Biomechanics of osteochondral impact with cushioning and graft Insertion: Cartilage damage is correlated with delivered energy

JOURNAL OF BIOMECHANICS

卷:73

Article

Su, Alvin W.¹  Chen, Yunchan²  Dong, Yao²  Wailes, Dustin H.²  Wong, Van W.²  Chen, Albert C.²  Cai, Shengqiang^1,3  Bugbee, William D.^5,6  Sah, Robert L.^1,2,4,5 

[1] Univ Calif San Diego, Mat Sci & Engn Grad Program, La Jolla, CA 92093 USA

[2] Univ Calif San Diego, Dept Bioengn, 9500 Gilman Dr,Mail Code 0412, La Jolla, CA 92093 USA

[3] Univ Calif San Diego, Dept Mech & Aerosp Engn, La Jolla, CA 92093 USA

[4] Univ Calif San Diego, Dept Orthopaed Surg, La Jolla, CA 92093 USA

[5] Univ Calif San Diego, Inst Engn Med, Ctr Musculoskeletal Res, La Jolla, CA 92093 USA

[6] Scripps Clin, Dept Orthopaed Surg, La Jolla, CA USA

关键词: Articular cartilage;    Cartilage mechanics;    Impact mechanics;    Osteochondral autograft;    Osteochondral allograft;   

DOI  :  10.1016/j.jbiomech.2018.03.037

来源: Elsevier

【 摘 要 】

Articular cartilage is susceptible to impact injury. Impact may occur during events ranging from trauma to surgical insertion of an OsteoChondral Graft (OCG) into an OsteoChondral Recipient site (OCR). To evaluate energy density as a mediator of cartilage damage, a specialized drop tower apparatus was used to impact adult bovine samples while measuring contact force, cartilage surface displacement, and OCG advancement. When a single impact was applied to an isolated (non-inserted) OCG, force and surface displacement each rose monotonically and then declined. In each of five sequential impacts of increasing magnitude, applied to insert an OCG into an OCR, force rose rapidly to an initial peak, with minimal OCG advancement, and then to a second prolonged peak, with distinctive oscillations. Energy delivered to cartilage was confirmed to be higher with larger drop height and mass, and found to be lower with an interposed cushion or OCG insertion into an OCR. For both single and multiple impacts, the total energy density delivered to the articular cartilage correlated to damage, quantified as total crack length. The corresponding fracture toughness of the articular cartilage was 12.0 mJ/mm(2). Thus, the biomechanics of OCG insertion exhibits distinctive features compared to OCG impact without insertion, with energy delivery to the articular cartilage being a factor highly correlated with damage. (C) 2018 Elsevier Ltd. All rights reserved.

【 授权许可】

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