name of movie with killer lizzard like arm?

[Joker13]

Ok i posted lastnight or thought i did but i cant find it any where. the movie im im looking for the title of wasmade between 1985-1995 it is a horror scifi kinda of movie.

A young scientist is working on limb regeneration and his mom/step-mom has killed his dad or smething and they argue and he leaves the house. he ends up losing an arm and he regenerates himself a new one but its alive and acts on its own and can kill. i think it has a mouth or something. he takes up refuge with some people in the sewers and falls in love with this girl there. he later corrects is mistake and makes a regular arm but i think he removes it and makes a new killer arm to save his girl well the mom/step-mom ends up in the girls body and she plans on placing her lover in the young scientists body? does that sound like a movie you have seen please help me.

[hellbilly]

Sounds like Severed Ties (1992) to me: http://www.imdb.com/title/tt0101368/

[Joker13]

thank you very much that was the right movie i had tried erything to find it but couldnt not sure why but i really loved that movie so again thank you