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Shoulder Type: Ball and socket Bones: Humerus, scapula Movement: Flexion, extension, abduction, adduction, rotation, circumduction Greater range of movement than hip, but not quite as stable

Elbow Type: Hinge Bones: Humerus, ulna, radius Movement: Flexion, extension Biceps and triceps move this joint.

Hip Type: Ball and socket Bones: Femur, pelvis Movement: Flexion, extension, abduction, adduction, rotation, circumduction Not as great a range of movement as the shoulder, but much more stable.

Knee Type: Hinge Bones: Femur, tibia Movement: Flexion, extension Quadriceps and hamstrings move this joint.