Re: Torn Medial Meniscus
As a Physical Therapist of over 20 years experience I totally agree with Janet. I also suffered a torn medial meniscus in Aikido.
Keep the thigh muscle strong through non weight-bearing exercises such as cycling or swimming.
DO NOT hyperflex or rotate the knee so no Seiza or Shikko.
Consult an orthopaedic surgeon as it may need to be removed (mine had to be)
Take time for it to heal. At your age tissue is still growing BUT cartilage takes 3 - 6 MONTHS to heal.
Finally be patient.