Well done on the success trigger point work!
You will also need the patient to do some slow sustained stretching at home - like the stretches in the link here - in particular A and B.
Posterior Capsular Contracture of the Shoulder -- Bach and Goldberg 14 (5): 265 Figure A0008404FIG9 -- Journal of the American Academy of Orthopaedic Surgeons
Ask them to heat up the shoulder first - hotpack/warm shower, and do these stretches assisted with the other hand (like the pictures), or put a weight in the affected hand and use gravity to gradually increase the range of internal rotation (patient supine, shoulder elbow at 90), over a 15-20 minute period.
Remember once you gain new range you need to strengthen in that range.
if the trigger point treatment only worked a little then it isn't the answer, right?
are we talking about realfrozen shoulder or just someone who is really stiff? how long have they had the frozen shoulder? really, the research out there says you should mobilize and stretch the joint and surrounding tissue. maitland, kaltenborn, and others all offer really good mobilization techniques. true frozen shoulder often doesn't respond well to conservative treatment until it is at least 3 months old. then, treatment can slowly be made more aggressive. usually, full recover is expected unless the person is, for example, an uncontrolled diabetic. in fact, if they are a heavy smoker or drinker it may impact recovery too. and, if it is really chronic you have to consider that the AC, SC, and scapulothoracic areas may be involved. they may all need treatment. but, true
adhesive capsulitis just regardless needs lots of shoulder joint mobilization.