Arthroscopic Management of Isolated Tibial Plateau Defect With Microfracture and Micronized Allogeneic Cartilage–Platelet-Rich Plasma Adjunct  Kevin C.

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Arthroscopic Management of Isolated Tibial Plateau Defect With Microfracture and Micronized Allogeneic Cartilage–Platelet-Rich Plasma Adjunct  Kevin C. Wang, B.S., Rachel M. Frank, M.D., Eric J. Cotter, B.S., David R. Christian, B.S., Brian J. Cole, M.D., M.B.A.  Arthroscopy Techniques  Volume 6, Issue 5, Pages e1613-e1618 (October 2017) DOI: 10.1016/j.eats.2017.06.018 Copyright © 2017 Arthroscopy Association of North America Terms and Conditions

Fig 1 Left knee. T2-weighted coronal magnetic resonance imaging accentuates the presence of articular cartilage defects and allows easy assessment of subchondral edema. An isolated lateral tibial plateau cartilage defect with minimal subchondral edema is shown. Arthroscopy Techniques 2017 6, e1613-e1618DOI: (10.1016/j.eats.2017.06.018) Copyright © 2017 Arthroscopy Association of North America Terms and Conditions

Fig 2 Arthroscopic debridement of articular cartilage defect. The left lateral tibial plateau is viewed through the anteromedial portal with the patient supine and the knee in figure-four position. (A) To prepare the defect for microfracture, the periphery should be debrided to a stable rim. Any delaminated cartilage is removed from the defect. Vertical walls are established to maximize the probability of complete cartilage fill. A rotary shaver can be useful in debriding the defect in preparation for microfracture. (B) The calcified layer of cartilage is removed before microfracture with a curette. Exposing bare subchondral bone promotes fibrocartilage fill after marrow simulation. Arthroscopy Techniques 2017 6, e1613-e1618DOI: (10.1016/j.eats.2017.06.018) Copyright © 2017 Arthroscopy Association of North America Terms and Conditions

Fig 3 Microfracture technique. The left lateral tibial plateau is viewed through the anteromedial portal with the patient supine and the knee in figure-four position. (A) After debridement of any delaminated cartilage, microfracture holes are placed in the bare subchondral bone with a PowerPick to allow access to marrow elements, including mesenchymal stem cells. This device allows atraumatic perforation of the plate, minimizing the chance of ectopic bone formation. (B) Microfracture holes are placed 2 to 3 mm apart while confluence is avoided to minimize trauma to the subchondral plate. The goal is to obtain access to the bone marrow elements facilitating cartilage fill without causing excessive injury to the subchondral bone. Arthroscopy Techniques 2017 6, e1613-e1618DOI: (10.1016/j.eats.2017.06.018) Copyright © 2017 Arthroscopy Association of North America Terms and Conditions

Fig 4 Preparation for micronized allogeneic cartilage (MAC)–platelet-rich plasma (PRP) application. The left lateral tibial plateau is viewed through the anteromedial portal with the patient supine and the knee in figure-four position. (A) To apply MAC-PRP to the defect bed, all arthroscopic fluid is removed from the joint. Neurosurgical patties are used to dry the defect bed thoroughly in preparation for MAC-PRP application. (B) Bleeding into the defect bed can be controlled with tourniquet pressure. A dry defect bed ensures optimal adherence of the MAC-PRP mixture. Arthroscopy Techniques 2017 6, e1613-e1618DOI: (10.1016/j.eats.2017.06.018) Copyright © 2017 Arthroscopy Association of North America Terms and Conditions

Fig 5 Platelet-rich plasma (PRP) preparation. (A) Arthrex double-syringe ACP (Autologous Conditioned Plasma) system for collecting PRP. Fifteen milliliters of peripheral blood is drawn from the patient into the larger syringe and placed into a centrifuge at 1,500 rpm for 5 minutes to separate it into PRP, buffy coat, and red blood cell constituents. (B) After centrifugation, the PRP component is drawn into the smaller syringe, with care taken not to aspirate the buffy coat or red blood cell layers. For micronized allogeneic cartilage applications, approximately 1.5 mL (enough for a 1:1 ratio with the micronized allogeneic cartilage powder) is sufficient. Arthroscopy Techniques 2017 6, e1613-e1618DOI: (10.1016/j.eats.2017.06.018) Copyright © 2017 Arthroscopy Association of North America Terms and Conditions

Fig 6 Application of micronized allogeneic cartilage (MAC)–platelet-rich plasma (PRP) mixture. The left lateral tibial plateau is viewed through the anteromedial portal with the patient supine and the knee in figure-four position. (A) The MAC-PRP mixture is applied into the joint with a Tuohy needle. Enough of the mixture is used to ensure complete coverage at a level that is slightly below that of the surrounding cartilage. (B) After application of the MAC-PRP mixture, a freer elevator can be used to smooth the surface of the mixture. The objective is to obtain a smooth surface that lies slightly below the surrounding cartilage rim before the mixture is fixed with fibrin glue. Arthroscopy Techniques 2017 6, e1613-e1618DOI: (10.1016/j.eats.2017.06.018) Copyright © 2017 Arthroscopy Association of North America Terms and Conditions