The Severed Arm

The Severed Arm is a 1973 horror film cowritten and directed by Thomas S. Alderman.

Several years later, members of the group are being killed by having their arm hacked off in the same way as their original victim. All suspect the original victim who has disappeared and contact the victims daughter who offers to help find her father and stop the killings.In the end, it is revealed that the daughter was behind the killings. She kidnaps the original leader of the caving group who came up with the idea to cut her fathers arm off. She seals him in a room beneath an isolated country house where he will slowly starve to death...unless he cuts off his own arm. ........

Source: Wikipedia