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33rd Annual Scientific Meeting proceedings

Stream:   |   Session:
Date/Time: 30-11--0001 (00:00 - 00:00)   |   Location:
Osteophyte formation in the fragment bed of the Intermediate Ridge of the distal Tibia
Winberg F1, Ekman S2
1Evidensia Equine Hospital, Stav, Tungelsta, Sweden, 2Swedish University of Agricultural Sciences, Uppsala, Sweden.

Osteophyte formation in the fragment bed of the Intermediate Ridge of the distal Tibia

Introduction: Occasionally we have experienced postoperative complaints about fragments left behind after arthroscopic surgery of the tarso-crural joint. However, follow up of this occurrence has been limited. The opportunity to properly explore this potential complication arose in 2022.

Materials and methods: A 6-year-old Swedish Warmblood gelding, operated 2 years previously for osteochondrosis dissecans (OCD) located cranially on the intermediate ridge of the distal tibia in the left tarso-crural joint, was re-radiographed at pre-purchase examination (2022).  Suspicion of a fragment in the same location as the previous OCD, arose. During the interim, there were no problems associated with the left tarso-crural joint. The horse was re-operated and an osteochondral fragment was removed, placed in buffered 10% formaldehyde and sent for microscopic examination. The tissue was dehydrated, paraffin embedded, cut into 4µm sections and stained with hematoxylin & eosin for light microscopic examination.

Results: The microscopic examination revealed areas of mature lamellar bone tissue including peripheral woven bone. Multiple streaks of chondroid tissue surrounded the bone, with foci of fibrous cartilage and small areas representing endochondral ossification. A dense fibrous tissue, with foci outlined by synovial lining, surrounded the osteochondral bone fragment. The morphology of the fragment was compatible with an osteophyte formation. 

Discussion: This case shows that osteophyte formation can develop after arthroscopic removal of an OCD fragment in the tarso-crural joint. This has, to our knowledge, not been described in the literature.  

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