I am not a Dr. but, unfortunately I have similar symptoms on my Left leg from a L5-S1 posterolateral disc herniation and sequestration over 6 mths ago (31 yr old, active Male, w a fragment that has been absorbed but pain remains).
Did you already get an MRI, or book a Neuro-surgeon or Orthopaedic Surgeon? With any disc bulge or surrounding nerve damage
(DDD) casuing narrowing or impingement on the S1 nerve root
, pain travels down the root to your knee/leg/foot/toes (that's where 90% of my random, sharp pain
is- back of my knee anyways). My experiential 2 cents is that the actual area of contact/damage is in your back...not accupuncture on your knee. The specialists can identify from your MRI to help your treatment plan.
Trust your physio/ Chiro and medical team. Core strengthening, decompression or other surgical/non-surgical treatment
may help to relieve your radicular pain
best of luck on a full and prompt recovery.