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Regional and Arthroscopic Anatomy of the Caudomedial Portal

Cody Laas; Donald Hulse, DVM, Diplomate ACVS


  1. To describe a caudomedial arthroscopy portal in the stifle of the dog
  2. To evaluate the novel portal site for visibility of intra-articular structures.

Design-Dissect canine cadaver limbs to document regional anatomy; perform arthroscopy on canine cadaver limbs using the novel site and document articular structures viewed.

Results-A caudomedial portal was placed into the caudomedial joint space distal to the medial fabella and proximal to the insertion of the caudal belly of the semimembranosus m.  The site allowed placement of the arthroscope immediately caudal to the femoral tibial articulation. The insertion of the caudal cruciate ligament, the peripheral rim of medial meniscus,  the caudal quadrant of the medial femoral condyle, and the caudal joint capsule were easily viewed.  We were not able to view the caudal horn of the medial meniscus.

Conclusion-The caudomedial portal was easily accessible without iatrogenic injury to surrounding extra-articular or intra-articular structures.  Furthermore, we were able to accurately access and view the caudal cruciate ligament, caudal joint capsule space, caudal quadrant of the medial femoral condyle, and the caudal meniscocapsular ligament.    The incidence of caudal cruciate ligament and caudal joint capsule pathology is rare, thus the need for the caudomedial portal may be limited.