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.

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.

Joint	Type	Motion	PRI Positions	PRI 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.

Sacroiliac joint

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.

Acronym	Decode	Meaning
IS	Ilio-Sacral	Ilium relative to sacrum — posterior inlet. Target: muscles that move the ilium.
SI	Sacro-Iliac	Sacrum relative to ilium — posterior outlet. Same joint as IS. Target: muscles that move the sacrum.
IP	Ilio-Pubo	Ilium relative to pubic symphysis — anterior inlet. Target: muscles that tilt the ilium.
IsP	Ischio-Pubo	Ischium relative to pubic symphysis — anterior outlet. Target: muscles that move the ischium.
AF	Acetabulo-Femoral	Pelvis on femur — closed chain (stance leg). Target: reposition pelvis over planted femur.
FA	Femoro-Acetabular	Femur 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 Term	Real Structure	What PRI Renamed	What Actually Happened	Standard Term	Encoded Treatment Target

Pattern Comparison Cheat Sheet

= — differentiating tests between patterns.

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
HALT	R 0-4/5	Low bilaterally	Low 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

Flashcards

0 of 0 remaining

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

Questions:

Question 1 of 10

Select all equivalent positions:

Results

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Master Quiz

Domains

Nomenclature Tests Treatment Anatomy Procedures Clinical

Questions

Questions:

Prioritize missed questions

Question 1 of 25

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PRI · Pelvis

Pelvic Joints

Translation Table

Translation Breakdown

Pattern Comparison Cheat Sheet

Concept Map

Symptom-to-Pattern Matching

Test Reference

Test Profile by Pattern

HALT Level Quiz

Squat Level Quiz

Pattern Identifier

Case Studies

Causal Chains

Decision Tree

Muscle-to-Exercise Map

Flashcards

New Card

Equivalence Quiz

Results

Master Quiz

Domains

Questions

Results