Patellar tooth sign refers to vertical ridging of the osteophytes at the patellar insertion of the quadriceps tendon which can resemble a dentate structure, i.e. "tooth" sign.
No correlation with patient's clinical symptoms.
- frequent finding with degenerative disease
- degenerative enthesophyte formation on superior aspect of patella (site of insertion of the quadriceps tendon) as seen on axial or skyline (sunrise) view
- seen as saw-tooth projections: best seen on axial or skyline view of patella on its superior and anterior surface
- 1.Greenspan A, Norman A, Tchang FK. "Tooth" sign in patellar degenerative disease. J Bone Joint Surg Am. 1977;59 (4): 483-5. Pubmed citation