patellar tendon
Enable an agent to identify a patellar tendon, assess its documented structure and contribution to knee extension, and determine which observations or authorized actions its state supports.
Bundle → Layer → Finding → Questions Filled
6 bundles · 11 layers · 16 findings · 35 questions
Patellar tendon identity Establish which anatomical instance is meant and how it specializes the broader tendon concept.
Terminology and specialization
Connect the registry identity to anatomical names and inherited tendon properties.
Patellar tendon name resolution
Record naming equivalence without treating it as evidence of an additional registry entry.
- Does the source use patellar tendon, patellar ligament, or another term for the same anatomical span? definition
- Which properties are inherited from tendon, and which depend specifically on the patellar and tibial attachments? boundary
Subject and anatomical instance
Anchor every observation to one knee and its documented anatomy.
Laterality and endpoint identification
Identify the tendon through its subject, side, and attachment landmarks.
- Which subject, species, and knee does this tendon belong to? provenance
- What examination or image establishes the patellar and tibial endpoints? provenance
- Does the referenced tissue lie below the patella, or is the source actually describing the quadriceps tendon above it? boundary
Attachment and regional anatomy Describe the tendon by its two attachment interfaces and intervening substance.
Patellar and tibial interfaces
Locate observations relative to the inferior patella and tibial tuberosity.
Attachment localization
Keep tendon-side, interface, and bone-side observations distinguishable.
- Is the observation at the patellar attachment, tibial attachment, or intervening tendon? measurement
- Does it concern tendon tissue, the attachment interface, or adjacent bone requiring a linked bone record? boundary
- What landmarks and evidence establish the extent of the affected interface? provenance
Regional geometry and neighbours
Localize tendon measurements and separate adjacent tissues.
Site-specific tendon dimensions
Attach each geometric observation to a reproducible location and acquisition condition.
- At what distance from a named attachment were thickness, width, or cross-sectional area measured? measurement
- What knee angle, loading state, modality, and imaging plane were used? measurement
- How was tendon tissue distinguished from adjacent fat pad, bursa, or retinacular tissue? boundary
Extensor mechanism participation Represent the tendon's mechanical relationship to knee extension and task loading.
Extension and continuity
Connect observed tendon continuity with separately recorded extension performance.
Structural and functional correspondence
Maintain separate evidence for tendon structure and extensor-mechanism performance.
- What evidence describes continuity between the patellar and tibial attachments? provenance
- What active extension, passive extension, and extension lag were recorded under which protocol? measurement
- Which quadriceps, patellar, retinacular, or pain-related factors remain unresolved when attributing performance to this tendon? boundary
Task loading context
Describe the activities and assumptions underlying tendon-loading observations.
Patellar tendon load exposure
Distinguish recorded activity from measured or estimated tendon mechanics.
- Which task, knee-flexion range, external resistance, repetitions, and frequency define the exposure? measurement
- If tendon force or strain is reported, was it measured or estimated, and what method and assumptions were used? provenance
- Which documented clinical plan governs any proposed change to this loading exposure? action
Localized condition evidence Organize structural observations, symptoms, and interpretations without conflating them.
Tendon structure observations
Record localized continuity and tissue appearance with acquisition provenance.
Regional structural state
Describe the observed tissue state before associating a diagnosis.
- Which region shows altered fiber appearance, focal thickening, or discontinuity, and what is its measured extent? measurement
- Which modality, examination date, and interpreter support the observation? provenance
- Is the structural interpretation definite, indeterminate, or limited by acquisition quality? boundary
Symptoms and diagnostic attribution
Connect localized symptom reports to observations while keeping diagnoses externally attributable.
Symptom and structure agreement
Capture agreement, disagreement, or missing evidence between symptoms and tendon observations.
- Where is pain or tenderness localized, and during or after which task does it occur? measurement
- Do the symptom location and structural observation concern the same tendon region? boundary
- Who assigned any diagnosis, and which competing anatomical explanations remain unresolved? provenance
Tendon history and action context Track alterations to the patellar tendon and the evidence governing subsequent review or activity.
Repair, reconstruction, and harvest
Connect tissue alterations to the current anatomical instance.
Altered patellar tendon anatomy
Record which native tissue and attachment relationships remain after an intervention.
- Was this tendon repaired, reconstructed, or used as a graft donor, and on what date? provenance
- Which region, attachment, or portion of tendon was altered according to the procedure record? boundary
- Should a referenced graft be linked as a separate tissue instance rather than identified as the remaining donor tendon? boundary
Follow-up and authorized actions
Support longitudinal comparison and apply documented clinical decisions.
Evidence-linked next step
Connect reassessment or activity decisions to current observations and responsible clinical guidance.
- Which earlier examination is comparable in tendon region, knee position, modality, and task protocol? measurement
- What restrictions or progression criteria have been documented, by whom, and for what interval? action
- Does a newly recorded discontinuity or loss of extension require clinician review under the applicable care protocol? action
Evidence and external alignment What the world already says about this thing, gathered so the model can be checked against it.
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.
- Which of these check these first hold for the sense of patellar tendon this model covers, and on what evidence? provenance
Identifiers and schemes
Recalled without web access and unsourced; every item is a lead to verify.
- Which of these identifiers and schemes hold for the sense of patellar tendon this model covers, and on what evidence? provenance
Standards and regulation
Recalled without web access and unsourced; every item is a lead to verify.
- Which of these standards and regulation hold for the sense of patellar tendon this model covers, and on what evidence? provenance
Real-world use
Recalled without web access and unsourced; every item is a lead to verify.
- Which of these real-world use hold for the sense of patellar tendon 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.
- Which of these failure modes and hazards hold for the sense of patellar tendon 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.
- Which of these neighbouring kinds and how to tell them apart hold for the sense of patellar tendon this model covers, and on what evidence? provenance
Classifiers Filled
- Family
- Thing Registry
- Category
- Physical world and living systems
- Entry kind
- thing
- Plane
- PHY
- Domain
- PHY.LIV
- Other names and narrower kinds
- right patellar ligament, left patellar ligament
What it is Filled
The patellar tendon, anatomically termed the patellar ligament, is the strong fibrous band connecting the inferior pole of the patella to the tibial tuberosity and transmitting quadriceps force through the patella to extend the knee.
In scope
- Identification of an individual tendon by subject, knee laterality, and anatomical attachments
- Inferior patellar attachment, tendon substance, and tibial tuberosity attachment
- Site-specific geometry and observations made under recorded examination conditions
- Participation in the knee extensor mechanism and evidence of functional continuity
- Localized symptoms, structural abnormalities, and their evidential relationship
- Changes following loading, injury, repair, reconstruction, or graft harvest
Out of scope
- General tendon composition, biology, and measurement principles owned by the broader tendon model
- Quadriceps muscle and quadriceps tendon as independently modeled structures
- Whole-patella, tibial, and knee-joint anatomy beyond their tendon interfaces
- Retinacula, infrapatellar bursae, and fat pad as separate anatomical structures
- Disease definitions, differential-diagnosis protocols, and treatment guidelines
- Detached graft products and surgical procedures beyond their relationships to this tendon
Why it exists Filled
Enable an agent to identify a patellar tendon, assess its documented structure and contribution to knee extension, and determine which observations or authorized actions its state supports.
Distinguishing features Filled
- In human anatomy, identify the structure by its span from the inferior patellar pole to the tibial tuberosity. [Anatomical study](https://pubmed.ncbi.nlm.nih.gov/28207972/)
- Resolve 'patellar ligament' as an anatomical naming equivalent rather than automatically creating another registered thing; the bone-to-bone attachment explains the ligament terminology. [NCBI MeSH](https://www.ncbi.nlm.nih.gov/mesh/D017847)
- Distinguish it from the quadriceps tendon by its position distal to the patella within the knee extensor mechanism. [Knee anatomy and imaging](https://www.ncbi.nlm.nih.gov/books/NBK570163/)
- Require observations to localize to the tendon substance or attachment interface; anterior knee pain alone does not establish which anatomical structure is being described.
What robots and AI may and may not do Filled
Must not
- Diagnose tendon rupture or tendinopathy for a specific person.
- Prescribe exercises, injections or surgery for a specific person.
- Push an athlete to train through tendon pain against medical advice.
- Disclose an athlete's injury records without consent.
Only with a human decision
- Treatment and return-to-sport decisions after injury.
May
- Explain the anatomy and function of the patellar tendon in general terms.
- Advise someone who cannot straighten the knee after a fall or jump to seek urgent care.
Moral aspects Filled
- Athletes are pressured to play through injury, sometimes with lasting harm.
- Health data of athletes is sensitive and can affect contracts and careers.
Who is affected
- Athletes
- Older people prone to falls
- Coaches and teams
Owners Filled
Steward
Nobody owns it; it is part of each person's body.
Links to other meta-models Filled
parent
- Q2490955 - registry parent class
What else AI and robots need to interact with it Filled
Identity and identifiers required Filled
- Vercy registry: vr.tr.patellar-tendon
- Wikidata: Q1172095 (https://www.wikidata.org/wiki/Q1172095)
Direct properties required Filled
- Anatomical instance: Subject identifier, species, left or right knee, linked patella and tibia
- Tendon region: Patellar attachment, proximal substance, midsubstance, distal substance, tibial attachment; retain localization method
- Attachment-to-attachment length: mm; record endpoint landmarks, knee flexion angle, loading condition, and modality
- Regional cross-sectional geometry: Thickness and width in mm, cross-sectional area in mm²; specify region and imaging plane
- Structural continuity: Continuous, partial discontinuity, complete discontinuity, indeterminate, not assessed; include region and evidence
- Local imaging appearance: Modality-specific description of fiber pattern, echogenicity or signal, and focal abnormalities
- Load-associated symptom response: Named symptom scale and score, exact location, provoking task, and immediate or delayed timing
- Knee extension performance: Active and passive extension in degrees, extension lag in degrees, optional torque in N·m; record protocol
- Surgical and tissue history: Native, repaired, reconstructed, partially harvested, other documented alteration, unknown; include dates
Recognition required Filled
- A thick cord that can be felt just below the kneecap, running to a bump on the shinbone.
Capabilities and actions required Filled
- Map a clinical or imaging reference to the correct subject, knee, tendon region, and anatomical name.
- Compare regional geometry and continuity across examinations with compatible acquisition conditions.
- Relate tendon observations to documented knee-extension performance without assigning unsupported causation.
- Track task-specific loading and symptom responses over time.
- Identify unresolved findings for clinician review and associate existing clinical restrictions with the tendon.
- Record the anatomical consequences of repair, reconstruction, or graft harvest.
Hazards and failure modes required Filled
- Jumper's knee from overuse causes pain below the kneecap.
- Complete rupture prevents straightening the knee.
Standards and interfaces required Filled
- Terminologia Anatomica, Federative International Programme for Anatomical Terminology, which names it the patellar ligament.
Context of use required Filled
- The patellar tendon is encountered in anatomical study, knee imaging and assessments of movement or injury.
- It transmits force from the patella to the tibia during knee extension, contributing to standing, walking, running and jumping.
Sources Filled
- Wikidata item Q1172095: patellar tendon - identity and sense of the item
- Wikipedia: Patellar tendon - general description of the item
Open questions
- Does vr.tr.patellar-tendon intentionally cover nonhuman anatomy, or should its scope be explicitly human?
- Which existing Vercy tendon and knee extensor-mechanism models should supply inherited properties and relationships without duplicating coverage?
- Which region definitions and measurement protocols provide reproducible patellar tendon comparisons across ultrasound, MRI, and direct examination?
- Which reference ranges and meaningful-change thresholds are supported for specific ages, body sizes, activity levels, and intervention histories?
- What evidence and clinical protocols should govern interpretation when structural appearance, localized symptoms, and extension performance disagree?
Machine files
Provenance
thing registry research (pass 2) · unreviewed
Built from: models/things/publications/thing-q1172095/spec.json