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[ Home ](https://mdster.com) 2. [ Blog ](https://mdster.com/blog) 3. [ Medical Education ](https://mdster.com/blog?category=medical-education) 4. Shoulder Dystocia Management: The Core Algorithm for OVD [ Medical Education ](https://mdster.com/blog?category=medical-education) Shoulder Dystocia Management: The Core Algorithm for OVD ========================================================== A high-yield, clinically practical approach to McRoberts, suprapubic pressure, posterior arm delivery, rescue maneuvers, and debriefing. [ MDster Editorial Team ](https://mdster.com/about) · Jun 02, 2026 · 5 min read · 407 [ Reviewed by Dr. Ali Ragab, MBBCH, MSc, MCAI ](https://mdster.com/medical-reviewers/dr-ali-ragab) [Editorial Policy](https://mdster.com/editorial-policy) | [Corrections Policy](https://mdster.com/corrections) [ Board Review ](https://mdster.com/blog?tag=board-review) [ Obstetrics & Gynecology ](https://mdster.com/blog?tag=obstetrics-gynecology) [ Obstetric Emergencies ](https://mdster.com/blog?tag=obstetric-emergencies) [ Operative Vaginal Delivery ](https://mdster.com/blog?tag=operative-vaginal-delivery) [ Labor Management ](https://mdster.com/blog?tag=labor-management) ![Shoulder Dystocia Management: The Core Algorithm for OVD](https://mdster.com/storage/blog/images/shoulder-dystocia-management-the-core-algorithm-for-ovd.jpg) Share this article Share this post On this page 1. [ Recognize It, Announce It, Run the Room ](#recognize-it-announce-it-run-the-room) 2. [ First-Line Maneuvers: McRoberts and Suprapubic Pressure ](#first-line-maneuvers-mcroberts-and-suprapubic-pressure) 3. [ McRoberts: change the pelvis, not the fetal neck ](#mcroberts-change-the-pelvis-not-the-fetal-neck) 4. [ Suprapubic pressure: compress and rotate the shoulders ](#suprapubic-pressure-compress-and-rotate-the-shoulders) 5. [ When First-Line Fails: Go Internal, Go Purposefully ](#when-first-line-fails-go-internal-go-purposefully) 6. [ Delivery of the posterior arm ](#delivery-of-the-posterior-arm) 7. [ Internal rotational maneuvers ](#internal-rotational-maneuvers) 8. [ Rescue Maneuvers: Escalate Without Chaos ](#rescue-maneuvers-escalate-without-chaos) 9. [ Documentation and Debrief: Part of the Algorithm ](#documentation-and-debrief-part-of-the-algorithm) 10. [ Key Takeaways ](#key-takeaways) 11. [ Conclusion ](#conclusion) 12. [ Frequently Asked Questions ](#blog-faqs) 13. [ References ](#references-heading) On this page 1. [ Recognize It, Announce It, Run the Room ](#recognize-it-announce-it-run-the-room) 2. [ First-Line Maneuvers: McRoberts and Suprapubic Pressure ](#first-line-maneuvers-mcroberts-and-suprapubic-pressure) 3. [ McRoberts: change the pelvis, not the fetal neck ](#mcroberts-change-the-pelvis-not-the-fetal-neck) 4. [ Suprapubic pressure: compress and rotate the shoulders ](#suprapubic-pressure-compress-and-rotate-the-shoulders) 5. [ When First-Line Fails: Go Internal, Go Purposefully ](#when-first-line-fails-go-internal-go-purposefully) 6. [ Delivery of the posterior arm ](#delivery-of-the-posterior-arm) 7. [ Internal rotational maneuvers ](#internal-rotational-maneuvers) 8. [ Rescue Maneuvers: Escalate Without Chaos ](#rescue-maneuvers-escalate-without-chaos) 9. [ Documentation and Debrief: Part of the Algorithm ](#documentation-and-debrief-part-of-the-algorithm) 10. [ Key Takeaways ](#key-takeaways) 11. [ Conclusion ](#conclusion) 12. [ Frequently Asked Questions ](#blog-faqs) 13. [ References ](#references-heading) The vacuum comes off, the head delivers, and then nothing follows. This is the moment that tests whether the room has a shared algorithm—or just anxiety. Shoulder dystocia is especially relevant after operative vaginal delivery because traction has already entered the scene, and the temptation to pull harder is exactly what injures babies. Recognize It, Announce It, Run the Room --------------------------------------- Shoulder dystocia is a clinical diagnosis: the fetal shoulders do not deliver with gentle axial traction after the head is born, and additional maneuvers are required. The turtle sign may help, but do not wait for a dramatic sign. Say it out loud: “This is a shoulder dystocia.” Then assign roles immediately: - Call obstetric, anesthesia, neonatal, and nursing help. - Note the time of head delivery. - Ask for a recorder. - Stop routine traction and coordinate maternal pushing. - Keep communication calm, closed-loop, and explicit. > **Clinical Pearl:** The safest first maneuver is not a stronger pull. It is a louder diagnosis, better positioning, and a team that knows the next two steps before you ask. First-Line Maneuvers: McRoberts and Suprapubic Pressure ------------------------------------------------------- ### McRoberts: change the pelvis, not the fetal neck Start with McRoberts. Hyperflex the maternal hips so the thighs are sharply flexed onto the abdomen. This rotates the symphysis pubis cephalad and flattens the lumbosacral angle, helping the anterior shoulder slip from behind the pubic symphysis. Do not describe McRoberts as “pull the legs back a little.” The assistants must flex the hips effectively, usually with knees toward the chest or axillae. Maintain gentle axial traction only, aligned with the fetal spine. ### Suprapubic pressure: compress and rotate the shoulders Add suprapubic pressure early, often simultaneously with McRoberts. The assistant applies firm pressure just above the pubic symphysis, directed downward and laterally toward the fetal chest. The goal is to adduct the anterior shoulder and reduce the bisacromial diameter. Never use fundal pressure. It worsens impaction, increases uterine rupture risk, and is a classic board exam trap. ManeuverWhat it accomplishesBoard pitfallMcRobertsRotates pelvis, frees anterior shoulderInadequate hip flexionSuprapubic pressureAdducts anterior shoulderConfusing it with fundal pressureEpisiotomyCreates hand access if neededDoes not fix bony impaction When First-Line Fails: Go Internal, Go Purposefully --------------------------------------------------- If McRoberts plus suprapubic pressure does not work quickly, do not keep repeating them while the clock runs. Move to internal maneuvers or posterior arm delivery. Episiotomy may help if your hand cannot enter, but it is not mandatory and does not relieve the shoulder by itself. ### Delivery of the posterior arm Posterior arm delivery is high-yield because it changes the geometry. Once the posterior arm is delivered, the obstructing diameter decreases from bisacromial to an oblique/acromial-axillary configuration, often allowing the anterior shoulder to disimpact. Use a deliberate technique: 1. Insert the appropriate hand into the posterior vagina. 2. Follow the fetal chest, not the back. 3. Find the posterior elbow, forearm, or wrist. 4. Flex the elbow by pressing at the antecubital fossa. 5. Sweep the forearm across the fetal chest and out over the perineum. 6. Deliver the body with gentle traction. Avoid grabbing and yanking on the humerus. Humeral fracture can still occur, but controlled flexion and sweeping are safer than uncontrolled force. ### Internal rotational maneuvers Rotational maneuvers work by turning the shoulders into an oblique diameter. Rubin II adducts the anterior shoulder by pushing its posterior surface toward the fetal chest. Woods corkscrew adds pressure to the anterior surface of the posterior shoulder to rotate the fetus further. Do not get paralyzed by eponyms. On exams, know the names; in the room, remember the principle: make the shoulders smaller and rotate them out of the anteroposterior trap. Rescue Maneuvers: Escalate Without Chaos ---------------------------------------- If posterior arm and rotation fail, choose the next maneuver based on maternal mobility, fetal position, and available expertise. The Gaskin all-fours maneuver can help if the patient can safely reposition. Posterior axillary sling traction or the Menticoglou technique may be useful when the posterior arm is inaccessible. Last-resort maneuvers are rare and should trigger senior help immediately: - Intentional clavicular fracture to reduce shoulder width. - Zavanelli maneuver with immediate cesarean preparation. - Abdominal rescue through hysterotomy. - Symphysiotomy, rarely used in modern U.S. practice. The dangerous error is not choosing the “wrong” second-line maneuver. The dangerous error is persisting too long with a failed maneuver while using increasing traction. Documentation and Debrief: Part of the Algorithm ------------------------------------------------ The delivery is not over when the baby is out. Examine the newborn for brachial plexus injury, clavicular or humeral fracture, and depression requiring resuscitation. Examine the mother for postpartum hemorrhage and obstetric anal sphincter injury. Document immediately while memory is fresh: - Time of head delivery and body delivery. - Time shoulder dystocia was recognized. - Sequence and duration of maneuvers. - Personnel called and present. - Direction and type of traction used. - Neonatal condition, Apgars, cord gases if obtained. - Maternal lacerations, hemorrhage, and counseling. Debrief the team without blame. Ask what went well, what slowed response, and whether the cognitive aid was used. Then debrief the patient in plain language: explain what happened, what maneuvers were used, neonatal findings, and implications for a future pregnancy. Key Takeaways ------------- - Announce shoulder dystocia clearly and start the clock. - McRoberts plus suprapubic pressure is first-line. - Fundal pressure and excessive traction are never correct. - If first-line maneuvers fail, move promptly to posterior arm delivery or internal rotation. - Episiotomy improves access only; it does not relieve bony impaction. - Rescue maneuvers require senior help and calm escalation. - Precise documentation and debriefing are patient care, not paperwork. Conclusion ---------- Shoulder dystocia management is a choreography problem under time pressure. Know the anatomy, commit to the algorithm, and protect the brachial plexus by resisting force. In OVD and spontaneous birth alike, calm sequencing beats heroic traction every time. Frequently Asked Questions ---------------------------- ### What is the first maneuver for shoulder dystocia on board exams? McRoberts maneuver is the first-line maneuver, usually combined promptly with suprapubic pressure. Avoid fundal pressure and excessive traction. ### When should posterior arm delivery be attempted? Attempt posterior arm delivery when McRoberts and suprapubic pressure do not rapidly resolve the dystocia, or when your unit algorithm prioritizes it before rotational maneuvers. ### Does episiotomy treat shoulder dystocia? No. Shoulder dystocia is a bony impaction. Episiotomy may improve access for internal maneuvers but does not release the shoulder by itself. ### What should be documented after a shoulder dystocia? Document head-to-body interval, recognition time, maneuver sequence, personnel present, traction used, neonatal status, maternal injuries, and counseling. ### What is the biggest management error during shoulder dystocia? The most dangerous error is escalating traction instead of escalating maneuvers. Pulling harder increases risk of brachial plexus injury. References (4) ------------------ 1. 1. [ ACOG Practice Bulletin No. 178: Shoulder Dystocia. Obstetrics & Gynecology. 2017. ](https://pubmed.ncbi.nlm.nih.gov/28426618/) 2. 2. [ RCOG Green-top Guideline No. 42: Shoulder Dystocia. ](https://www.rcog.org.uk/guidance/browse-all-guidance/green-top-guidelines/shoulder-dystocia-green-top-guideline-no-42/) 3. 3. [ Hill DA, Lense J, Roepcke F. Shoulder Dystocia: Managing an Obstetric Emergency. American Family Physician. 2020. ](https://www.aafp.org/pubs/afp/issues/2020/0715/p84.html) 4. 4. [ AHRQ Labor and Delivery Unit Safety: Shoulder Dystocia. ](https://www.ahrq.gov/patient-safety/settings/labor-delivery/perinatal-care/modules/strategies/labor-delivery-unit/tool-shoulder-dystocia.html) Study pathway Build confidence in OB/GYN with focused practice -------------------------------------------------- - Labor & delivery + postpartum essentials - Gynecology, screening, and common procedures - Review weak topics and improve faster Free 5-day trial No credit card required. 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