade education and third-world home remedies ought to do it. Give him a spiral fracture on one side that he doesn't know about and an intramuscular contusion, which he's familiar with, and make him walk on it. That will damage the bone sufficiently to require first-world medical care to fix. Have it misdiagnosed by the people who find him, and boom! Permanent limp that takes far too much surgery for too little improvement to bother. I might add in something else, just because I'm mean and he's easy to abuse.

Thank you all for your advice! It was very helpful, and kept me from giving in to my frustrations and feeding him to a bear.

The impact injury you all led me to isn't working out well. I'm feeding him to a bear. After I drop him thirty feet to land on his leg, anyway. Whatever the fall doesn't do, the bear will and he'll still end up with the level of injury needed. I'm a little mean, aren't I? If only he weren't so easy to abuse...