Arthroscopic Preparation and Internal Fixation of an Unstable Osteochondritis Dissecans Lesion of the Knee Christopher L. Camp, M.D., Aaron J. Krych,

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Arthroscopic Preparation and Internal Fixation of an Unstable Osteochondritis Dissecans Lesion of the Knee Christopher L. Camp, M.D., Aaron J. Krych, M.D., Michael J. Stuart, M.D. Arthroscopy Techniques Volume 2, Issue 4, Pages e461-e465 (November 2013) DOI: 10.1016/j.eats.2013.07.005 Copyright © 2013 Arthroscopy Association of North America Terms and Conditions

Fig 1 Initial presenting right knee radiographs showing an OCD lesion of the lateral femoral condyle on (A) posteroanterior (PA) flexion and (B) lateral views. Arthroscopy Techniques 2013 2, e461-e465DOI: (10.1016/j.eats.2013.07.005) Copyright © 2013 Arthroscopy Association of North America Terms and Conditions

Fig 2 Initial (A) sagittal and (B) coronal T2-weighted magnetic resonance images obtained before initiation of nonoperative treatment, showing the OCD lesion of the lateral femoral condyle of the right knee. One should note the increased linear signal at the base of the lesion present on both views. (C) Sagittal and (D) coronal T2-weighted magnetic resonance images of the knee obtained after 5 months of nonoperative treatment showing minimal improvement or interval healing. We find magnetic resonance imaging very helpful in measuring the amount of bone present on the OCD lesion and also if there is any fragmentation present. Arthroscopy Techniques 2013 2, e461-e465DOI: (10.1016/j.eats.2013.07.005) Copyright © 2013 Arthroscopy Association of North America Terms and Conditions

Fig 3 Arthroscopic view of OCD lesion of lateral femoral condyle from inferomedial viewing portal. Arthroscopy Techniques 2013 2, e461-e465DOI: (10.1016/j.eats.2013.07.005) Copyright © 2013 Arthroscopy Association of North America Terms and Conditions

Fig 4 Arthroscopic view (from inferomedial viewing portal) of subchondral bone after lesion has been hinged open. Arthroscopy Techniques 2013 2, e461-e465DOI: (10.1016/j.eats.2013.07.005) Copyright © 2013 Arthroscopy Association of North America Terms and Conditions

Fig 5 Arthroscopic view (from inferomedial viewing portal) of base after removal of fibrous nonunion tissue. The bleeding bone confirming vascularity should be noted. Arthroscopy Techniques 2013 2, e461-e465DOI: (10.1016/j.eats.2013.07.005) Copyright © 2013 Arthroscopy Association of North America Terms and Conditions

Fig 6 Final view (from inferomedial viewing portal) of OCD lesion showing multi-point screw fixation. Arthroscopy Techniques 2013 2, e461-e465DOI: (10.1016/j.eats.2013.07.005) Copyright © 2013 Arthroscopy Association of North America Terms and Conditions

Fig 7 Radiographs of knee obtained 12 weeks postoperatively showing satisfactory restoration of articular surfaces: (A) anteroposterior view and (B) lateral view. Arthroscopy Techniques 2013 2, e461-e465DOI: (10.1016/j.eats.2013.07.005) Copyright © 2013 Arthroscopy Association of North America Terms and Conditions