COMPARISON OF RADIOGRAPHIC SUBCHONDRAL BONE CHANGES WITH ARTHROSCOPIC FINDINGS IN THE EQUINE FEMOROPATELLAR AND FEMOROTIBIAL JOINTS: A RETROSPECTIVE STUDY OF 72 JOINTS (50 HORSES)

Authors

  • Daniel N. Steinheimer DVM,

    Corresponding author
    1. Departments of Radiological Health Sciences College of Veterinary Medicine and Biomedical Sciences, Colorado State University.
    Search for more papers by this author
  • C. Wayne McIlwraith BVSc, PhD, FRCVS,

    1. Departments of Radiological Clinical Sciences, College of Veterinary Medicine and Biomedical Sciences, Colorado State University.
    Search for more papers by this author
  • Richard D. Park PhD,

    1. Departments of Radiological Health Sciences College of Veterinary Medicine and Biomedical Sciences, Colorado State University.
    Search for more papers by this author
  • Phillip F. Steyn BVSc, MRCVS, MS

    1. Departments of Radiological Health Sciences College of Veterinary Medicine and Biomedical Sciences, Colorado State University.
    Search for more papers by this author

Address correspondence and reprint requests to: D. N. Steinheimer, DVM, College of Veterinary Medicine, Department of Large Animal Medicine and Surgery, Texas A.& M. University, College Station, TX 77843.

Abstract

Radiographs of 72 femoropatellar and femorotibial joints from 50 horses were evaluated. Ninety four arthroscopically evaluated areas were graded according to a predetermined system. The radiographic grade was then compared to arthroscopic findings in the same location. Statistical analysis was performed to determine the association between the radiographic subchondral bone changes and arthroscopic findings. Radiographically normal areas in the femoropatellar joint were arthroscopically positive for cartilaginous changes in 40% of the femoropatellar joints. Areas of mild subchondral bone flattening (grade I) in the lateral trochlear ridge were arthroscopically positive for cartilage changes 78% of the time. Ninety six percent of moderate to severe subchondral bone changes (grades II-V) were arthroscopically positive for cartilage damage. This research demonstrates that (1) a significant number of radiographically normal joints will have cartilage changes, (2) areas of mild subchondral bone flattening have cartilage changes present in the majority of cases and (3) areas of moderate to severe subchondral bone changes have arthroscopically detectable cartilage changes present.

Ancillary