Effect of Ulnar Ostectomy on Intra‐Articular Pressure Mapping and Contact Mechanics of the Congruent and Incongruent Canine Elbow Ex Vivo. Issue 3 (27th January 2014)

• Record Type: Journal Article
• Authors: Krotscheck, Ursula; Kalafut, Sarah; Meloni, Gregory; Thompson, Margret S.; Todhunter, Rory J.; Mohammed, Hussni O.; van der Meulen, Marjolein C.H.
• Is Part Of: Veterinary surgery. Volume 43:Issue 3(2014)
• Page Start: 339
• Page End: 346
• Publication Date: 2014-01-27
• Subjects: Veterinary surgery -- Periodicals; Veterinary Medicine -- Periodicals; Surgery -- Periodicals; Societies, Medical -- Periodicals; 636.0897
• DOI: 10.1111/j.1532-950X.2014.12137.x
• Languages: English
• ISSNs: 0161-3499

Abstract

<abstract abstract-type="main"> <title> <x xml:space="preserve">Abstract</x> </title> <sec id="vsu12137-sec-0001" sec-type="section"> <title>Objective</title> <p>To determine (1) the effect of elbow incongruity on contact mechanics and (2) the effect of treatment of this incongruity with 1 of 2 ulnar ostectomies in the canine elbow.</p> </sec> <sec id="vsu12137-sec-0002" sec-type="section"> <title>Study Design</title> <p> <italic>Ex vivo</italic> biomechanical study.</p> </sec> <sec id="vsu12137-sec-0003" sec-type="section"> <title>Sample Population</title> <p>Unpaired cadaveric canine forelimbs (n = 17).</p> </sec> <sec id="vsu12137-sec-0004" sec-type="section"> <title>Methods</title> <p>In a servohydraulic testing frame, thin‐film pressure sensors were placed into the lateral and medial compartments of the elbow. Specimens were tested in 135° of elbow joint flexion at 200 N of cyclic axial force, followed by a 20 seconds hold. Intra‐articular contact area (CA), mean contact pressure (mCP) and peak contact pressure (pCP) were measured in each compartment. After radial shortening, testing was repeated and limbs randomized into proximal ulnar ostectomy with IM pin (PUO) or sequential distal ulnar ostectomy (DUO), interosseous ligament release (DUO‐L), and ulnar attachment of the abductor pollicis longus muscle and interosseous membrane release (DUO‐ML). Paired <italic>t</italic>‐tests were used to compare each treatment to baseline values. Differences between treatment groups were evaluated with a mixed model with random effect to adjust for the clustering of limbs within dog. <italic>P</italic> < .05 was considered significant.</p> </sec> <sec id="vsu12137-sec-0005" sec-type="section"> <title>Results</title> <p>Radial shortening resulted in shift of mCP and pCP from the lateral to the medial compartment. The PUO group resulted in normalization of medial compartment mCP and decrease of pCP, whereas in the DUO group return to baseline was achieved only after DUO‐ML.</p> </sec> <sec id="vsu12137-sec-0006" sec-type="section"> <title>Conclusion</title> <p>PUO is effective in unloading medial compartment pCP in an incongruent joint.</p> </sec> </abstract>