hope he feels better soon! I know to some it sounds odd but it really isn't. I had this happen to my daughter just befroe she turned 2. She was walking down the stairs... on the last step she didnt think there was a step so it surprised her when she went down far.. if you KWIM.. anyways the impact of misjudging the step hurt her. It was nothing major... i didnt even think she was hurt. but then she wouldn walk... then i got freaked out.. many xrays later and a trip to the orthopedic specialist and nothing ever showed. The specialist told us that sometimes kids do that... somethign scares them (pain) and it takes them awhile to get back at it.. we let it go for a week.. she crawled around on her second birthday party!! then i started tricking her... i remember my mom was leaving and i told her to come wave.. she was so excited she forgot about her leg.. pulled herself up to the window sill.. i didnt say anything.. then i quietly mentioned look your standing you can do it!!! then she realized she could walk and it was ok and that was it!! DRAMA!!! LOL i regret all the xrays but what are you going to do... it scares you. kidscan be like that! it was almost exactly 2 weeks before she walked!!! now that she is 7 i understand since she is my little drama queen