Judet-Letournel

classification of acetabular fractures

Per-hemipelvis acetabular fracture classification into five elementary and five associated patterns using column, wall and transverse-component anatomy on pelvic radiographs and CT; the pattern supports approach planning but does not encode hip stability or operative indication by itself.

vigenteJudet, Judet & Letournel1964 / 1980 ten-pattern refinement1964XR, CT

Fonte primária 10 categorias

ant-wallAnterior wall (elementary)post-wallPosterior wall (elementary)ant-columnAnterior column (elementary)post-columnPosterior column (elementary)transverseTransverse (elementary)post-column-wallPosterior column with posterior wall (associated)transverse-wallTransverse with posterior wall (associated)t-shapedT-shaped (associated)ant-column-post-hemitransverseAnterior column with posterior hemitransverse (associated)both-columnAssociated both-column (associated)

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Categorias

Reescritas a partir da fonte e citadas

ant-wall

1 de 10

Anterior wall (elementary)

Elementary anterior-wall fracture: an independent anterior acetabular rim or wall fragment is present without complete separation of the anterior column. Confirm the wall fragment in more than one plane and account for the remaining column continuity.

CondutaThe pattern identifies anterior articular exposure as the planning problem; an anterior approach is a historical option when fixation is indicated. Operative need and the exact approach still depend on displacement, congruence, dome involvement, stability and patient factors.

RiscoThe label does not quantify outcome or hip stability. Prognosis depends more directly on articular displacement and reduction, marginal impaction, comminution, femoral-head injury, intra-articular fragments and age than on the wall label alone.

verificadoClassifications in Brief: Letournel Classification for Acetabular FracturesAlton and Gee 2014, History/Purpose and Fig. 1 list anterior wall among the five elementary patterns; Purpose and Limitations address approach planning, stability and outcome modifiers. Gansslen et al. 2024, AP wall-line and Judet-view analysis.

post-wall

2 de 10

Posterior wall (elementary)

Elementary posterior-wall fracture: an independent posterior acetabular wall fragment is present while the posterior column remains continuous. Distinguish a true isolated wall fragment from posterior-wall involvement within an associated pattern.

CondutaA posterior exposure is the classic approach family when fixation is required, but the code alone cannot decide surgery. Report fragment size, displacement, marginal impaction, posterior hip dislocation and stability assessment because stable and unstable posterior-wall injuries occur.

RiscoPosterior-wall size, capsular integrity, comminution, hip stability and femoral-head injury influence outcome; the Letournel label supplies no individual probability. The review explicitly notes that the classification does not encode stability.

verificadoClassifications in Brief: Letournel Classification for Acetabular FracturesAlton and Gee 2014, Fig. 1 and Purpose identify the elementary posterior-wall pattern and posterior approach context; Limitations discusses variable wall size, capsular injury, stability, comminution and femoral-head injury. Gansslen et al. 2024, posterior-wall fragment branch.

ant-column

3 de 10

Anterior column (elementary)

Elementary anterior-column fracture: the anterior column is separated along a variable high-to-low course that can extend from the iliac wing or pelvic brim through the acetabulum toward the obturator ring or ischiopubic segment; the iliopectineal line is disrupted.

CondutaThe pattern generally directs planning toward anterior-column access when operative reduction is indicated. Preserve the fracture height and displacement because they affect exposure; do not infer an operation solely from the anterior-column label.

RiscoThis is an anatomic pattern rather than a calibrated severity category. Joint congruence, dome involvement, impaction, comminution, intra-articular fragments, associated injuries and quality of reduction drive risk more than the label alone.

verificadoClassifications in Brief: Letournel Classification for Acetabular FracturesAlton and Gee 2014, Fig. 1, Purpose and Conclusions identify anterior column as elementary and link pattern to approach planning. Gansslen et al. 2024, iliopectineal-line, iliac-wing, inferior-ramus and CT column analysis sections.

post-column

4 de 10

Posterior column (elementary)

Elementary posterior-column fracture: the posterior column is separated, classically along a course from the greater sciatic-notch region through the acetabulum to the obturator or ischiopubic segment; the ilioischial line is disrupted without a separate posterior-wall component.

CondutaA posterior approach family is classically used when operative fixation is selected. The report must still state displacement, joint congruence, sciatic-notch extension, wall integrity and intra-articular injury because the pattern does not itself establish operative indication.

RiscoThe category does not provide a pattern-specific probability of arthritis, nerve injury or arthroplasty. Initial displacement, articular reduction, impaction, comminution, femoral-head injury, fragments and patient factors remain the major reported outcome drivers.

verificadoClassifications in Brief: Letournel Classification for Acetabular FracturesAlton and Gee 2014, Fig. 1 and Purpose identify posterior column as elementary and describe posterior approach context; Limitations lists prognostic modifiers. Gansslen et al. 2024, ilioischial-line and CT column-separation analysis.

transverse

5 de 10

Transverse (elementary)

Elementary transverse fracture: one transverse component crosses both columns and separates an inferior ischiopubic segment from a superior iliac segment whose acetabular roof remains attached to the sacroiliac joint. Record the infratectal, juxtatectal or transtectal level.

CondutaAnterior, posterior or combined access may be considered depending on fracture level, direction of displacement, hip dislocation and reducibility. The code informs approach planning but does not decide treatment; weight-bearing dome involvement and congruence must be reported.

RiscoA higher transverse level can involve more of the weight-bearing dome, but no per-level probability is encoded. Long-term outcome is strongly linked to articular congruence and reduction plus impaction, comminution and joint injury rather than the word transverse alone.

verificadoClassifications in Brief: Letournel Classification for Acetabular FracturesAlton and Gee 2014, Fig. 1, Purpose and approach discussion identify the transverse elementary pattern and variable approach options; Limitations covers outcome modifiers. Gansslen et al. 2024, axial-CT transverse-component and algorithm sections.

post-column-wall

6 de 10

Posterior column with posterior wall (associated)

Associated posterior-column plus posterior-wall fracture: a complete posterior-column separation coexists with an independent posterior-wall fragment. Both components must be demonstrated; a disrupted wall line alone is insufficient.

CondutaThe combined posterior column and wall anatomy commonly makes posterior access relevant when fixation is indicated. Planning must additionally address wall-fragment stability, marginal impaction, column displacement, hip dislocation and femoral-head or intra-articular injury.

RiscoAssociated patterns can have worse outcomes, but this label is not a numeric prognosis. Wall comminution, femoral-head injury, instability, initial displacement and final reduction quality must be reported to characterize risk.

verificadoClassifications in Brief: Letournel Classification for Acetabular FracturesAlton and Gee 2014, Fig. 1 lists posterior column with posterior wall among the five associated patterns; Purpose and Limitations address approach and prognostic factors. Gansslen et al. 2024, posterior-wall-fragment branch separating PC/W from isolated posterior column.

transverse-wall

7 de 10

Transverse with posterior wall (associated)

Associated transverse plus posterior-wall fracture: a transverse component crosses both columns and an independent posterior-wall fragment is also present. Preserve the transverse roof level and the wall-fragment size, displacement and impaction.

CondutaThe transverse component and posterior wall may require posterior, anterior or combined access depending on displacement and reducibility. The pattern is an approach-planning input, not an automatic indication; assess hip stability, congruence and incarcerated fragments separately.

RiscoRisk is not calibrated by this label. Posterior-wall instability or comminution, dome involvement, femoral-head injury, intra-articular fragments, delay and quality of reduction materially affect outcome.

verificadoClassifications in Brief: Letournel Classification for Acetabular FracturesAlton and Gee 2014, Fig. 1 and Purpose list transverse with posterior wall as associated and describe variable approaches; Limitations lists stability and outcome factors. Gansslen et al. 2024, posterior-wall branch separating TPW from pure transverse.

t-shaped

8 de 10

T-shaped (associated)

Associated T-shaped fracture: a transverse component is joined by a distal vertical stem that separates the anterior and posterior columns below the acetabulum, typically extending into the obturator ring or ischiopubic segment.

CondutaApproach selection is variable and may require anterior, posterior or combined access according to displacement of each limb and surgeon expertise. Map both the transverse bar and inferior stem before planning; the T-shaped code alone does not mandate a procedure.

RiscoThe associated topology denotes complexity but is not an ordinal risk score. Dome involvement, fragment displacement, impaction, comminution, joint contents and achievable articular reduction determine prognosis more directly.

verificadoClassifications in Brief: Letournel Classification for Acetabular FracturesAlton and Gee 2014, Fig. 1 and Purpose identify T-shaped as an associated pattern with variable approach options. Gansslen et al. 2024, CT analysis and Fig. 6 describe the transverse component plus distal column separation and note classification difficulty.

ant-column-post-hemitransverse

9 de 10

Anterior column with posterior hemitransverse (associated)

Associated anterior-column plus posterior-hemitransverse fracture: a complete anterior-column component coexists with a transverse fracture limited to the posterior acetabulum, while some articular roof remains attached to the stable posterior ilium and sacroiliac joint.

CondutaAnterior-column access is commonly relevant when fixation is indicated, with additional planning for the posterior hemitransverse component. Confirm displacement and reducibility of both components; do not equate this pattern with both-column or choose an approach from the label alone.

RiscoThe label does not quantify prognosis. Outcome depends on articular displacement and reduction, impaction, comminution, intra-articular fragments, femoral-head injury and patient factors; retained roof attachment distinguishes topology, not safety.

verificadoClassifications in Brief: Letournel Classification for Acetabular FracturesAlton and Gee 2014, Fig. 1 and Purpose list anterior column with posterior hemitransverse and anterior approach context. Gansslen et al. 2024, CT definitions distinguish ACPHT by posterior-only transverse component and retained articular attachment to the SI joint.

both-column

10 de 10

Associated both-column (associated)

Associated both-column fracture: the anterior and posterior columns and every acetabular articular segment are disconnected from the stable posterior ilium and sacroiliac joint, producing a floating acetabulum; the spur sign supports this complete articular dissociation.

CondutaReconstruction may require anterior, posterior or combined strategies based on the dominant displacement and accessible reduction pathway. Confirm that no articular roof remains attached to the sacroiliac joint and map all fragments; the code alone does not select surgery or approach.

RiscoComplete articular dissociation is complex, yet the label is not a patient-specific forecast. Initial displacement, marginal impaction, comminution, intra-articular fragments, femoral-head injury, age, timing and final reduction quality govern outcome.

verificadoClassifications in Brief: Letournel Classification for Acetabular FracturesAlton and Gee 2014, Fig. 1, Purpose and Limitations identify both-column as associated and describe approach and outcome constraints. Gansslen et al. 2024, CT analysis and algorithm define no articular fragment attached to the SI joint and the spur sign distinction from ACPHT.

Lógica de decisão estruturada

Trace the entire fracture through the columns, walls, transverse component and stable posterior ilium. Return uncertainty when attachment or extension is unresolved, and keep pattern classification separate from stability, prognosis and treatment selection.

{
  "categories": [
    {
      "outcome_code": "ant-wall",
      "group": "elementary",
      "pattern": "isolated_anterior_acetabular_wall_fragment",
      "column_continuity": "no_complete_anterior_column_separation"
    },
    {
      "outcome_code": "post-wall",
      "group": "elementary",
      "pattern": "isolated_posterior_acetabular_wall_fragment",
      "column_continuity": "posterior_column_remains_continuous"
    },
    {
      "outcome_code": "ant-column",
      "group": "elementary",
      "pattern": "anterior_column_separated_from_remaining_innominate_bone",
      "common_course": "variable_level_iliac_or_pelvic_brim_to_acetabulum_and_obturator_ring"
    },
    {
      "outcome_code": "post-column",
      "group": "elementary",
      "pattern": "posterior_column_separated",
      "common_course": "greater_sciatic_notch_through_acetabulum_to_obturator_ring_or_ischiopubic_segment"
    },
    {
      "outcome_code": "transverse",
      "group": "elementary",
      "pattern": "single_transverse_component_crosses_both_columns",
      "superior_articular_attachment": "retained_to_sacroiliac_joint",
      "sublevels": [
        "infratectal",
        "juxtatectal",
        "transtectal"
      ]
    },
    {
      "outcome_code": "post-column-wall",
      "group": "associated",
      "pattern": "posterior_column_fracture_plus_independent_posterior_wall_fragment"
    },
    {
      "outcome_code": "transverse-wall",
      "group": "associated",
      "pattern": "transverse_fracture_plus_independent_posterior_wall_fragment"
    },
    {
      "outcome_code": "t-shaped",
      "group": "associated",
      "pattern": "transverse_component_plus_distal_vertical_stem_separating_anterior_and_posterior_columns",
      "inferior_extension": "obturator_ring_or_ischiopubic_segment"
    },
    {
      "outcome_code": "ant-column-post-hemitransverse",
      "group": "associated",
      "pattern": "anterior_column_fracture_plus_posterior_hemitransverse_component",
      "superior_articular_attachment": "some_roof_remains_attached_to_sacroiliac_joint"
    },
    {
      "outcome_code": "both-column",
      "group": "associated",
      "pattern": "complete_separation_of_both_columns_and_all_articular_segments_from_stable_posterior_ilium",
      "radiographic_key": "spur_sign"
    }
  ],
  "applicability": {
    "use_for": "Preoperative anatomic description of an acute acetabular fracture, one injured hemipelvis at a time.",
    "classification_unit": "one_fractured_acetabulum",
    "required_inputs": [
      "side",
      "AP_pelvis",
      "thin_section_CT_with_multiplanar_reformations",
      "anterior_and_posterior_column_continuity",
      "anterior_and_posterior_wall_fragments",
      "transverse_component",
      "obturator_ring_or_inferior_ramus_extension",
      "articular_attachment_to_sacroiliac_joint"
    ],
    "useful_additions": [
      "iliac_and_obturator_oblique_Judet_views",
      "3D_CT_with_femoral_head_subtracted",
      "post_reduction_imaging_when_hip_dislocation_was_present"
    ],
    "outside_scope": [
      "pelvic_ring_classification",
      "periprosthetic_acetabular_fracture",
      "pathologic_fracture_staging",
      "hip_stability_determination",
      "operative_indication_without_displacement_congruence_and_patient_context"
    ]
  },
  "imaging_and_quality_gate": {
    "radiographic_set": "Use the AP pelvis and, when available, 45-degree iliac and obturator oblique views; the iliac oblique profiles the posterior column and anterior wall, while the obturator oblique profiles the anterior column and posterior wall.",
    "CT_rule": "Review the complete axial dataset with coronal and sagittal reformations. CT is required to define complex fracture topology and to search for marginal impaction, comminution, intra-articular fragments and femoral-head injury.",
    "three_dimensional_rule": "A 3D reconstruction can improve orientation and teaching but must not replace source images, because reduction, impacted fragments and joint contents can be obscured.",
    "inadequacy_rule": "If column attachment, transverse extension or the obturator segment cannot be followed across contiguous images, return the unresolved competing patterns instead of assigning a definitive type from a single slice."
  },
  "landmark_model": {
    "AP_pelvis": [
      {
        "landmark": "iliopectineal_line",
        "represents": "medial_anterior_column",
        "disruption_supports": "anterior_column_involvement"
      },
      {
        "landmark": "ilioischial_line",
        "represents": "middle_and_lower_posterior_column",
        "disruption_supports": "posterior_column_involvement"
      },
      {
        "landmark": "anterior_wall_line",
        "represents": "anterior_acetabular_wall",
        "warning": "line_disruption_does_not_alone_prove_an_isolated_ant-wall_pattern"
      },
      {
        "landmark": "posterior_wall_line",
        "represents": "posterior_acetabular_wall",
        "warning": "line_disruption_does_not_alone_prove_an_isolated_post-wall_pattern"
      },
      {
        "landmark": "acetabular_roof",
        "represents": "major_weight_bearing_region"
      },
      {
        "landmark": "teardrop",
        "represents": "acetabular_fossa_and_distal_quadrilateral_surface_projection"
      }
    ],
    "additional_discriminators": [
      "iliac_wing_fracture",
      "inferior_pubic_ramus_or_obturator_ring_fracture",
      "independent_posterior_wall_fragment",
      "transverse_component",
      "spur_sign",
      "articular_fragment_attached_to_SI_joint"
    ],
    "CT_orientation": "On axial CT, a horizontal-appearing line separates a column, whereas a vertical-appearing line through the acetabulum supports a transverse component; follow every line through contiguous planes before naming the pattern."
  },
  "stepwise_classification": [
    "confirm_that_the_injury_is_acetabular_and_record_side_and_hip_dislocation_status",
    "trace_the_iliopectineal_and_ilioischial_lines_and_confirm_column_continuity_on_CT",
    "identify_independent_anterior_or_posterior_wall_fragments",
    "identify_a_transverse_component_through_both_columns_and_record_its_roof_level",
    "check_the_obturator_ring_and_inferior_ramus_for_a_distal_column_separation",
    "check_the_iliac_wing_and_whether_any_articular_roof_remains_attached_to_the_sacroiliac_joint",
    "use_the_spur_sign_and_CT_attachment_test_to_separate_both-column_from_ant-column-post-hemitransverse",
    "select_one_of_the_five_elementary_or_five_associated_patterns_only_after_the_entire_fracture_course_is_accounted_for"
  ],
  "high_value_branch_rules": [
    {
      "if": "independent_posterior_wall_fragment_without_column_or_transverse_component",
      "output_code": "post-wall"
    },
    {
      "if": "posterior_column_separation_plus_independent_posterior_wall_fragment",
      "output_code": "post-column-wall"
    },
    {
      "if": "transverse_component_plus_independent_posterior_wall_fragment",
      "output_code": "transverse-wall"
    },
    {
      "if": "pure_transverse_component_with_obturator_ring_intact_and_roof_attached_to_SI_joint",
      "output_code": "transverse"
    },
    {
      "if": "transverse_component_plus_distal_column_split_into_obturator_or_ischiopubic_segment",
      "output_code": "t-shaped"
    },
    {
      "if": "anterior_column_separation_plus_posterior_hemitransverse_component_and_articular_roof_still_attached_to_SI_joint",
      "output_code": "ant-column-post-hemitransverse"
    },
    {
      "if": "both_columns_separated_and_no_articular_surface_remains_attached_to_SI_joint_with_or_without_spur_sign",
      "output_code": "both-column"
    }
  ],
  "critical_distinctions": {
    "wall_versus_column": "A wall fracture isolates an articular rim segment while the corresponding column remains continuous; a column fracture separates the full column segment.",
    "transverse_versus_both_column": "A transverse fracture leaves the superior acetabular roof attached to the posterior ilium and SI joint; a both-column fracture disconnects every articular segment from the axial skeleton.",
    "t_shaped_versus_transverse": "The T-shaped pattern adds a distal vertical stem that separates the anterior and posterior columns below the transverse component and usually disrupts the obturator ring or ischiopubic segment.",
    "both_column_versus_ACPHT": "No articular roof attached to the SI joint and a spur sign support both-column; retained articular attachment supports ant-column-post-hemitransverse.",
    "spectrum_rule": "Incomplete, transitional and combined fracture lines occur. If the fracture does not fully satisfy one canonical pattern, report the dominant pattern plus the atypical component rather than hiding it."
  },
  "approach_planning_context": {
    "posterior_family": [
      "post-wall",
      "post-column",
      "post-column-wall"
    ],
    "anterior_family": [
      "ant-wall",
      "ant-column",
      "ant-column-post-hemitransverse"
    ],
    "variable_or_combined_family": [
      "transverse",
      "transverse-wall",
      "t-shaped",
      "both-column"
    ],
    "historical_context": "The original system was designed to make the fracture outline understandable before surgery and to support selection of an exposure; no single exposure conveniently reaches both columns.",
    "safety_rule": "The pattern suggests which surface or column must be accessed but does not by itself mandate surgery or a named approach. Direction of displacement, dome involvement, hip congruence, soft tissue, timing, patient physiology and surgeon expertise remain decisive."
  },
  "required_companion_injury_report": [
    "hip_dislocation_and_reduction_status",
    "femoral_head_subluxation_or_joint_incongruence",
    "maximum_articular_displacement_and_weight_bearing_dome_involvement",
    "posterior_wall_fragment_size_and_dynamic_stability_context_when_relevant",
    "marginal_or_subchondral_impaction",
    "comminution",
    "intra_articular_fragments",
    "femoral_head_or_neck_injury",
    "sciatic_nerve_or_neurovascular_clinical_concern",
    "associated_pelvic_ring_injury"
  ],
  "risk_model": {
    "classification_limit": "Letournel pattern alone is not a calibrated prognosis and does not encode hip stability.",
    "principal_outcome_drivers": [
      "quality_of_articular_reduction",
      "initial_displacement",
      "joint_congruence",
      "subchondral_or_marginal_impaction",
      "comminution",
      "intra_articular_fragments",
      "femoral_head_injury",
      "age",
      "delay_to_definitive_reduction"
    ],
    "historic_reduction_signal": "In the Letournel series summarized by Alton and Gee, post-traumatic arthritis was 5.4% after anatomic reduction versus 30.7% after imperfect reduction; this is a historical cohort association, not a per-pattern patient probability.",
    "nonordinal_rule": "The ten labels are anatomic patterns, not a severity ladder. An associated label is not automatically a treatment or outcome score."
  },
  "output_contract": [
    "injured_side_and_hip_dislocation_status",
    "imaging_set_and_technical_adequacy",
    "anterior_and_posterior_column_continuity",
    "anterior_and_posterior_wall_fragments",
    "transverse_component_and_roof_level",
    "obturator_ring_inferior_ramus_and_iliac_wing_extension",
    "articular_attachment_to_SI_joint_and_spur_sign",
    "single_best_Judet_Letournel_code_or_named_competing_patterns",
    "displacement_congruence_impaction_comminution_and_joint_fragments",
    "approach_planning_relevance_without_autonomous_treatment"
  ],
  "missing_input_behavior": [
    "If only an AP radiograph is available and the full fracture course is unresolved, return a provisional column-wall description and request CT rather than forcing one of ten patterns.",
    "If no independent posterior wall fragment can be confirmed, do not append a posterior-wall component solely because the posterior wall line is interrupted.",
    "If the inferior stem or obturator-ring extension is unknown, do not distinguish pure transverse from T-shaped with confidence.",
    "If SI-joint articular attachment and the spur sign are unresolved, do not distinguish both-column from ant-column-post-hemitransverse with confidence.",
    "If the fracture is transitional, retain every observed component and flag specialist review instead of choosing the nearest label silently."
  ],
  "interpretation_limits": [
    "The classification describes fracture topology and aids approach planning; it does not determine hip stability, urgency after dislocation, operative indication or rehabilitation.",
    "Pattern recognition remains experience-dependent. CT improves anatomic understanding but does not eliminate transitional forms or reader disagreement.",
    "Pelvic-ring fractures and associated injuries require their own description or classification and must not be collapsed into the acetabular code."
  ],
  "source_locator": "Judet, Judet and Letournel, JBJS 1964;46:1615-1646, PMID 14239854, DOI 10.2106/00004623-196446080-00001; Letournel, Clin Orthop Relat Res 1980;(151):81-106, PMID 7418327, ten-pattern refinement and approach purpose; Alton and Gee, Clin Orthop Relat Res 2014;472:35-38, DOI 10.1007/s11999-013-3375-y, History, Purpose, Limitations and Conclusions; Gansslen et al., Arch Orthop Trauma Surg 2024;144:4655-4665, DOI 10.1007/s00402-024-05599-6, radiographic lines, CT analysis and proposed algorithm."
}

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