Ishium: tuber sacrale, tuber coxae, os coxae, aceabulum, pubis, pelvis symphysis, obturator foramen. Ischiatic tuberosity: pes (foot, arthrology: study of joints, articulation/joint, two or more bones are united/joined by fibrous, elastic or cartilaginous tissue. Joints are classified by the number of bones articulated: simple joints, two bones that move with one another, compound joints, more than two bones moving with one another. Joint classification: fibrous, short, direct, and often temporary, little to no movement, cartilaginous, united by fibrocartilage/hyline cartilage, limited movement, cartilage replaced by bone when animal stops growing, synovial joint, true joint. Joints of thoracic limb reduce friction: shoulder joint, cubital joint, elbow, carpal joint, knee, metacarpophalangeal joint, fetlock joint, similar to human knuckle, proximal interphalangeal joint, pastern joint, distal interphalangeal joint, coffin joint. Immovable, between wings of the sacrum and ileum: hip joint, between acetabulum of pelvis and head of the femur, freely-moveable, stifle joint, patella and femur and tibia, tarsus (hock, distal tibia and proximal metatarsal bone.