Distinguish pelvic translation, rotation, and flares with landmark comparisons, localized treatment principles, and cases that test safe clinical reasoning.
One high ASIS does not tell you whether an innominate is rotated, translated, or simply being measured inconsistently. Start by asking which other landmarks share the finding. A pubic tubercle that sits high by itself tells a different story from an entire set of ipsilateral landmarks that sit high together. Then ask whether the history permits a routine structural examination at all.
Locate the structure before naming the pattern
Each innominate contains the ilium, ischium, and pubis. It articulates with the sacrum posteriorly at the sacroiliac joint and with the opposite pubis anteriorly at the symphysis. The ASIS and PSIS belong to the ilium. The pubic tubercle samples the anterior ring, while the ischial tuberosity samples its inferior portion. These are related landmarks on one pelvic half, not four independent bones.
Anterior view
ASIS above and lateral. Pubic tubercle below and near the midline. The symphysis joins the two pubic bodies.
Posterior view
PSIS beside the sacral base. Ischial tuberosity farther inferior. The sacrum lies between the two innominates.
Compare the landmark positions from the front and back. Right and left always refer to the patient.
In osteopathic terminology, a somatic dysfunction names an observed relationship and restriction. A superior shear pattern does not establish a centimeter-scale displacement or an unstable pelvic ring. The sacroiliac joints have small physiological excursions, and surface palpation cannot measure a fracture displacement. Keep the osteopathic description separate from the structural injuries that may require urgent imaging and stabilization. [1][9]
Obtain permission for the examination, explain the landmarks, provide draping, and use appropriate chaperone practices for pubic examination. A declined component remains unexamined. Do not fill the gap with a presumed normal result. Compare sides in the same position, using similar hand contact and pressure. Apparent precision from repeated measurements cannot rescue a poorly chosen reference.
Try it here · Checkpoint 1 of 3
Make your prediction before reading the choices. A first attempt is just a starting point.
Case 1
Show answer and explanations for case 1
A. Right posterior innominate rotation (Why this does not fit)
Posterior rotation would pair a superior ASIS with an inferior PSIS.
B. Right superior pubic shear alone (Why this does not fit)
An isolated pubic finding does not account for both iliac spines being superior.
C. Right outflare alone (Why this does not fit)
Outflare concerns distance from the midline, not this vertical pattern.
D. Right superior innominate shear (Best answer)
Concordant superior landmarks across the same innominate support the traditional superior shear pattern.
Takeaway: Compare several landmarks before naming a whole-innominate pattern.
First compare ASIS height with PSIS height. Matching vertical directions suggest a shear pattern. Opposing directions suggest rotation. Next determine whether the pubic and ischial findings support a whole-innominate description or whether the useful finding is confined to the pubic region. Motion restriction should agree with the position being named. [1][2]
Traditional ipsilateral landmark relationships
Pattern
ASIS
PSIS
Additional comparison
PatternSuperior innominate shear
ASISSuperior
PSISSuperior
Additional comparisonPubic and ischial landmarks also tend superior
PatternInferior innominate shear
ASISInferior
PSISInferior
Additional comparisonPubic and ischial landmarks also tend inferior
PatternAnterior rotation
ASISInferior
PSISSuperior
Additional comparisonRestriction of posterior rotation
PatternPosterior rotation
ASISSuperior
PSISInferior
Additional comparisonRestriction of anterior rotation
PatternIsolated pubic shear
ASISApproximately level
PSISApproximately level
Additional comparisonOne pubic tubercle is relatively superior or inferior
The malleoli are a secondary comparison. A superior innominate pattern may accompany an apparently short leg; an inferior pattern may accompany an apparently long leg. Hip rotation, knee position, pelvic orientation, and structural limb differences can change that appearance. A supine ankle check neither proves a short femur nor measures sacroiliac translation. Evaluate suspected structural discrepancy with an appropriate standing assessment and, when necessary, dedicated measurement. A heel lift should address a confirmed clinically relevant problem. [5]
Mechanism raises possibilities without assigning the label. Landing on one leg may produce an axial load, but severe post-traumatic pain requires an injury assessment. Conversely, a quiet history does not make every small asymmetry symptomatic. Record what is reproducible and what is uncertain.
Use a different comparison for flares
Flares describe transverse relationships around a vertical axis. For an inflare, the affected ASIS is relatively medial and the PSIS relatively lateral. For an outflare, the ASIS is relatively lateral and the PSIS relatively medial. The restricted direction is opposite the named position. Vertical height differences belong to a separate assessment. [1][2]
Inflare
Front landmark toward the midline. Back landmark away from the midline. Lateral ASIS excursion is restricted.
Outflare
Front landmark away from the midline. Back landmark toward the midline. Medial ASIS excursion is restricted.
Use an anatomical midline that can be reproduced. The umbilicus is a convenient visible landmark but can be off-center, especially with scars or altered abdominal contour. A short ASIS-to-umbilicus distance alone is insufficient. Repeat the comparison after checking positioning and confirm the transverse restriction. Do not equate an externally rotated foot with an outflare; the hip and lower limb have their own reasons for rotational asymmetry.
A flare can coexist with a rotation or shear. For example, an inferior ASIS and superior PSIS support anterior rotation, while a medial ASIS may add an inflare component. Document both planes if supported. After treating one component, repeat the examination before deciding that the other still warrants treatment. A memorized universal order cannot account for pain, tissue tolerance, or findings that change during care.
Separate a screening result from a pain diagnosis
The standing flexion test traditionally supports innominate laterality when one PSIS shows greater superior excursion. ASIS compression is another motion assessment used in this examination. Neither result distinguishes all shears, flares, and rotations by itself. The seated flexion test is used in a sacral assessment, but a negative result does not exclude bilateral sacral findings, fracture, infection, or all sacroiliac pain. [2][7]
Palpatory agreement is imperfect. In a primary study of osteopathy students, sacral tests had limited interexaminer reliability. That student sacral study does not directly quantify the accuracy or reliability of innominate diagnoses. This does not mean every finding is meaningless; it means that a subtle asymmetry should not carry more diagnostic certainty than the method supports. Reproducibility, motion, tenderness, neurological examination, and the patient’s functional complaint all affect interpretation. [4]
Severe pain after a fall, inability to bear weight, marked postpartum symphyseal pain, or acute pain in someone with fragility risk calls for structural injury evaluation. New bladder dysfunction, saddle sensory loss, progressive weakness, systemic illness, or a concerning cancer history redirects the examination toward the appropriate urgent pathway. A plausible pelvic pattern does not neutralize those findings. [6][9][10]
In a stable patient, define a useful baseline such as pain while rising from a chair, turning in bed, or walking a usual distance. This gives reassessment a clinical purpose. Landmark symmetry alone is a poor reason to keep treating an otherwise improving person.
Try it here · Checkpoint 2 of 3
Make your prediction before reading the choices. A first attempt is just a starting point.
Case 11
Show answer and explanations for case 11
A. A sacral rotation to the left, diagnosed from the standing test (Why this does not fit)
In the direct isometric muscle energy methods described here, the clinician first engages a comfortable restrictive barrier. The patient then supplies a gentle effort toward ease against equal counterforce. After a brief contraction, allow complete relaxation before engaging a new barrier. The intended contraction does not produce gross joint excursion. Force sufficient to trigger guarding defeats localization. These are supervised clinical techniques, selected after examination and consent. [3]
For anterior innominate rotation, the cited supine method flexes the affected hip and knee toward the posterior-rotation barrier while stabilizing the opposite pelvis; the patient gently attempts hip extension against resistance. For posterior rotation, supported hip extension toward the anterior-rotation barrier is paired with resisted hip flexion. After each effort, allow relaxation before gently taking up the new barrier. Keep the monitored pelvic response and patient tolerance central to either setup. [3]
For the taught inflare method, the patient lies supine with hip and knee partly flexed and foot supported. Stabilize the opposite ASIS, guide the thigh into abduction to the first barrier, and ask for gentle adduction against resistance. For outflare, guide the thigh into adduction while monitoring the affected posterior pelvic contact; the patient supplies resisted abduction. A brief effort of approximately three to five seconds, followed by relaxation and a new comfortable barrier, is a common teaching sequence. The setup and the active effort point in different directions.
Direction-specific pubic methods also differ. For a superior pubic shear, the affected thigh is abducted and extended to a tolerated barrier while the opposite pelvis is stabilized; hip flexion provides the resisted effort. For an inferior pubic shear, flexion and abduction provide the setup, with a monitored pelvic and ischial contact and resisted hip extension. Bilateral alternating abductor and adductor efforts address pubic compression and are not a unique superior-shear prescription. An audible articulation is not a required outcome. [3]
Whole-innominate shears require their own localization. The direct barrier for a superior pattern is inferior; for an inferior pattern it is superior. Do not translate that principle into an automatic long-axis thrust, maximal pull, or hopping instruction. Technique descriptions vary, and selection depends on risk, training, and tolerance. An indirect balanced ligamentous tension approach can explore ease in translation, rotation, and flare without forcing a painful barrier. It remains a treatment requiring examination, consent, and reassessment. [8]
Keep the result larger than the landmark
Repeat the relevant height or transverse comparison under similar conditions, retest the restricted motion, and return to the patient’s functional task. Improvement supports the usefulness of the intervention; it does not prove that a bone was displaced and reduced. Residual asymmetry can reflect anatomy or measurement variability. Likewise, no improvement does not prove that more force is needed.
Persistent symptoms require a fresh differential, including lumbar, hip, sacroiliac, pelvic ring, and nonmusculoskeletal causes as appropriate. If symptoms recur with a particular sitting posture, trial a comfortable alternative and graded activity. Explain the observation without claiming that crossed legs inevitably create an outflare. A treatment plan should build tolerance for daily activity and respond to the patient’s course. [5][6]
Suspected fracture, instability, infection, a tissue tear, or unsafe positioning changes the treatment decision. Muscle energy still loads tissue and is not risk-free simply because the patient contributes force. When the examination cannot justify a specific pattern, document the uncertainty and treat the established problem rather than the label.
Try it here · Checkpoint 3 of 3
Make your prediction before reading the choices. A first attempt is just a starting point.
Case 23
Show answer and explanations for case 23
A. Use static landmark symmetry as the treatment endpoint (Why this does not fit)
This omits motion and the functional complaint; symmetry alone cannot establish a useful clinical response.
B. Repeat comparable landmarks and motion, then reassess the previously painful task (Best answer)
This checks the original physical findings and whether treatment helped the patient.
C. Record only whether the ankle heights match (Why this does not fit)
Malleoli alone miss pelvic motion and clinical response.
D. Record the presence or absence of joint cavitation (Why this does not fit)
Cavitation does not measure improvement in symptoms, motion, or the painful task.
Takeaway: Use the same examination conditions before and after treatment.
A. Gentle knee extension against resistance (Why this does not fit)
This effort chiefly recruits the knee extensors rather than the adduction effort used in the specified inflare method.
B. No active contraction for 90 seconds (Why this does not fit)
That describes a passive positional approach rather than muscle energy.
C. Gentle adduction against equal resistance (Best answer)
The patient contracts toward ease while the clinician maintains the abducted barrier position.
D. Gentle hip abduction against equal resistance (Why this does not fit)
The described method places the limb at an abduction barrier and uses resisted adduction before relaxation. Reversing the effort changes the technique.
Takeaway: Separate the clinician-established barrier from the opposite patient effort.
A. Address the restricted inferior direction with low, localized, tolerated force (Best answer)
The diagnosed ease is superior; a direct approach engages the opposite barrier while accounting for tolerance.
B. Use a long-axis thrust as the first choice because it acts inferiorly (Why this does not fit)
A force may point in the desired direction yet exceed the patient’s stated tolerance. The technique and dose must fit the assessed tissues and response.
C. Translate farther superiorly and call the method direct (Why this does not fit)
Positioning toward ease is an indirect approach.
D. Continue until static ASIS heights match, regardless of motion response (Why this does not fit)
Static symmetry alone is not an adequate treatment endpoint; monitor restriction, symptoms, and function.
Takeaway: A directional diagnosis guides the barrier, not an automatic force prescription.
A. Ask a second examiner to complete pubic palpation during the same visit (Why this does not fit)
The patient has declined this examination; changing examiners does not supply consent. Discuss acceptable alternatives and record the limitation.
B. Record normal pubic symmetry because it was not examined (Why this does not fit)
Unexamined is not normal.
C. Defer the entire assessment until pubic palpation is accepted (Why this does not fit)
Useful history and other consented examination components remain possible; the declined component should be documented rather than treated as a prerequisite for all care.
D. Respect the decision, explain what can be assessed externally, and document the limitation (Best answer)
Consent is specific to the examination; a limited assessment can still inform care without inventing findings.
Takeaway: Accurate documentation includes what was not examined.
