RESULTSДЄ total of 81 reports issued by the same radiologist over 12 years included the term вЂњanserine.вЂќ Review of the radiographs on a PACS workstation identified 31 patients with pes anserine exostosis. The MRIвЂ™s of patients from this cohort was also analyzed. Institutional Board Approval was obtained for this retrospective study. In addition, a further computerized search was undertaken to establish the total number of knee radiographs the same radiologist had reported in the 12-year period. The medical records were reviewed to ascertain the presenting complaint and subsequent management.

These cases form the basis of this study. The radiographs and any other imaging on the PACS were reviewed to identify those cases in which an exostosis arising from the medial aspect of the proximal tibial metaphysis was present. All the reports in which the term вЂњanserineвЂќ was included were recorded. A computerized search was conducted of all the reports issued by the senior author on a departmental PACS from August 2009 to March 2020. This retrospective study was performed in the setting of a specialist orthopedic hospital. This rare form of exostosis arises from the medial aspect of the proximal tibia and the purpose of this retrospective study was to attempt to assess its incidence and significance. There is, however, one exception where there is also continuity of marrow and cortex between the bony outgrowth and the parent bone. This helps differentiate osteochondroma from the other forms of exostosis as well as diverse bone-forming surface lesions such as osteoma, bizarre parosteal osteochondromatous proliferation, periostitis ossificans, and parosteal osteosarcoma. Osteochondroma is the most common of all exophytic bone lesions and a useful distinguishing feature is the radiographic identification of continuity of the marrow and cortex with the underlying bone. The term is synonymous with osteochondroma, also known as cartilage-capped exostosis, but is also used with other bony excrescences such as subungual exostosis and turret exostosis.

An exostosis is defined as a benign outgrowth of bone projecting from the outer cortex.

Pes anserine muscle