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Post-Traumatic Arthritis Following Intra-Articular Fractures: First Hit Or Chronic Overload?

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Post-Traumatic Arthritis Following Intra-Articular Fractures: First Hit Or Chronic Overload? Post-Traumatic Arthritis Following Intra-Articular Fractures: First Hit or Chronic Overload? Mara L. Schenker, MD1 Introduction and a cell population (chondrocytes)10. The Robert L. Mauck, PhD1 Post-traumatic osteoarthritis (PTOA) composition, architecture, and remodeling Jaimo Ahn, MD, PhD1 occurs after traumatic injury to the joint; most of articular cartilage are uniquely adapted to Samir Mehta, MD1 commonly following injuries that disrupt the function over a lifetime of repetitive use, but 1 University of Pennsylvania articular surface, or injuries that lead to joint are inherently poor responders to traumatic Department of Orthopaedic Surgery instability1. It has been suggested that 12% injury. Mechanical loading of articular cartilage, Philadelphia, PA of the global osteoarthritis burden can be such as during injury, generates a biologic attributed to previous trauma, and that the cost response from the tissue down to the cellular burden in the United States is approximately level, activating intracellular signaling cascades, 3.06 billion dollars annually2. The risk of post- through a process called mechanotransduction. traumatic arthritis following significant joint Depending on the nature of the mechanical trauma has been reported to be as high as 20- insult and the post-injury environment, cartilage 74%, and articular fractures increase the risk may either recover or degrade, leading to PTOA10. of osteoarthritis more than 20-fold3-5. Despite One of the proposed mechanisms of changes in surgical treatment, including PTOA in intra-articular fractures is a “first- fracture fixation and management of chondral hit phenomenon”—that is, acute insult to injuries, the incidence of post-traumatic arthritis the cartilage triggers death or dysfunction of following intra-articular fractures is relatively chondrocytes with subsequent dysfunction of unchanged over the last few decades6. cartilage metabolism. This presumably triggers a The mechanisms and contributing factors cascade of whole-joint degeneration. In explanted to the development of PTOA following intra- tissues after intra-articular calcaneal fractures, articular fractures are not well-understood; chondrocyte viability was significantly lower than hence, the ability to clinically intervene and control specimen (73% versus 95% viability)11. In forestall the progression of PTOA is currently a recent study, Tochigi et al. simulated a whole- limited. The best current data suggests that joint model of intra-articular tibial plafond injury factors contributing to PTOA are multiple, by delivering an impaction injury to a whole fresh including acute mechanical cartilage injury at human ankle cadaveric specimen12. The authors the time of impact, biologic response including observed a reproducible pattern of plafond injury bleeding and inflammation, and chronic cartilage and chondrocyte death, with significantly more overload from incongruity, instability, and death adjacent to the fracture lines than distant malalignment. Other factors, including patient from the fracture (26% death near fracture vs. age7, and injury severity8,9, may also contribute 8.6% death remote from fracture). Chondrocyte to worse clinical outcomes and progressive death progressed over 48 hours after the initial degeneration after intra-articular fractures. injury12. Further, animal models have re-enforced The purpose of this review is to describe this idea that chondrocyte death occurs at the the multifactorial contributors associated with fracture site following impaction injuries, with the development of PTOA after intra-articular more chondrocyte death in fractured specimen, fracture, to provide insight into possible clinical when compared to sub-fracture impaction interventions to forestall or halt the progression injuries, likely due to the supraphysiological of PTOA in traumatically-injured patients. forces associated with actual fracture of the articular surface13. The “First Hit” Phenomenon—Articular Several in vitro studies have sought to examine the pattern of chondrocyte death (apoptosis Cartilage: Structure, Function, and versus necrosis) and the mechanisms associated Response to Mechanical Injury with cell death. Martin et al. demonstrated that Articular cartilage is comprised of 60- 65% of chondrocytes necrose within the first 85% water, with the dry contents including 12 hours following injury in a bovine explant Corresponding author: extracellular matrix (ECM) components of impaction injury model14. Further, several Samir Mehta, MD 3400 Spruce St. collagens (primarily type II, but also types VI, IX, studies have observed markers of apoptosis in 2 Silverstein and XI) and proteoglycans (primarily aggrecan, explanted human cartilage specimen following Philadelphia, PA 19104 15,16 [email protected] but also decorin, biglycan, and fibromodulin), intra-articular fractures . 26 UNIVERSITY OF PENNSYLVANIA ORTHOPAEDIC JOURNAL POST-TRAUMATIC ARTHRITIS FOLLOWING INTRA-ARTICULAR FRACTURES: FIRST HIT OR CHRONIC OVERLOAD? 27 One of the proposed mechanisms for chondrocyte death is will present the available experimental and clinical data that that release of reactive oxygen species and/or pro-inflammatory examines the impact of articular congruity and stability on the mediators following injury lead to progressive chondrocyte development of PTOA in intra-articular fractures. damage and matrix degeneration. In several in vitro studies In human cadaveric ankles, McKinley et al. observed of impact injuries on cartilage explants, injury induced the increases in contact stresses of up to 300% in specimen release of oxygen free radicals from chondrocytes, possibly with articular stepoffs compared to controls25. Further, they from mitochondrial injury17, which led to chondrocyte death later noted that instability superimposed on articular surface and matrix degeneration1,17. Further, more severe injuries, incongruities caused disproportionate increases in contact resulting from higher impact injuries, resulted in greater stress rates26. Further, a cadaveric finite element model local tissue damage, as measured by a higher proportion of showed that instability and articular stepoff yield significant cells releasing reactive oxygen species, and a higher rate changes in the loading pattern of articular cartilage, resulting of chondrocyte death and matrix disruption1,18. Further, in increased stress magnitudes and loading rates27. Anderson intra-articular fracture has been shown to result in elevated et al. presented a patient-specific finite element model of an synovial levels of pro-inflammatory cytokines and mediators, injured human population of tibial plafond fractures28,29. In including tumor necrosis factor-alpha, interleukin-1, nitrous this study, the authors observed that intact ankles had lower oxide, matrix metalloproteinases, and fibronectin fragments, peak contact stresses that were more uniform and centrally which can stimulate cell and matrix degradation1,19-21. located than fractured ankles29. At 2 years post-injury, the Finally, recent studies have demonstrated that cellular authors correlated the initial finite element model with events related to initial impact injuries are associated with the radiographic outcomes, and observed that 5 different metrics progression of PTOA in animal models. Furman et al. observed of cartilage stresses were associated with the development degenerative changes, including loss of bone density and increases of PTOA, and suggested that there may be a contact stress in subchondral bone thickness, as early as 8 weeks following exposure threshold above which incongruously reduced untreated closed impaction injuries of the tibial plateau in mice, plafond fractures develop PTOA. with severe cartilage loss by 50 weeks20,21. Further, these authors On the contrary, many experimental models of joint showed that the joint changes are accompanied by rapid changes incongruity demonstrate relatively mild increases in in pro-inflammatory cytokines and cartilage biomarkers in the articular surface contact stresses, even in the setting of large serum and synovial fluid22. In another animal model, the authors incongruities24,30-33. In a canine cadaveric model, statically compared the injury patterns in standard C57Bl/6 mice with loaded defects of 7mm in the medial femoral condyle showed those in a breed of mice (MRL/MpJ) that produce a decreased mean increases in contact stresses of only 10-30%31. These inflammatory response to injury via decreased production of pro- results are likely confounded by the fact that the specimen in inflammatory cytokines (interleukin-1) and increased production multiple studies are most frequently statically loaded across of anti-inflammatory cytokines (interleukins-4 and 10). This a fixed joint position without motion. This testing method model demonstrated decreased joint inflammatory response to cannot detect transiently elevated contact stresses, cumulative intra-articular injury, with relative radiographic protection from stresses that occur during motion, or account for the effects of PTOA23, suggesting that decreasing the inflammatory response joint instability24. Improved methods of assessing the effects of clinically may perhaps decrease the severity of PTOA in patients post-fixation articular incongruity and instability are needed to with intra-articular fractures. better elucidate the impact of these factors on the progression of PTOA and outcomes following intra-articular fractures. In the clinical literature, a recent systematic review The “Second
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