How long has the patient had the pain? Are they a runner or consistant exerciser?
Have you or someone with knowledge of orthopaedics checked the knee?
The first half of the equation is definately treating the knee. The second half of the equation, is taking a look at the patients biomechanics, gait, and activities that may be contributing to the condition, and make corrections as needed.
When working with the knee, I like to clear the channels using the jing well points of the ST, SP, and UB meridians (bleeding tech), tupically on the first treatment, or if experiencing intense pain. After bleeding, I use Heding, Xiyan, K10, LR8, GB34, ST36, SP9, and SP10 (if blood stasis or night time pain exists). If necessary I also you kinesio or acu-taping, then schedule the next appt 3 days later, to remove tape and next treatment.
There are a variety of topical jows and plasters that can be utilized, as well as Evergreen herbs has a great formula for Knee and Ankle (Acute and Chroinc formulas).