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Obstetrics I - OSCE > Female Pelvis > Flashcards

Female Pelvis Flashcards

1
Q
A
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1
Q

Plane of Pelvic Inlet

A

Imaginary line joining the following points:

Upper border of symphysis pubis.
Superior pubic ramus.
Iliopectineal eminence.
Iliopectineal line.
Sacroiliac joint.
Ala of sacrum.
Pubic tubercle.
Pubic crest.
Promontory of sacrum.
Other points on opposite side.

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2
Q

Diameters of Pelvic Inlet

A
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3
Q

Diameters of Pelvic Inlet

  • AP
A
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4
Q

Diameters of Pelvic Inlet

A
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5
Q

Diameters of Pelvic Inlet

  • Transverse
A
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6
Q

Diameters of Pelvic Inlet

  • Other Diameters
A
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7
Q

Length of True Conjugate (Anatomical AP - Conjugata Vera)

A

11cm

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8
Q

Extent of True Conjugate (Anatomical AP - Conjugata Vera)

A
  • Tip of sacral promontory

to

  • Posterior part of upper border of symphysis pubis
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9
Q

Importance of True Conjugate (Anatomical AP - Conjugata Vera)

A

Divided by anatomical transverse diameter into:

  • Anterior sagittal diameter of inlet (7 cm)
  • Posterior sagittal diameter of inlet (4 cm)
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10
Q

Length of Obstetric Conjuate Diameter

A

10.5 cm

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11
Q

Extent of Obstetric Conjuate Diameter

A
  • Tip of sacral promontory

to

  • Most bulging point on posterior surface of symphysis pubis
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12
Q

Importance of Obstetric Conjuate Diameter

A
  • Most important A-P diameter it is the shortest one through which fetus must pass)
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13
Q

Length of Diagonal Conjugate Diameter

A

12.5 cm

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14
Q

Extent of Diagonal Conjugate Diameter

A
  • Tip of sacral promontory

to

  • Lower border of symphysis pubis
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15
Q

Importance of Diagonal Conjugate Diameter

A
  • Can be measured clinically & approximate length of true conjugate is calculated by subtracting 1.5 cm.
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16
Q

Length of Anatomical Transverse Diameter

A

13 cm

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17
Q

Extent of Anatomical Transverse Diameter

A

() 2 farthest points on iliopectineal line

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18
Q

Importance of Anatomical Transverse Diameter

A

Divides true conjugate into:

  • Anterior sagittal diameter of inlet (7 cm)
  • Posterior sagittal diameter of inlet (4 cm)
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19
Q

Length of Obstetric transverse Diameter

A

12 cm

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20
Q

Extent of Obstetric transverse Diameter

A

Bisects true conjugate diameter

21
Q

Importance of Obstetric transverse Diameter

A

The available transverse diameter for head (the shortest)

22
Q

Length of Oblique Diameters

A

12 cm

23
Q

Extent of Oblique Diameters

A
  • Sacroiliac joint on one side

to

  • Iliopectineal eminence on the other side.
24
Q

Importance of Oblique Diameters

A

Named (Rt or Lt) according to joint & Lt diameter is slightly shorter than Rt due to:

  • More frequent use of Rt leg,
  • Encroachment of sigmoid colon on Lt diameter.
25
Q

Length of Sacrocotyloid Diameters

A

9-9.5 cm

26
Q

Extent of Sacrocotyloid Diameters

A
  • Center of sacral promontory.

to

  • Iliopectineal eminence
27
Q

Importance of Sacrocotyloid Diameters

A

Named (Rt or Lt) according to eminence

28
Q

Plane of Obstetric Midpelvis

  • Importance
A
29
Q

Diameters of Anatomical Outlet

A
  • AP
  • Transverse (bituberous)
  • Anterior Sagittal
  • Posterior Sagittal
30
Q

Diameters of Anatomical Outlet

  • AP
A
31
Q

Diameters of Anatomical Outlet

  • Transverse (Bituberous)
A
32
Q

Diameters of Anatomical Outlet

  • Anterior Sagittal
A
33
Q

Diameters of Anatomical Outlet

  • Posterior Sagittal
A
34
Q

Thorn’s (Klein’s) Dictum

A
  • To allow average sized fetal head to pass through pelvic outlet → bituberous diameter + posterior sagittal diameter of pelvic outlet must be > 15 cm provided that bituberous diameter is > 8 cm.
35
Q

Diameters of Bony Pelvis (Summary)

  • Pelvic Inlet
A
36
Q

Diameters of Bony Pelvis (Summary)

  • Plane of GPD
A

12 cm all round

37
Q

Diameters of Bony Pelvis (Summary)

  • Plane of MP
A
38
Q

Diameters of Bony Pelvis (Summary)

  • Plane of LPD
A
39
Q

Diameters of Bony Pelvis (Summary)

  • Anatomical Outlet
A
40
Q

Classification of Female Pelvis

A
41
Q

Classification of Female Pelvis is based on ……

A

Caldwell & Moloy have classified female pelvises based on radiological studies into four types

42
Q

Gynecoid Pelvis

  • Incidence
  • Pelvic Inlet
  • Sacrum
  • Pelvic Cavity
  • Sunpubic Angle
  • Head Engagment
  • Pelvic Reserve Capacity
  • Clinical Importance
A
43
Q

Android Pelvis

  • Incidence
  • Pelvic Inlet
  • Sacrum
  • Pelvic Cavity
  • Sunpubic Angle
  • Head Engagment
  • Pelvic Reserve Capacity
  • Clinical Importance
A
44
Q

Anthropoid Pelvis

  • Incidence
  • Pelvic Inlet
  • Sacrum
  • Pelvic Cavity
  • Sunpubic Angle
  • Head Engagment
  • Pelvic Reserve Capacity
  • Clinical Importance
A
45
Q

Platypelloid Pelvis

  • Incidence
  • Pelvic Inlet
  • Sacrum
  • Pelvic Cavity
  • Sunpubic Angle
  • Head Engagment
  • Pelvic Reserve Capacity
  • Clinical Importance
A
46
Q

Compare between Gtnecoid, Android, Anthropoid, Platypelloid Pelvis in terms of:

  • Incidence
  • Pelvic Inlet
  • Sacrum
  • Pelvic Cavity
  • Sunpubic Angle
  • Head Engagment
  • Pelvic Reserve Capacity
  • Clinical Importance
A
47
Q

Incidence of Gynecoid Pelvis

A

50 %

48
Q

Pelvic Inlet in Gynecoid Pelvis

A

oval

49
Q

Pelvic Inlet in Android Pelvis

A
  • Triangular with narrow anterior segment & wide flat posterior segment
50
Q

Head Engagment in Android Pelvis

A

In transverse diameter

Obstetrics I - OSCE (32 decks)

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