Emergency Medicine Hub / Trauma & Orthopedics • 3 min read • 2 sections

Pelvic Ring Fractures & Acetabular Trauma

Comprehensive emergency evaluation and protocolized resuscitation of high-energy pelvic ring fractures and acetabular trauma: biomechanics of the pelvic ring ('you cannot break a pretzel in only one place'), the Young-Burgess fracture classification (Lateral Compression [LC I-III], Anteroposterior Compression [APC I-III/'open book'], and Vertical Shear [VS]), life-threatening retroperitoneal venous plexus vs. internal iliac arterial hemorrhage, application of commercial pelvic circumferential compression devices (pelvic binders) centered over the greater trochanters, contraindications to pelvic rocking, and interventional radiology angio-embolization vs. pre-peritoneal pelvic packing.

Resuscitation Quick Actions • First 2 Minutes

High-Acuity

DO NOT Rock the Pelvis

Examine pelvis ONCE with gentle inward compression; NEVER perform vigorous or repetitive pelvic rocking (dislodges clots)

Pelvic Binder Placement Site

Place binder centered precisely over the GREATER TROCHANTERS (level of pubic symphysis); placing it high over iliac crests is INEFFECTIVE

Internal Rotation of Legs

Internally rotate both lower extremities and tape the feet together; reduces pelvic volume and aids mechanical reduction of open-book fractures

Retroperitoneal Bleed Source

85–90% of pelvic hemorrhage is LOW-PRESSURE VENOUS (presacral plexus) and cancellous bone; 10–15% is ARTERIAL (internal iliac branches)

Unstable Open-Book Algorithm

Pelvic binder + Massive Transfusion Protocol (1:1:1) + Stat IR Angio-embolization OR Pre-Peritoneal Pelvic Packing in OR

High-Riding Prostate Sign

Check DRE in males: high-riding or non-palpable prostate + blood at urethral meatus = URETHRAL TRANSECTION (NO FOLEY CATHETER; retrograde urethrogram)

Bottom-Line Clinical Pearl

Pelvic ring disruption is a leading cause of preventable traumatic death due to massive retroperitoneal hemorrhage. Anatomically, the pelvis functions as a rigid ring: breaking the ring in one location almost always implies a second disruption elsewhere in the ring. The Young-Burgess classification stratifies hemorrhage risk: Anteroposterior Compression (APC II and III/'open book') and Vertical Shear (VS) carry catastrophic hemorrhage risk from tearing of the posterior sacroiliac ligaments and branches of the internal iliac artery/vein. Physical exam: NEVER PERFORM REPETITIVE PELVIC ROCKING (rocking dislodges newly formed retroperitoneal blood clots and triggers torrential bleeding). Immediately apply a commercial Pelvic Binder (or inverted sheet) CENTERED PRECISELY OVER THE GREATER TROCHANTERS (not the iliac crests!). If the patient remains hemodynamically unstable despite blood resuscitation and pelvic binding: activate Massive Transfusion Protocol, and transport immediately to Interventional Radiology for Angioembolization or to the OR for Pre-Peritoneal Pelvic Packing.

1. Biomechanics & The Young-Burgess Classification

The bony pelvis functions mechanically as a closed ring. The anterior pubic bones and symphysis contribute only 40% of pelvic stability, whereas the massive posterior sacroiliac ligamentous complex provides 60% of structural load-bearing stability. High-energy force vectors determine the disruption pattern:

Young-Burgess Mechanism	Force Vector & Ligamentous Disruption	Pelvic Ring Stability	Hemorrhage Risk & Mortality
Lateral Compression (LC I, II, III)	Side-impact force (T-bone MVC, pedestrian struck from side). Crushes the hemipelvis inward: pubic rami fractures + ipsilateral (LC I) or contralateral (LC II/III 'windswept pelvis') sacral crush.	Mechanically Stable to Rotationally Unstable. Pelvic volume is decreased (compression), which naturally tamponades bleeding.	Lowest mortality (5–10%); severe internal visceral injury (bladder, spleen, diaphragm) is common.
Anteroposterior Compression (APC I, II, III)	Direct frontal impact (head-on collision, motorcycle crash). Tears the anterior pubic symphysis ('Open-Book' pelvis). APC II tears sacrotuberous/sacrospinous ligaments; APC III completely disrupts posterior sacroiliac complex.	Rotational and Vertically Unstable. The hemipelvis hinges outward, dramatically expanding total pelvic volume and obliterating retroperitoneal tamponade.	Extreme Hemorrhage Risk (Mortality 20–40%). Massive tearing of the presacral venous plexus and internal iliac arterial branches (superior gluteal, internal pudendal).
Vertical Shear (VS)	High-energy axial loading force (fall from significant height landing on one extended leg, ejection). The entire hemipelvis is displaced cephalad, completely shearing all anterior and posterior ligaments.	Completely Unstable (Vertically & Rotationally).	High mortality (> 25%) from severe retroperitoneal vascular disruption, hypovolemic shock, and associated spinal/visceral trauma.

2. Pelvic Binder Application: The Greater Trochanter Mandate

In an unstable open-book pelvic fracture, applying a circumferential pelvic compression device (commercial pelvic binder or improvised bedsheet) mechanically reduces the disrupted pelvic volume, stabilizing cancellous bone fracture edges and re-establishing the closed retroperitoneal space to permit natural hematoma tamponade.

Step Sequence	Procedural Action & Technique	Critical Anatomical Rationale
Anatomical Landmark Check	Center the binder DIRECTLY OVER THE GREATER TROCHANTERS bilaterally (at the level of the pubic symphysis)	THE MOST COMMON ERROR IS PLACING THE BINDER TOO HIGH (OVER THE ILIAC CRESTS)! High placement acts as a fulcrum that levers the lower pelvis wider, worsening internal hemorrhage. Greater trochanter placement directly compresses the femoral heads into the acetabulae, clamping the ring shut.
Lower Extremity Reduction	Internally rotate both lower extremities and tie the feet or knees together with a soft strap or tape	Internal rotation of the hips significantly aids anatomical reduction of the widened pelvic ring.
Tensioning & Monitoring	Tighten the binder until the mechanical tensioning device clicks (approximately 150–180 N of force)	Check distal femoral/pedal pulses before and after binder application; skin breakdown can occur if left in place $> 24\text{ hours}$.

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