PRI · Pelvis

Pelvis Restoration exam preparation.

Anatomy Anatomize This identification game, pelvis decoder, L AIC chain diagram. Nomenclature Pelvic joints, PRI-to-standard translation table. Patterns L AIC, B PEC, Patho PEC comparison. Test profiles. Concept map. Diagnose This Decision tree, causal chains, case studies, exercise map. Flashcards Pre-loaded deck. Tests, concepts, initialisms, muscles, treatment. Equivalence Interactive quiz mapping inlet, outlet, and femoral positions. Master Quiz 175 questions across all domains. Missed-question prioritization.
A Note on PRI Nomenclature

Joints are passive structures. They permit motion; they do not produce it. Muscles produce motion. At any joint, both bones move relative to each other — which one moves more depends on loading, not on the joint itself. There is no inherent "mover" and "fixed bone."

PRI's naming system departs from this. Each acronym (IS, SI, IP, IsP, AF, FA) names a joint by putting one bone first — declaring it the reference point for treatment. IS and SI are the same sacroiliac joint. AF and FA are the same hip joint. The first letter tells you which bone PRI wants you to influence; the second letter is the bone it moves relative to. IR/ER names the direction.

This is treatment-planning shorthand, not biomechanical description. The acronyms encode three things in one label: anatomy (which bones), a clinical frame (which muscle group to facilitate), and position (IR or ER). If you read them as literal mechanics — one bone moves, the other stays put — they will not make sense, because that is not how joints work.

The Translation Table maps every PRI term to its standard anatomical equivalent with this logic explained.

Side
Region
Direction
ASIS Sacral base Pubic symphysis Acetabulum Ischial tub. Coccyx ASIS drops forward ASIS rises backward (inlet ring) (outlet ring)
Inlet direction matches femur direction. Outlet direction is always opposite.

L AIC Chain

Left Anterior Interior Chain

Pelvic Joints

The pelvis contains five joints. PRI's position-naming system references three of them — the sacroiliac joint, the pubic symphysis, and the hip joint. The other two (lumbosacral and sacrococcygeal) are anatomically present but excluded from PRI's framework because they do not involve innominate displacement.

JointTypeMotionPRI PositionsPRI Role

PRI's 12 position codes reference exactly 3 joints. The naming convention encodes which bone is displaced and which to target — not the joint itself. IS and SI are the same physical joint (sacroiliac). AF and FA are the same physical joint (hip). IP and IsP reference the same landmark (pubic symphysis). Six joint names, three anatomical structures.

SACRUM L ILIUM R ILIUM SI joint surfaces highlighted Schematic — not anatomically proportional

Sacroiliac joint

PELVIS fem. head FEMUR acetabulum highlighted

Hip joint (acetabulofemoral)

Translation Table

Reading PRI acronyms: the first letter names the bone PRI considers the reference point for treatment. The second letter names the bone it moves relative to. IR/ER names the direction.

AcronymDecodeMeaning
ISIlio-SacralIlium relative to sacrum — posterior inlet. Target: muscles that move the ilium.
SISacro-IliacSacrum relative to ilium — posterior outlet. Same joint as IS. Target: muscles that move the sacrum.
IPIlio-PuboIlium relative to pubic symphysis — anterior inlet. Target: muscles that tilt the ilium.
IsPIschio-PuboIschium relative to pubic symphysis — anterior outlet. Target: muscles that move the ischium.
AFAcetabulo-FemoralPelvis on femur — closed chain (stance leg). Target: reposition pelvis over planted femur.
FAFemoro-AcetabularFemur on pelvis — open chain (swing leg). Target: mobilize femur in the socket.
AcronymIS
DecodeIlio-Sacral
MeaningIlium relative to sacrum — posterior inlet. Target: muscles that move the ilium.
AcronymSI
DecodeSacro-Iliac
MeaningSacrum relative to ilium — posterior outlet. Same joint as IS. Target: muscles that move the sacrum.
AcronymIP
DecodeIlio-Pubo
MeaningIlium relative to pubic symphysis — anterior inlet. Target: muscles that tilt the ilium.
AcronymIsP
DecodeIschio-Pubo
MeaningIschium relative to pubic symphysis — anterior outlet. Target: muscles that move the ischium.
AcronymAF
DecodeAcetabulo-Femoral
MeaningPelvis on femur — closed chain (stance leg). Target: reposition pelvis over planted femur.
AcronymFA
DecodeFemoro-Acetabular
MeaningFemur on pelvis — open chain (swing leg). Target: mobilize femur in the socket.

These are treatment-planning codes, not anatomical terms. The same physical joint gets two names to encode which muscle group to facilitate.

PRI creates new joint names to encode treatment targets. IS vs. SI is the same sacroiliac joint — the name tells you which bone PRI considers displaced. IP and IsP describe innominate movement relative to the pubic symphysis — a real joint (amphiarthrosis) with minimal motion that PRI uses as a positional reference, not a treatment target.

Translation Breakdown

PRI TermReal StructureWhat PRI Renamed What Actually HappenedStandard TermEncoded Treatment Target

Pattern Comparison Cheat Sheet

= — differentiating tests between patterns.

Concept Map

Click a node to highlight its connections.

Symptom-to-Pattern Matching

Score: 0 / 0
Clinical Condition

Test Reference

Test Profile by Pattern

Test Left AIC Bilateral PEC B Patho PEC
ADT+ Left only+ Bilateral+ Bilateral
PADT+ Left only+ Bilateral+ Bilateral
PART+ Right− Bilateral+ Bilateral or unilateral
SRT> 0" (L hip shift)> 0" (can't touch toes)= 0" (touches toes)
Squat< 3/5< 3/5> 3/5
HALTR 0-4/5Low bilaterallyLow bilaterally
Patho tells: Three distinguishers from B PEC: (1) PART positive, (2) SRT = 0 / touches toes, (3) Squat > 3/5. Better ROM = worse pathology.

HALT Level Quiz

Squat Level Quiz

Pattern Identifier

Case Studies

Causal Chains

Drag (or tap) to reorder the steps in each causal chain. Click "Check" when done.

Decision Tree

Muscle-to-Exercise Map

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  • By Finding
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    Flashcards

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    Equivalence Quiz

    Inlet direction matches femur direction. Outlet direction is always opposite.
    Master Rule:
    L IP ER = L IS IR = L IsP IR = L SI IR = L AF ER
    Inverse: L IP IR = L IS ER = L IsP ER = L SI ER = L AF IR

    Results

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    Master Quiz

    Domains

    Questions

    Question 1 of 25

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