Final answer:
Rotational movements in the hip and shoulder joints primarily involve muscles. Ligaments provide stability and restrict the range of motion, while tendons connect muscles to bones. Synovial fluid lubricates the joint, reducing friction and allowing for smooth movement.
Step-by-step explanation:
Rotational movements in the hip and shoulder joints primarily involve muscles. Ligaments provide stability and restrict the range of motion, while tendons connect muscles to bones. Synovial fluid lubricates the joint, reducing friction and allowing for smooth movement.