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Pelvis and Pelvic Ring Anatomy

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Questions and Answers

What is the primary function of the sacroiliac joint?

To provide rotational movement during gait

To provide stability (correct)

To provide flexibility in the pelvic region

To transfer loads between the axial skeleton and the lower limb

What is the role of the pubic symphysis joint in the pelvic ring?

To support the sacrum in the pelvic ring

To facilitate pelvic rotation during gait

To provide additional structural stability to the pelvic ring (correct)

To transfer loads from the trunk to the femurs

What is the key element that provides stability to the pelvic ring?

The ilium, pubis, and ischium bones

The pubic symphysis joint

The fit and stability of the sacrum (correct)

The sacroiliac joints

What is the primary role of the pelvic ring?

To transfer loads bidirectionally between the trunk and femurs Signup and view all the answers

How does the pelvis integrate with the spine and lower limb?

It integrates firmly with both the spine and the lower limb Signup and view all the answers

What is the significance of the sacrum in the pelvic ring?

It is the keystone of the pelvis Signup and view all the answers

What is the primary function of the multifidus, transversus abdominis, diaphragm, and pelvic floor muscles in relation to pelvic stability?

To provide innermost stability Signup and view all the answers

How does the position of the hips affect the pelvic inlet and outlet during labour?

Hip extension increases the pelvic inlet and outlet Signup and view all the answers

What is the result of the pull of the flexor muscles (psoas) when the hips are extended?

The pelvis tilts anteriorly Signup and view all the answers

What happens to the pelvic girdle as a whole when one rises from supine lying to sitting?

It rotates anteriorly Signup and view all the answers

What is the effect of the hamstrings on the pelvis when the hips are flexed?

The pelvis tilts posteriorly Signup and view all the answers

What is the movement of the iliac bone around the axis of nutation?

Rotation of the SI joint into nutation Signup and view all the answers

What is the location of the sacroiliac joint in relation to the posterior superior iliac-spine of the ilium?

Anterior to Signup and view all the answers

What type of cartilage covers the iliac surface of the sacroiliac joint?

Fibrocartilage Signup and view all the answers

What is the shape of the articular surface of the sacroiliac joint?

Semicircular Signup and view all the answers

What is the function of the reciprocally contoured elevations and depressions in the sacroiliac joint?

To increase friction Signup and view all the answers

What type of joint is the sacroiliac joint?

Hybrid joint Signup and view all the answers

What is the primary function of the interosseous S-I ligaments in the sacroiliac joint?

To limit anterior motion Signup and view all the answers