Not hockey, but I tore the meniscus in my left knee playing Rugby. Nobody touched me, just changed direction too quickly and "pop" knee gone. Stood up, limped to the touchline, sprayed some deep heat around it and wrapped it up and carried on. Next morning, I couldn't put any weight on my leg. Saw a doctor and he thought it was an MCL sprain, rested it for 6 weeks as he said. Back to training and I could jog, but couldn't run, so went back to the doctor, another 3 months later, had an MRI scan and sure enough, a flap of cartilage in my knee (which would explain my knee locking at a certain angle!).
Another 3 months passed and had an arthroscopy and I could finally run again... The NHS is a blessing and a curse though. Cost me nothing apart from the National Insurance contributions I'd put in since I was 16, but they had no interest in getting me to see a physio. As long as I could walk in front of them, they didn't care, fortunately the club had a physic who helped.