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Pelvimetry is the measurement of the female pelvis. [1] It can theoretically identify cephalo-pelvic disproportion, which is when the capacity of the pelvis is inadequate to allow the fetus to negotiate the birth canal. However, clinical evidence indicate that all pregnant women should be allowed a trial of labor regardless of pelvimetry results.
Symphysis os-ischium angle (of Tönnis): This evaluates the pelvic position in the sagittal plane. Lines are drawn from the highest point of the ischium to the most prominent point of the symphysis, joining at the inside of the pelvis. The range of normal values is from 90 to 135° and is related to the infant’s age. [3]
An X-ray film obtained in the AP view of the pelvic inlet and outlet will show a marked gap between the pubic bones. [3] A normal pelvis will show a gap that is 4–5 mm. However, in pregnancy the hormonal influences cause relaxation of the connecting ligaments and the bones separate up to 9 mm. A gap measuring greater than 10 mm indicates a ...
The pelvic inlet or superior aperture of the pelvis is a planar surface which defines the boundary between the pelvic cavity and the abdominal cavity (or, ...
An anterior-posterior (AP) X-ray of the pelvis and a cross-table lateral X-ray [24] of the effected hip are ordered for diagnosis. [ 4 ] [ 5 ] [ 16 ] The size of the head of the femur is then compared across both sides of the pelvis.
The lower circumference of the lesser pelvis is very irregular; the space enclosed by it is named the inferior aperture or pelvic outlet. It is an important component of pelvimetry . Boundaries
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The knee is investigated and found to be normal. [7] The diagnosis requires x-rays of the pelvis, with anteriorposterior (AP) and frog-leg lateral views. [11] The appearance of the head of the femur in relation to the shaft likens that of a "melting ice cream cone", visible with Klein's line.