fibula
Enable an agent to recognise a fibula, record its anatomical context and condition, and judge which observations or actions require further evidence or specialist assessment.
Research draft, second pass
A second pass drafted this model: the structure a model of this thing needs, and what is known about it in the world. The line under this one says how the second half was obtained - researched against sources, or recalled without web access, in which case nothing here was read anywhere and every claim is a lead to verify. Unreviewed either way.
recalled by Codex without web access - no source was read
Researched by: Codex
Purpose and description
Enable an agent to recognise a fibula, record its anatomical context and condition, and judge which observations or actions require further evidence or specialist assessment.
The fibula is the lateral bone of the lower leg in humans, articulating with the tibia and talus and contributing to ankle stability and muscle attachment while bearing a relatively small share of axial load.
It can be Identify and orient a candidate fibula using documented anatomical landmarks.; Measure its length, shaft geometry and fragment displacement using stated reference points.; Map a finding to the head, neck, shaft or lateral malleolus and relate it to neighbouring structures.; Compare observations across dates while preserving side, anatomical location and measurement method.; Flag uncertain identification, disrupted continuity or altered joint relationships for appropriate expert review.; Record sampling, fixation or graft-harvest history and distinguish observed consequences from inferred ones..
Distinguishing features
In typical human anatomy, occupies the lateral side of the lower leg beside the larger, medial tibia.
Has a proximal head and neck, a slender shaft and a distal lateral malleolus; incomplete specimens require a combination of landmarks for identification.
The human distal fibula contributes the lateral boundary of the ankle mortise, whereas the tibia forms the medial malleolus.
The human proximal fibula articulates with the tibia rather than directly with the femur, distinguishing its head from a knee-bearing tibial surface.
Its identification concerns skeletal tissue or an anatomical representation, excluding the archaeological fastener also called a fibula.
Scope
+ Identification by species, side, anatomical position and completeness
+ Proximal end, shaft, distal end and their anatomical landmarks
+ Relationships with the tibia, ankle and associated attachment structures
+ Developmental maturity, anatomical variation and bone continuity
+ Observed injury, deformity, surgical alteration and specimen provenance
- Fibula meaning an ornamental brooch or clothing fastener
- Taxonomy and whole-organism characteristics of the individual bearing the bone
- The tibia, femur and patella as independently modelled bones
- Whole-knee or whole-ankle function beyond the fibula's contribution
- Muscles, ligaments, nerves and vessels except their relationships to the fibula
- Complete disease models, treatment protocols and surgical procedures
Characteristics
- Species and anatomical reference
- Organism or taxon reference; human, nonhuman or unresolved Landmarks, proportions and persistence as a separate bone vary across species.
- Laterality
- Left, right or indeterminate Supports correct anatomical matching and prevents assignment to the wrong limb.
- Represented portion
- Whole bone, proximal end, shaft, distal end or multiple fragments Determines which identification and condition judgments the available material supports.
- Bone length
- mm, with endpoints, method and completeness recorded Supports comparison while distinguishing direct measurement from reconstruction.
- Shaft geometry
- Cross-sectional dimensions in mm and angulation in degrees at specified locations Records local shape and deformity without assuming uniform geometry along the shaft.
- Skeletal maturity
- Observed proximal and distal physeal status: open, closing, closed or unassessable Helps distinguish developmental features from structural abnormalities.
- Structural continuity
- Intact, fractured, healing, surgically divided, segment absent or indeterminate Separates observed bone continuity from assumptions about function or healing.
- Tibiofibular and ankle alignment
- Position relative to tibia and talus, with assessment method and any measured displacement The significance of a fibular change depends partly on its joint relationships.
- Evidence context
- In situ anatomy, imaging, isolated specimen or reconstructed representation Determines which landmarks, attachments and condition claims can actually be assessed.
Also called
Where this came from
wikidata · CC0 1.0
Drafted structure
Bundle to layer to finding to question, as the second pass will find it: 5 bundles · 9 layers · 14 findings · 22 questions.
Identity and anatomical boundary Establishes that the subject is a fibula and identifies the organism, side and represented portion.
The name is ambiguous, and a fragment or nonhuman specimen cannot safely inherit every feature of a complete human fibula.
Referent and species
Separates anatomical identity from terminology and species assumptions.
Skeletal referent
Record the evidence that fibula denotes this anatomical bone and the basis for selecting a species reference.
- Does fibula here denote a bone, a bone representation or a clothing fastener? definition
- What specimen record or anatomical context establishes the species, and is human anatomy an explicit assumption? provenance
Side and completeness
Establishes laterality and the portions available for assessment.
Landmark-supported identification
Identify the side and bone portion from preserved landmarks, retaining uncertainty when diagnostic features are absent.
- Which features of the head, shaft or lateral malleolus support identification and laterality? definition
- Which ends or shaft segments are absent, obscured or reconstructed? boundary
Regional form and development Records fibular landmarks, geometry and maturity without confusing normal development with damage.
The head, shaft and lateral malleolus differ in shape and significance, and interpretation depends on developmental stage.
Landmarks and dimensions
Locates observations along the bone and defines reproducible measurements.
Regional geometry
Describe the proximal head and neck, shaft and distal malleolus using identified landmarks and measurement references.
- Where are the head, neck, shaft borders and lateral malleolus identifiable in the available evidence? definition
- What are the measured length and regional dimensions, and which endpoints, planes and calibration were used? measurement
Maturity and variation
Separates developmental status and anatomical variation from acquired structural change.
Developmental interpretation
Record visible physeal status and unusual morphology, with the evidence supporting any developmental interpretation.
- What is the observed status of the proximal and distal physes, and can each be assessed reliably? measurement
- What evidence distinguishes a developmental variant or species-specific form from fracture, deformity or bone loss? boundary
Articulations and attachment relations Places the fibula within its tibiofibular, ankle and soft-tissue relationships.
Fibular significance depends on joint alignment and attachment sites; isolated bone shape does not establish whole-limb stability.
Joint relationships
Assesses the proximal tibiofibular articulation and distal relationships with the tibia and talus.
Articular position
Record the fibula's position at its articulations and distinguish direct observations from conclusions about joint stability.
- How are the fibular head and distal fibula positioned relative to their neighbouring articular structures? measurement
- What additional evidence is needed before altered fibular position can be interpreted as ankle or tibiofibular instability? boundary
Attachments and neighbouring structures
Maps relevant ligament, muscle and interosseous membrane attachments and nearby structures.
Site-specific relations
Relate a fibular observation to local attachments and nearby anatomy, including the common fibular nerve near the neck in humans.
- Which ligament, tendon, muscle or interosseous membrane attachments relate to the affected fibular region? boundary
- Does involvement of the head or neck require a separate assessment of nearby nerve function or attachment integrity? action
Structural condition and intervention context Records injury, healing, alteration and evidence limits relevant to subsequent assessment.
A fibula may be intact, fractured, surgically altered or removed in part, with consequences that cannot be inferred from its label alone.
Continuity and change
Locates structural abnormalities and tracks them over time.
Localised structural status
Record discontinuity, displacement, angulation and healing observations by fibular region and examination date.
- Where is any discontinuity, and what displacement or angulation is demonstrable with the available method? measurement
- What comparable dated evidence supports a change in alignment or healing rather than a difference in projection? provenance
Alteration history and next assessment
Connects recorded intervention history to remaining anatomy and justified next steps.
Documented alterations
Distinguish fixation, resection, graft harvest and specimen preparation from unrecorded loss or damage.
- What records establish any fixation, osteotomy, resection, graft harvest or specimen preparation affecting this fibula? provenance
- Which unresolved observations require further imaging, specimen examination or specialist assessment before an intervention decision? action
Evidence and external alignment What the world already says about this thing, gathered so the model can be checked against it.
A model that cannot be lined up against existing standards, identifiers and practice cannot be adopted by anyone who already uses them.
Reported evidence
Findings from the breadth pass, kept separate from the structural claims.
Check these first
Recalled without web access and unsourced; every item is a lead to verify.
- The PHY.LIV domain supports the anatomical sense; the registry does not explicitly specify humans or another vertebrate group.
- This account uses human anatomy; fibular form, reduction and fusion vary across vertebrate groups.
- No sources were consulted; numerical dimensions and load-sharing percentages are omitted because they depend on population and measurement conditions.
- Which of these check these first hold for the sense of fibula this model covers, and on what evidence? provenance
Identifiers and schemes
Recalled without web access and unsourced; every item is a lead to verify.
- Terminologia Anatomica - fibula - The Latin anatomical name; no numerical identifier is asserted here.
- Which of these identifiers and schemes hold for the sense of fibula this model covers, and on what evidence? provenance
Standards and regulation
Recalled without web access and unsourced; every item is a lead to verify.
- Terminologia Anatomica, maintained by the Federative International Programme for Anatomical Terminology (FIPAT), standardizes anatomical nomenclature.
- Which of these standards and regulation hold for the sense of fibula this model covers, and on what evidence? provenance
Real-world use
Recalled without web access and unsourced; every item is a lead to verify.
- The distal fibula forms the lateral malleolus and helps stabilize the ankle joint.
- The shaft provides attachment sites for muscles and the interosseous membrane.
- Fibular bone can serve as a graft, including vascularized grafts used in reconstructive surgery.
- Fibular landmarks support anatomical examination and interpretation of diagnostic imaging.
- Which of these real-world use hold for the sense of fibula this model covers, and on what evidence? provenance
Failure modes and hazards
Recalled without web access and unsourced; every item is a lead to verify.
- Traumatic fractures can involve the head, shaft or lateral malleolus.
- Repetitive loading can cause stress fractures.
- Distal fibular injury with syndesmotic disruption can compromise ankle stability.
- The common fibular nerve passes close to the fibular neck and can be injured there, potentially causing foot drop.
- Fracture malalignment or shortening can alter ankle mechanics.
- Which of these failure modes and hazards hold for the sense of fibula this model covers, and on what evidence? provenance
Neighbouring kinds and how to tell them apart
Recalled without web access and unsourced; every item is a lead to verify.
- tibia - The tibia is the larger, medial lower-leg bone and the principal weight-bearing connection between the knee and ankle.
- talus - The talus is a tarsal bone of the foot that articulates with the distal tibia and fibula.
- lateral malleolus - The lateral malleolus is the distal projection of the fibula, not a separate bone.
- fibula (brooch) - The archaeological sense denotes a fastening device for clothing rather than an anatomical structure.
- Which of these neighbouring kinds and how to tell them apart hold for the sense of fibula this model covers, and on what evidence? provenance
What the second pass must settle
- Does the registry intend the human fibula specifically or the homologous skeletal element across vertebrates?
- Which authoritative anatomical references should govern species-specific landmarks, terminology and identification criteria?
- Which measurement protocols and reference populations are appropriate for fibular dimensions and developmental interpretation?
- How should the model represent a harvested fibular segment after transplantation while preserving its anatomical origin and current role?
- Which validated assessment frameworks should support judgments about fracture healing and associated ankle stability?