{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2023,11,15]],"date-time":"2023-11-15T08:12:30Z","timestamp":1700035950650},"reference-count":24,"publisher":"Wiley","issue":"4","license":[{"start":{"date-parts":[[2007,1,4]],"date-time":"2007-01-04T00:00:00Z","timestamp":1167868800000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Journal Orthopaedic Research"],"published-print":{"date-parts":[[2007,4]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>The purpose of this study was to determine what characteristics of fixation devices used in the treatment of osteochondritis dissecans (OCD) contribute to improved stability to resist shear loading. An OCD model was designed using rigid polyurethane foam. Each specimen consisted of two components, an osteochondral fragment and a corresponding defect. A total of 40 specimens were prepared and assigned to one of four groups: control (no extrinsic stabilizer); two 2\u2010mm\u2010diameter Kirschner wires (K\u2010wires), 40 mm in length; one threaded washer and a 28\u2010mm screw; and one threaded washer and a 38 mm screw. Each specimen was mounted onto an Iosipescu shear test fixture and subjected to shear loads at a pseudo\u2010static displacement rate of 0.075 mm\/s. All groups demonstrated some stability; controls were significantly less stable than all other groups. The group with the threaded washer and 38\u2010mm screw demonstrated the greatest stability (<jats:italic>p<\/jats:italic>\u2009&lt;\u20090.001), and no difference was noted between the K\u2010wire and 28\u2010mm screw groups. These results suggest that, in this OCD model, friction conferred some intrinsic stability to resist loads in shear. However, stability was improved with the use of long implants that compressed the fragments together. \u00a9 2007 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. 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