I would bet...
Sounds like either a partial (bucket-handle) tear to the meniscus or possibly a more significant tear of the meniscus...
The catching and popping is what makes me think it could be the meniscus...The meniscus basically looks like a donut if you were able to look directly down on it from top of your body...A ring structure of cartilage, acting as a cushion, basically...
What can happen is the loose chunk of the meniscus floats around in the articulation until it gets caught up, almost like a stick stuck into the hinged side of a closing door...It will catch and lock the knee until you pop it out...
But, either way, I would at least go in and have them check it out...You aren't under any obligation to have anything done, but IMO it's always best to find out exactly what the hell is ailing ya...
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