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Trait

Double-layered patella

An anomaly of the patella characterized by two layers visible on lateral knee X-ray such that one layer is in front of the other in the sagittal orientation (See Figure 2A and 3B of PMID:12966518). This finding persists into adulthood.

HPO HP:0031174

Summary

Body system
Abnormality of limbsAbnormality of the musculoskeletal system

2 condition reports read genes linked to this trait

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1 gene linked to Double-layered patella

Changes in these genes cause rare conditions in which Double-layered patella is seen. Most people with this trait have none of those conditions, and a gene on this list says nothing about anyone's own genome.

GeneHow often it is seenConditions
SLC26A2solute carrier family 26 member 2Often (30–79%)In 2 conditions

How often is among people with one of the gene's conditions, the most often across them, as the Human Phenotype Ontology records it. These pages describe traits and the research behind them; they are not a diagnosis, and a doctor or genetic counsellor is the person to ask about symptoms.

Broader traits

Abnormal kneecap

Where this comes from

  • The Human Phenotype Ontology, release 2026-09-01: the trait, its names, its definition and the genes linked to it. Find out more at hpo.jax.org.
  • Data release 2026.10.17-8666dff2.

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