I found this on the internet which explains what a contracture is:-
A contracture is a chronic loss of joint motion caused by shortening of a muscle or tendon. In late stage Alzheimer’s disease, contractures of the knees, elbows, and hands form mostly from lack of movement- enhanced by neurologic changes in muscle tone making joints more resistant to passive movement.
Many people in the later stages of Alzheimer’s disease sit… a lot. They stay in one position with their knees and elbows bent. Frequently, if they are seated in a wheelchair with sling upholstery and poor pelvic support, their thighs and knees touch. They may even pull their arms in tight against their chest if they feel cold. Sitting in this position for several hours, and then being transferred back to bed curled up in this same position, leads very quickly to limited joint movement. This makes it very hard to clean, feed, and dress someone whose limbs don’t move well.
Prevention of contractures is easy, but it requires diligence and consistency. Simple range of motion exercises- moving the elbows, fingers, wrists, shoulders, knees, and ankles to the limits of their range- will prevent contractures and painful stiff joints. If someone becomes resistant to range of motion, which is common if a person is confused or in pain, then there are ways to “trick” them into active movement that can be helpful. We’ll save those techniques for another post.
A good wheelchair with appropriate limb, trunk, and pelvic support, and physical activities that engage the person to reach, shift position, or use his or her hands can make a tremendous impact. Frequent range of motion, encouraging extension in bed, and providing medication or modalities for pain modulation can be all it takes to prevent contractures.