I am a Physiotherapist in North West London.
I agree with the comment about the meniscus, and I have seen this in a number of dancers, who thought it was a hamstring strain (or were told this by their GP), but it then turned out on examination to be a meniscal problem.
We can assess for either problem.
If it turns out to be a hamstring strain, then although different types of manual therapy or massage are very important, a structured program of rehabilitation exercises are essential for complete recovery, leaving no worry that it might be a problem again in the future.
We can provide sports massage, and structured exercises.
Many therapists are not trained to assess for joint hypermobility, which is very common, especially amongst dancers. If you have excessive joint flexibility, then your exercises need to be tailored in a different way, to minimise the risk of strain during your rehab, and minimise the risk of further injury after you have recovered.
Please let me know if I can answer any more questions: