Ball-and-socket joint

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This article is about bone joints. Ball-and-socket joint_sentence_0

For ground glass joints, see Ground glass joint § Ball-and-socket joints. Ball-and-socket joint_sentence_1

For similar mechanical joints, see ball joint. Ball-and-socket joint_sentence_2

Ball-and-socket joint_table_infobox_0

Ball and socket jointBall-and-socket joint_header_cell_0_0_0
IdentifiersBall-and-socket joint_header_cell_0_1_0
TA98Ball-and-socket joint_header_cell_0_2_0 Ball-and-socket joint_cell_0_2_1
TA2Ball-and-socket joint_header_cell_0_3_0 Ball-and-socket joint_cell_0_3_1
FMABall-and-socket joint_header_cell_0_4_0 Ball-and-socket joint_cell_0_4_1

The ball and socket joint (or spheroid joint) is a type of synovial joint in which the ball-shaped surface of one rounded bone fits into the cup-like depression of another bone. Ball-and-socket joint_sentence_3

The distal bone is capable of motion around an indefinite number of axes, which have one common center. Ball-and-socket joint_sentence_4

This enables the joint to move in many directions. Ball-and-socket joint_sentence_5

An enarthrosis is a special kind of spheroidal joint in which the socket covers the sphere beyond its equator. Ball-and-socket joint_sentence_6

Examples Ball-and-socket joint_section_0

Examples of this form of articulation are found in the hip, where the round head of the femur (ball) rests in the cup-like acetabulum (socket) of the pelvis; and in the shoulder joint, where the rounded upper extremity of the humerus (ball) rests in the cup-like glenoid fossa (socket) of the shoulder blade. Ball-and-socket joint_sentence_7

(The shoulder also includes a sternoclavicular joint.) Ball-and-socket joint_sentence_8

Ball-and-socket joint_unordered_list_0

  • Ball-and-socket joint_item_0_0
  • Ball-and-socket joint_item_0_1
  • Ball-and-socket joint_item_0_2
    1. FemurBall-and-socket joint_item_0_3
    2. Femoral NeckBall-and-socket joint_item_0_4
    3. Femoral HeadBall-and-socket joint_item_0_5
    4. AcetabulumBall-and-socket joint_item_0_6
    5. Acetabular LabrumBall-and-socket joint_item_0_7
    6. PelvisBall-and-socket joint_item_0_8

Credits to the contents of this page go to the authors of the corresponding Wikipedia page: joint.