CAGED HEAT (1974) - This is a crazy prison film produced by Roger Corman and directed by Johnathan Demme. It's a women in prison film with Barbara Steele as the handicap warden. You really get to disliked what is happenning to these women especially with that sick sick doctor. This film is crazy and harsh with a dash of Corman production humor.
(http://www.buio-omega.de/GRAPHICS/NEWS/2002/07-09/DVD-CagedHeat.jpg)
Ever seen 'Savage Island'? Basically an Italian(?) made women on a prison island movie re-edited with opening and closing sequences with Linda Blair added. Cannot recall the original title of the unedited version.
Read some reviews after reading your post. Haven't seen it around, but will put it on my list. It's an Italian production. Thanks.
Found out that 'Savage Island' was edited from the movie 'Escape From Hell' which is available on DVD for $10 or less.