Case Study: Tank
Antebrachial Angular Limb Deformity Correction
Deformity Assessment
Tank the Corgi had an extreme case of valgus, procurvatum, and external rotational limb deformity in both his right and left antebrachium. Correction for the right antebrachium required removal of a large wedge of bone at the center of rotation and angulation indicated by the annotation in the right photo.
Before
After
Before
After
Planned
Correction
We removed a large wedge at the CORA using CAD software. We then repositioned the two segments of his left antebrachium to correct the deformity according to the intended surgical plan.
Reduction Guide Design
The surgeon requested a medial reduction guide. The profile was kept as small as possible to avoid infringing upon placement of the cranial implant. Finally, we inscribed the case number and a "P" on the proximal side of the guide to make the guide.
Ostectomy Guide Design
The design of the ostectomy guide proved difficult due to the extreme correction needed and the small footprint of the bone itself. We settled on a design that would wrap around the most irregular parts of the bone to ensure it would self locate. We included two cut surfaces to guide a 35mm blade during the incision.
Completed Bone & Guide Prints
We printed two reduction guides and two ostectomy guides in biocompatible resin and one pre-op and one post-op bone model in standard non-biocompatible resin. The osteotomy guide fit the pre-op bone as anticipated, and the reduction guide could slide easily onto the post-op bone.
Surgical Outcome
See Tank's corrected forelimbs after the first and second surgeries using printed surgical guides. The rotational deformities have been corrected and he has been healing well since both operations.