I should start by saying I am no doctor, and do not claim to be.
I would say you negatively compounded an otherwise sore muscle with a pre-existing problem.
I have days where training makes my muscles extremely sore, and if I mixed that with a muscular imbalance I'm sure it could be bad/painful.
I expect you understand the concept of jumpers knee?
Most jumps only activate part of the lower quadriceps muscle. Doing this over and over can cause it to develop beyond the rest of the muscle, thus an imbalance.
Because of this imbalance many strength coaches have their basketball players do especially deep squats or full squats. This helps to stimulate the entire muscle and help the body regain some of its balance that it desires.
I would suggest you follow that lead. It should help you out long term, even if your weights numbers drop, that really doesn't matter. Full squats are one of the single most challenging things in the gym.
Just my thoughts...