needle treatment for calf trigger points ?

Sounds like you have an educated doctor.  One who actually knows what he's doing. 

As you've learned, trigger points are little knots in the muscles.  Mini-spasms, actually.  Mere stretching doesnt get rid of them.  You have to disrupt the spasm before you can stretch it out and retrain the muscle to behave more normally.   Probably the most effective way to disrupt the spasm is by needling it.  This isn't often done because its obviously intrusive and there aren't a large number of people qualified to stick needles into very specific body parts.  It takes a lot of training and knowledge to be able to place it exactly in the knot to disrupt it.

Other treatments that can help disrupt the TP is hands on massage.  Physically working out the knot.  This is the most common treatment form and can be done on yourself.  Another treatment means is ultrasound. 

Trigger point therapy is not mainstream treatment.  Its not taught in med school.  You normally have to go to "alternative" medicine practitioners like massage therapists, physical therapists, chiropractors, accupuncturists, etc. to receive these types of therapies.   Its somewhat ironic; there are no doctor specialties for muscles.  The primary body part used in movement doesnt have a specialty. 

If you're looking for more information, take a look at Travell and Simons' Myofascial Trigger Point works.  Also, Clair Davies has some less expensive, less technical books that might be more hands on.

Your doctor is not cooking up things from Thailand.  He seems very progressive and the type of doctor that wants to find things that work, not what's popular.  Wish I had a doctor like that.

I'm not commenting on accupuncture in and of itself.  Only the needling treatment option for trigger point therapy.  And you can get that from Travell and Simons.