Since I've had several injection/dry needling treatments, I'll jump in here in response to Webslave and Treynor. When the doctor uses lidocaine to help with soreness, it's usually referred to as an injection; when they don't use any anesthetic, they use a smaller, acupuncture type needle and then it's called "dry needling". the same purpose occurs, that is, disruption of the trigger point through the use of the needle head, i.e., the breaking apart of the tissue so it can heal in its longer state and properly be able to let blood in and wastes out.
HOWEVER, THIS IS NOT A SHORT CUT OR CURE-ALL FOR PELVIC PAIN. Often times it is more effective than pt/massage because it's so direct and invasive. but if you don't address contributing factors also - stress, postural/misalignment problems, or anything else that is resulting in repetivie muscle abuse or holding - the pain/trigger points will come back.
Also, there's no way really to inject the anterior portion of the pelvic floor. you can only inject the posterior area, i.e., the part you can get to through the butt cheecks close to your crack. i've never heard of someone intra-rectally injecting the anterior portion of the pelvic floor, i.e., the first diagram in
AHIP 3rd edition.
Furthermore, I have found that post-injection bath, stretching, and massage itself is necessary to gain true results from the injection. often I go straight from the doctor to the myotherapist.
i resorted to injections because my glutes were so knotted up due to pelvic misalignment, that massage just wasn't cutting it. but massage has been necessary to maintain the improvement I got with the injections (tennis balls at home too).
Finally, I would only go to someone with experience with this stuff. you don't want someone needling your abdominals and just happen to go too deep.
If people bought clair davies' book and/or Dr. Travell's Medical texts, you could answer a lot of your own questions about this stuff.