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Dorsal Lithotomy Position vs. Non-supine Positions During 2nd Stage of Labor: Quadriped

Please welcome new Science & Sensibility contributor, Amanda Blaz, DPT.  Amanda is a Physical Therapist in south central Montana and has recently completed her Certificate of Achievement in Pregnancy and Postpartum Physical Therapy (CAPP-OB) from the Section on Women’s Health of the American Physical Therapy Association, one of 28 physical therapists in the country to do so.  She will now be working toward that same certification in the area of pelvic floor rehabilitation.  Amanda is also a DONA-certified birth doula.  This is the first of a four-part series.

How Supine Positioning Became Commonplace
If you ask anyone in the United States to describe the appearance of a woman giving birth, a majority would likely describe the dorsal lithotomy position in which the mother is semi-recumbent with knees and hips flexed, all the while screaming and sweating.  This is the most popularly portrayed childbirth image in television and movies, and the most common pushing position in the American labor and delivery world (65.9% of women deliver in this position) (Shorten ‘02).  So it poses the question, if dorsal lithotomy is the most well-known and widely used position during second stage  labor, is it the best? 

Over the course of a four-part series I will look at the literature regarding the topic of second stage positioning, and offer a comparison of the dorsal lithotomy position vs. other non-supine positions, starting with the hands-and-knees position.  In the next three posts, lateral lying, squatting and other alternate positions will also be discussed.  While there are many differences in birth outcomes when comparing dorsal lithotomy to other second stage positions I will focus specifically on those related to the anatomy of the pelvis, pelvic floor musculature, orthopedic issues, and nerves of the pelvic and sacral areas.

Convenience vs. functionality
The position of the pelvis when in dorsal lithotomy places the birth canal at an angle that actually makes the baby travel upward.  There are many texts and articles that cite this position as the “gold standard,” suggesting that it is the most widely used and, therefore, the most satisfactory position for second stage.  However, the reason dorsal lithotomy has long-been considered “most satisfactory” is never delineated.  In fact, many well-known books, such as Human Labor and Birthby Dr. Harry Oxorn, suggest that second stage dorsal lithotomy positioning is the favored position because it is easier for the attendant to access the birth canal and perineum, and take care of any complications that may arise.  This doesn’t necessarily prove the position as the most satisfactory for maternal outcomes.

Anatomical Concerns
When in the dorsal lithotomy position, a woman is putting direct pressure on her sacrum (tailbone), forcing it into a flexed position and making the pelvic outlet smaller.  Also, as stated above, when in this position, the birth canal curve has an “uphill” orientation, forcing the mother to have to push the baby against gravity through an increasingly narrowed space (flexed sacrum pushing into pelvic outlet space).  Furthermore, it has been shown that the femoral nerve can be compressed at the inguinal ligament during delivery by thigh flexion, lateral hip rotation, and abduction (dorsal lithotomy position) (Sax 2006 ).  Femoral nerve injuries can lead to quadriceps weakness and/or sensory loss to the front/middle part of the thigh.  Weakness of the quadriceps can cause the knee to feel as though it is going to “buckle”—increasing the woman’s risk of an orthopedic injury.  Functionally, quadriceps weakness can make it difficult for the mother to go up and down stairs or get in and out of a squat position—a position that is used frequently to care for or play with a young child.  Lastly, dorsal lithotomy is a position to avoid when the following orthopedic issues are present during the pregnancy: sacroiliac joint dysfunction (common cause of low back pain in pregnancy), pelvic girdle pain, pubic symphysis dysfunction, coccydynia(painful tailbone), hip joint dysfunction, knee joint dysfunction.  When these issues are present, the dorsal lithotomy position places a large amount of stress on these joints and can increase pain, discomfort, or may even further injure the affected area. 

Take pubic symphysis separation for example:

                       

If the mother already has a pregnancy-induced pubic symphysis separation (even a partial separation), placing her in the dorsal lithotomy position is going to further distract the joint because of the excessive hip abduction and external rotation required.  Not only can this lead to excessive immediate postpartum pain, but prolonged supra-pubic pain and tenderness with radiation to the back or legs, difficulty walking, and occasionally, bladder dysfunction (Snow, 1997).

The Benefits of All-Fours
When a woman in is the quadruped (hands-and-knees) position, she has many advantages on her side:  For one, the birth canal curve is in a downward orientation, allowing gravity to aid in descent of the baby—promoting a gentler passage rather than a forced upward journey that involves significantly greater pressures and level of effort for the mother.  Secondly, the woman is able to sway side to side as well as flex and extend her spine to aid in pain/discomfort during and between contractions.  Similarly, quadriped is a favorable position when sacroiliac joint dysfunction, pubic symphysis dysfunction, coccydynia, spondylolisthesis, discogenic pain, or spinal stenosis is present.  This is due to the fact that joints are not placed in a position that places a large amount of compression or stress on them and can be easily adjusted by the mother to increase her comfort level.  Also, when in this position, a woman is more amenable to manual prompting by birth attendants to contract abdominal musculature and relax/contract the pelvic floor to aid with pushing.  Lastly, Soong (2002) showed that when giving birth in the quadruped position, a woman may have less need for perineal suturing when compared to the dorsal lithotomy position.  With a sample size of 3,756 women who had a spontaneous vaginal delivery, 61% of those giving birth in the hands and knees position had intact perineums.

Although there are many advantages to delivering in the hands and knees position, there are also times when it is not advantageous.  Obviously, it becomes a less likely option when an epidural has been placed (depending on analgesic used and flow rate). Secondly, some women may not be able to maintain this position because of decreased mobility, decreased core strength, increased fatigue, or other factors.  Lastly, this position is not favorable if the woman has any knee joint dysfunction as it requires weight bearing on the joint and at least 90° of knee flexion.

Current literature  supports the fact that non-supine positions are most often favorable when compared to the dorsal lithotomy position.  It has been found in many articles that women who delivered in a non-supine position tended to experience easier pushing, less pain with pushing, less back pain, and fewer perineal tears which leads to reduced need for suturing  (Gardosi, 1989, Liddell 1985).  I feel that because of these favorable outcomes, it should be at the forefront of our pregnancy and inter-partum community to educate women on the options they have as far as positioning during the second stage is concerned. Maybe one day we will see a baby delivered in a movie while the woman is on her hands and knees.

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References:

 Gardosi, J., Sylvester, S. and B-Lynch, C. (1989), Alternative positions in the second stage of labour: a randomized controlled trial. BJOG: An International Journal of Obstetrics & Gynaecology, 96: 1290–1296.

 Liddell, H. S. and Fisher, P. R. (1985), The Birthing Chair in the Second Stage of Labour. Australian and New Zealand Journal of Obstetrics and Gynaecology, 25: 65–68

 Sax TW, Rosenbaum RB.  Neuromuscular disorders in pregnancy.  Muscle Nerve.  2006 Nov; 34(5):559-71

 Shorten, A., Donsante, J. and Shorten, B. (2002), Birth Position, Accoucheur, and Perineal Outcomes: Informing Women About Choices for Vaginal Birth. Birth, 29: 18–27.

 Snow, R., Neubert, A. Peripartum Pubic Symphysis Separation:  A Case Series and Review of the Literature.  Obstetrical & Gynecological Survey: July 1997 – Volume 52 – Issue 7 – pp 438-443

 Soong B, Barnes M.  Maternal position at midwife-attended birth and perineal trauma: is there an association?  Birth.  2002;32(3):164-169.

Harry Oxorn, MD Human Labor and Birth (University of Ottawa, Ontario, Canada,McGraw-Hill Professional Publishing)1986

Posted by:  Amanda K. Blaz, PT, DPT


Doula Care, Practice Guidelines, Research, Science & Sensibility, Uncategorized , , , , , , , , , , , , , , ,

  1. January 18th, 2011 at 09:30 | #1

    “Maybe one day we will see a baby delivered in a movie while the woman is on her hands and knees.”

    I was hired as a consultant to a movie filming in our area. They wanted insights on making the birth scene most realistic. As I do find that most women, when left undisturbed, gravitate toward hands and knees for delivery… The mother in this movie delivers on hands and knees. :) They are finalizing distribution agreements right now, it should be out soon. The movie is called “The Lake Effect.” Will keep you all posted! The young actress who “gave birth” now stars in the TV series “No Ordinary Family.” Oh, also, the baby who was “born” belongs to one of my students/clients… So much fun!

    Sidenote aside, thank you for the wonderful post on second stage!

  2. January 18th, 2011 at 10:42 | #2

    Wow! This is wonderful to hear, Jessica! Please do keep us posted. I am aware that some networks (TLC, for example) send out movies/shows prior to their release so that bloggers can preview them and then write about them as the show/movie is about to air. Let us know if this would be a possibility with the film you have referenced.

  3. avatar
    Emily
    January 18th, 2011 at 19:35 | #3

    Every once in a while I think maybe I’ll have my second baby in the hospital; maybe having “succeeded” once at vaginal birth I could have the back-up safety of the hospital and a natural birth. And then I read something like this that reminds me just how much support and encouragement I had at my birth center birth, in this case to push in different positions. I pushed my daughter out on hands and knees, in a tiny space between the bed and the wall. Looking back, it was really not the most comfortable at all for my attendants, and I can’t really imagine feeling so comfortable on a hospital floor. I started pushing standing up and swatting with each contraction, moved to a stool and then finished up on hands and knees.

  4. avatar
    sasha
    January 18th, 2011 at 21:07 | #4

    Wonder explanation of why the supine position can be harmful as well as the benefits of all fours. Any suggestions on helping women to feel comfortable enough to “choose” these positions when their care provider is pressuring them to get on their backs?

    I’ve heard more than one nurse or doctor or hospital based CNM make the comment, that yes, it is pushing up hill, but the supine position – with the legs flexed back as far as humanly possible (and sometimes farther) “really opens up the pelvis” and “it’s like squatting while lying down”? As a doula it’s difficult to refute these statements in the moment other than to turn back to the mother and ask “what do YOU want to do?” “what’s most comfortable for YOU?” women tend to be very compliant in these circumstances.

    thanks for the resources and well-written article Amanda! i’m looking forward to the next installment.

  5. avatar
    Aradia
    January 19th, 2011 at 00:42 | #5

    Just wanted to direct anyone who is interested to this video clip (from youtube):

    http://www.youtube.com/watch?v=aoe3KSPjJME&playnext=1&list=PLE8A5B34F994EA73E&index=12

    from Eastenders(BBC). Women delivers in birthcenter/hospital on all- fours and they even make an umbilical cord/baby boy joke at the end. :-P

    This is a wonderful post! I look forward to the next segments. :-D

  6. January 19th, 2011 at 01:21 | #6

    Of course, the funny thing about that video clip is that she is fully clothed with gown/shirt extending all the way down past her back side! (the birth attendant seems to be able to tell exactly what’s going on without being able to see a thing!) Thanks for the link ~

  7. avatar
    A.C. Mase-Saint
    January 20th, 2011 at 20:46 | #7

    Thank you and well done!

  8. January 22nd, 2011 at 12:00 | #8

    @Kimmelin Hull
    Will see what I can find out, Kimmelin!

  9. January 24th, 2011 at 16:59 | #9

    Great article! Thank you for the attention to pubic symphysis issues, which are a serious problem for a lot of women, and which are made infinitely worse by the supine position.

    One note about the hands-knee position and the stress it places physically on those hands and knees. One way to make it easier on the body is to use it in water (or a slightly modified position). That’s how I used it. Very do-able.

    It is very hard to promote an image of birthing other than the supine these days. I worked on a play which had a birth scene in it, placed in the pioneer days. The director had the woman on her back, knees flexed and back, like a hospital birth. I pointed out that most women didn’t birth like that then, provided some documentation, and even found a picture of it online to demonstrate:

    http://faculty.uml.edu/sgallagher/BirthScene.jpg

    The director incorporated my input into rehearsal, but before the actual performance, decided that nobody in the audience would understand because she “didn’t look like she was giving birth.” We found a compromise but it was frustrating because that supine position is so ingrained into our cultural expectations that anything else is confusing to the audience. That is difficult to overcome.

  10. avatar
    Evamarie
    January 24th, 2011 at 23:28 | #10

    I am curious if there are any studies on a supported open squat for second stage? Open squat being hips in line with knees and tailbone pointing to upward.

  11. avatar
    Andi
    January 25th, 2011 at 08:45 | #11

    Amanda… great article!! Such great information to get “the word” out!! Can’t wait for more installments!! ;)

  12. avatar
    Amanda Blaz, DPT
    January 25th, 2011 at 14:05 | #12

    @Evamarie

    There are a few articles about open squat which I will cover in one of the next part of this series of articles. If you would like them prior to that time, I can send you the references. Thank you for your question!

  13. avatar
    Deb Richert
    January 29th, 2011 at 11:39 | #13

    Amanda, I would love to look at the references you mention about open squat position – would you mind sending them to me? I’m currently in school, working toward eventually becoming a certified nurse midwife and am now learning about the research process, so I need to pick a topic to use as I work through the steps. Birth position is of tremendous interest to me!

  14. avatar
    Amanda Blaz, DPT
    February 3rd, 2011 at 19:40 | #14

    I will send them to you asap – do you mind sending me your email address? My email is amanda@mosaicrehabmt.com

  1. January 19th, 2011 at 16:43 | #1
  2. March 12th, 2011 at 11:47 | #2
  3. April 20th, 2011 at 07:50 | #3