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Kara M. Burns
MS, MEd, LVT, VTS (Nutrition), VTS-H (Internal Medicine, Dentistry), Editor in Chief
Kara Burns is an LVT with master’s degrees in physiology and counseling psychology. She began her career in human medicine working as an emergency psychologist and a poison specialist for humans and animals. Kara is the founder and president of the Academy of Veterinary Nutrition Technicians and has attained her VTS (Nutrition). She is the editor in chief of Today’s Veterinary Nurse. She also works as an independent nutritional consultant, and is the immediate past president of NAVTA. She has authored many articles, textbooks, and textbook chapters and is an internationally invited speaker, focusing on topics of nutrition, leadership, and technician utilization.Read Articles Written by Kara M. Burns
Osteoarthritis is the most common form of joint disease recognized in mammals.1 It often leads to physical incapacity, pain, and a subsequent reduction in pets’ quality of life. It is also challenging to treat due to the difficulty of recognizing signs early and its inevitably progressive pathology.2 Veterinary nurses are uniquely positioned to identify potential changes in mobility with pet owners and bring this information to the veterinarian. Management of osteoarthritis requires a multimodal approach, including identification and management of obesity, as well as therapeutic nutrition.
Pathophysiology of Osteoarthritis
Osteoarthritis is a slowly progressive condition characterized by 2 main pathologic processes: degeneration of articular cartilage with a loss of proteoglycan and collagen, and proliferation of new bone. Additionally, there is an inflammatory response within the synovial membrane.3 In North America, age-specific prevalence values range from 20% in dogs older than 1 year to 80% in dogs older than 8 years, based on radiographic and clinical data from referral settings.4,5 In adult cats, the prevalence of osteoarthritis is 33%, rising to 90% in senior cats.6
Inflammation and Cartilage Degradation
Inflammation plays a fundamental role in the pathophysiology of osteoarthritis. Arachidonic acid (AA) and eicosapentaenoic acid (EPA) are polyunsaturated fatty acids that act as precursors for the synthesis of eicosanoids, a significant group of immunoregulatory molecules that function as local hormones and mediators of inflammation. The amounts and types of eicosanoids synthesized are determined by the availability of the fatty acid precursor and by the activities of the enzyme systems that synthesize them. Eicosanoids produced from AA are proinflammatory and, when produced in excess, may result in pathologic conditions. In contrast, eicosanoids derived from EPA promote minimal to no inflammatory activity.7
Cartilage degradation begins with loss of cartilage aggrecan and is followed by loss of cartilage collagens. This results in the loss of ability to resist compressive forces during movement of the joint.
Risk factors for pets to develop osteoarthritis include age, breed, genetics, developmental orthopedic disease, trauma, and obesity. The radiographic prevalence of canine hip dysplasia, a leading cause of osteoarthritis in dogs, has been reported to be as high as 70% in golden retrievers and Rottweilers.8 The incidence and severity of osteoarthritis secondary to canine hip dysplasia can be significantly influenced by environmental factors such as nutrition and lifestyle.9,10
Obesity is also a risk factor for the most common traumatic cause of osteoarthritis in dogs, ruptured cruciate ligaments. Overweight or obese dogs have a
2 to 3 times greater prevalence of ruptured cruciate ligaments compared with normal-weight dogs.11
In 2 studies, overweight cats, compared with optimal-weight cats, were 3 times as likely to be taken to the veterinary hospital because of lameness.12,13 Obese cats were also 5 times as likely to develop lameness requiring veterinary care.
As the only risk factor for osteoarthritis that can be managed, obesity is a prime target of treatment.
Stages of Osteoarthritis
Osteoarthritis has 4 stages.14 These stages are more easily defined for dogs.
- Stage 1: Patient experiencing early signs that are often difficult to identify. These signs are most common in growing dogs or young adult dogs and are typically sporadic, lasting a few seconds/minutes.
- Stage 2: Patient experiencing intermittent signs, which are considered the first flare-ups. These signs are intermittent, lasting a few hours, and are easy for owners to rationalize and ignore. This stage is typically seen in young adult dogs.
- Stage 3: Patient experiencing performance impairment. This stage, characterized by exercise intolerance and progressive loss of the ability to perform activities of daily living, is more recognizable by the owner. This stage is often seen in adult dogs.
- Stage 4: Patient experiencing loss of mobility along with loss of strength and fitness. This stage is much harder for the owner to manage.
It is important to remember that both young and old dogs can be in any of these stages. Historically, most dogs with osteoarthritis have been diagnosed in stage 3 or 4. Ideally, veterinary teams must be cognizant of and recognize the signs of osteoarthritis in the earlier stages.
Clinical Signs of Osteoarthritis
Clinical signs of arthritis include difficulty rising from rest, stiffness, or lameness. A thorough disease-specific history taken at every visit may reveal evidence of subtle changes early in the course of osteoarthritis, such as reluctance to walk, run, climb stairs, jump, or play.15 Consistent use of an owner questionnaire may facilitate early detection of osteoarthritis.
In dogs, signs may be as inconspicuous as lagging behind on walks, reluctance to walk on tile or hardwood floors, and no longer wanting to go for car rides, if that was once a favorite activity. Yelping, whimpering, and personality changes such as withdrawal or aggressive behavior may be indicative of the chronic pain of osteoarthritis. Veterinary teams must listen to owners when they describe such behavior changes and recognize their significance, as owners are often unaware of the correlation between behavior changes and arthritis.
Additionally, the veterinary team may uncover subtle signs unnoticed by the owner, such as longer nails, indicating the dog is not walking and the nails are not being “worn” by hard surfaces, or abnormal fur patterns over joints, indicating the dog has been licking the area, which is often due to osteoarthritis pain.
Recognizing signs of osteoarthritis in cats is much more difficult. Cats often suffer in silence, and the veterinary healthcare team must rely upon the owner’s evaluation and a thorough history to discover potential signs of osteoarthritis. Often, the changes noted by owners fall into 4 categories:
- Mobility. Mobility changes include reluctance to jump, not jumping as high, and changes in toileting behavior due to inability to climb into the litter box.
- Activity level. Activity level changes manifest in decreased playing and hunting and a change in sleep patterns.
- Grooming. Grooming changes may be noticed when the cat develops mats in its fur or is unable to groom certain areas. Claws may be overgrown because the cat cannot stretch out to scratch.
- Temperament. Changes in temperament are demonstrated by the cat hiding from owners or other pets in the house and seeming “grumpy.”15,16
Many of these signs are attributed to “old age” in the cat by the owner. Thus, it is important for the veterinary nurse to take a thorough history and ask open-ended questions that may help uncover otherwise overlooked signs of osteoarthritis. It is also important to remind cat owners that old age, in and of itself, is not a disease.
Diagnosis of Osteoarthritis
Diagnosis of osteoarthritis involves a combination of history, physical examination findings, and radiographic evidence of joint disease, particularly in dogs. In cats, the history taken with the pet owner plays a significant role. Because historical clues, although essential to creating an index of suspicion, may be elusive and clinical signs may be subtle on routine veterinary examination, veterinary nurses play an extensive role in assessing and managing joint disease.
Obesity and Osteoarthritis
In 2018, the Association for Pet Obesity Prevention found nearly 56% of dogs and 60% of cats to be clinically overweight or obese.17 Pets that are overweight or obese are at higher risk for osteoarthritis, with one long-term study finding the prevalence of osteoarthritis to be greater in overweight or obese dogs than in ideal-weight dogs (83% versus 50%).9,15 Given these statistics, it is reasonable to assume a significant portion of arthritic pets will be overweight or obese and vice versa. Managing these comorbid conditions presents a variety of challenges.
Role of Obesity in Osteoarthritis
Historically, the stress of excess weight on the skeletal system was thought to be the primary offender in the pathophysiology and progression of osteoarthritis. Now, adipose tissue is no longer considered simply a storage site for energy; rather, it is recognized as a multifunctional organ that plays an active role in a variety of homeostatic and pathologic processes.18
Recent studies have found that adipocytes secrete several hormones, including leptin and adiponectin, and produce a diverse range of proteins called adipokines. Among the currently recognized adipokines is a growing list of mediators of inflammation: tumor necrosis factor-α, interleukin-6, interleukin-8, and interleukin-10.18 These adipokines are found in human and canine adipocytes. Their production is increased in obese animals, suggesting that obesity is a state of chronic low-grade inflammation. Low-grade inflammation may contribute to the pathophysiology of a number of diseases commonly associated with obesity, including osteoarthritis. This might explain why relatively small reductions in body weight can result in significant improvement in clinical signs of osteoarthritis.
Diagnosis of Obesity
Osteoarthritis and obesity present diagnostic challenges for very different reasons. Clinical signs of osteoarthritis are often not obvious on examination, particularly early in the disease process. Signs of overweight and obesity may be readily apparent, but are often overlooked or dismissed as insignificant. Diagnosing obesity is of the utmost importance to initiating diagnostic, curative, and preventive strategies that may be otherwise lost.
The first step to diagnosing overweight/obesity is consistent recording of both body weight and body condition score (BCS) at every examination. Body weight alone does not indicate how appropriate the weight is for an individual animal. The BCS is a subjective assessment of an animal’s body fat that takes into account the animal’s frame size independent of its weight, thus putting body weight in perspective for each specific patient. For example, a Labrador retriever weighing 30 kg may be underweight, optimal weight, or overweight.
One long-term study found that the prevalence and severity of osteoarthritis were greater in dogs with a BCS above normal compared with dogs maintained at an ideal body condition throughout life.19 Over the life span of these same dogs, the mean age at which 50% of the dogs required treatment for pain attributable to osteoarthritis was significantly earlier (10.3 years, P <0.01 ) in the overweight dogs than in the dogs with normal BCS (13.3 years).19
In both human and veterinary medicine, timely identification of obesity by primary care providers remains the crucial initial step in management.
Risk Factors for Obesity
Risk factors for obesity in dogs include age; breed; neuter status; consumption of a semi-moist, homemade, or canned food as the major diet source; and consumption of “other” foods such as treats or table scraps. Dogs found to be overweight at 9 to 12 months of age were 1.5 times more likely to become overweight adults.20-23 Golden retrievers, Rottweilers, pugs, and Labrador retrievers are overrepresented in the population of overweight and/or obese dogs.24 Owners of dogs at risk for obesity and osteoarthritis should be educated on the importance of lifelong weight management.
Treatment of Obesity
Understanding the correlation between maintaining their pet at a healthy weight and decreasing the risk of disease may be a powerful motivator for many owners. The benefits of maintaining optimal weight are quite clear and of utmost importance. In the author’s opinion, a high BCS, in all probability, dramatically and negatively affects a pet’s propensity for osteoarthritis and severity of disease. In overweight pets with osteoarthritis, weight loss should be a primary treatment rather than an afterthought.2
Physical activity levels of dogs and cats often mirror levels in their human companions. Owners should be encouraged to respond with play activities or praise rather than food rewards. An exercise regimen should be instituted for all overweight or obese patients. Instituting a weight management clinic in the practice can help with creating individual patient plans and encouraging owner compliance.24
Treatment of Osteoarthritis
Despite being considered the most common chronic pain condition in dogs and cats, osteoarthritis is difficult to recognize early and inevitably progressive, making it challenging to treat. The objectives of treatment are multidimensional:
- Reduce pain and discomfort
- Decrease clinical signs
- Slow the progression of the disease
- Promote the repair of damaged tissue
- Improve the pet’s quality of life
As with many conditions, the best results come from a multimodal approach. In patients with osteoarthritis, this approach includes a combination of anti-inflammatory and analgesic medications, disease-modifying osteoarthritis agents, nutraceuticals, weight reduction, exercise programs, physical therapy, and nutrition. Applying an individualized combination of these management options to each patient will enhance quality of life, which is the ultimate goal of therapy.
Nutritional Management of Osteoarthritis
As with many disease conditions, nutrition plays a role in managing joint disease. Nutritional factors can modify some of the underlying processes involved in arthritis, including modulation of the inflammatory response, provision of nutrients for cartilage repair, and protection against oxidative damage. Additionally, nutritional management may help to reduce or eliminate the need for conventional drugs, some of which are associated with adverse secondary effects. Veterinary nurses must understand how certain nutrients play a role in managing osteoarthritis, whether these nutrients are provided separately or are part of a food aimed at managing osteoarthritis.
Omega-3 Fatty Acids
As mentioned earlier, immunoregulatory eicosanoids derived from EPA (an omega-3 fatty acid) promote minimal to no inflammatory activity, in contrast to those produced from AA (an omega-6 fatty acid).7 However, AA is the principal precursor for eicosanoids, and EPA competes with AA for the same enzyme systems. Ingestion of foods containing omega-3 fatty acids results in a decrease in membrane AA levels because omega-3 fatty acids replace AA in the substrate pool. This produces an accompanying decrease in the capacity to synthesize eicosanoids from AA. Studies have documented that inflammatory eicosanoids produced from AA are depressed when dogs consume foods with high levels of omega-3 fatty acids.
Omega-3 fatty acids also play a direct role in the resolution of inflammation. This process involves a switch in the production of lipid-derived mediators over time, from proinflammatory products of omega-6 fatty acid metabolism to pro-resolution omega-3 derived mediators known as resolvins and protectins.25 These mediators act in several ways, including preventing inflammatory cell recruitment and removing inflammatory cells from the site. The identification of resolvins and protectins may clarify the mechanisms that underlie the many reported benefits of dietary omega-3 fatty acids. Absence of sufficient dietary levels of omega-3 fatty acids may contribute to “resolution failure” and perpetuation of chronic inflammation, so long-term omega-3 supplementation may be consideration for osteoarthritis patients.
The ratio of omega-3 to omega-6 fatty acids in therapeutic osteoarthritis diets for dogs is <1:1. However, this ratio should be interpreted with caution because it does not reflect the total amount or the type of omega-3 fatty acids present in the diet. Some therapeutic osteoarthritis diets contain adequate amounts of n-3 fatty acids, and additional supplementation is not needed. However, each therapeutic diet approaches management differently; therefore, when discussing nutritional management with owners, veterinary nurses should be familiar with the nutritional profile of each product and how it approaches osteoarthritis management.
When it comes to omega-3 supplements, not all are created equally, and not all are intended for use in dogs and/or cats. To help ensure that any supplement used is appropriate for a given pet, the author recommends using those from veterinary companies that have research and scientific evidence behind them.
Important potential adverse effects of omega-3 fatty acid supplementation to watch for in veterinary patients include altered platelet function, gastrointestinal adverse effects, unfavorable effects on wound healing, lipid peroxidation, weight gain, altered immune function, and effects on glycemic control and insulin sensitivity.26
Nutritional supplementation of omega-3 fatty acids should be part of the management of dogs with osteoarthritis. Four randomized, double-blinded, controlled clinical trials using client-owned dogs support the use of one therapeutic diet with high levels of total omega-3 fatty acids and EPA to improve the clinical signs of canine osteoarthritis.27-30 In total, more than 500 dogs with osteoarthritis were studied. Participating dogs were diagnosed with osteoarthritis based on history, clinical signs, and radiographic evidence and were fed either a typical commercial dog food or the therapeutic diet, which had higher concentrations of total omega-3 fatty acids and EPA and lower omega-3:omega-6 fatty acid ratios. Subjective and objective veterinary evaluations and subjective owner evaluations were used to assess the dogs’ responses.
EPA can also considerably decrease the loss of aggrecan in canine cartilage. In normal canine cartilage, synthesis and degradation of cartilage matrix are balanced processes. In arthritic joints, damage to chondrocytes leads to inflammation, pain, and the destruction of cartilage. EPA inhibits the upregulation of cartilage-degrading enzymes by blocking the signal at the level of messenger ribonucleic acid.31,32
Nutritional supplementation of omega-3 fatty acids should also be part of overall management of cats with osteoarthritis. As in dogs, high levels of these acids control inflammation in cats; however, in cats, docosahexaenoic acid (DHA) is the inhibitor of the enzymes responsible for cartilage degradation.14,33
The efficacy of therapeutic nutrition for cats with osteoarthritis is also supported by research.34-36 One study looking at therapeutic nutrition containing high levels of DHA, natural sources of glucosamine and chondroitin, methionine, and manganese found that veterinarian-assessed arthritis scores improved in 70% (33/47) of cats and owner-evaluated mobility scores improved in 96% (45/47) of cats after 1 month of therapy.34
Another randomized, controlled clinical trial looked at this same therapeutic nutritional profile in cats with moderate to severe arthritis.35 Alterations in both the ability to jump and the height of jump were the most frequent signs of disease. After 1 month of therapy, 61% of owners noted marked improvement in their cat’s clinical signs. Activity monitors worn by the cats documented significant increases in activity in the cats on the osteoarthritis diet. This study also evaluated a variety of biomarkers. Cats on the osteoarthritis diet had decreased biomarkers and metabolomic markers of inflammation and cartilage degradation.
Shellfish supplements have been used to manage arthritis in humans, and, in recent years, interest has focused on the potential benefits of a nutritional supplement prepared from the New Zealand green-lipped mussel (GLM), Perna canaliculus.37 GLM is known to contain anti-inflammatory components and other nutrients that benefit joint health; however, heat processing has been shown to destroy its activity. Therefore, GLM processing and incorporation into food products require special techniques.
GLM is a rich source of nutrients, including glycosaminoglycans, vitamins, minerals, and omega-3 fatty acids. GLM has been shown to contain a unique omega-3 fatty acid, eicosatetraenoic acid, which appears to inhibit AA oxygenation and, therefore, inflammatory response through 2 different pathways.38-40
A study of a therapeutic food containing GLM for cats with osteoarthritis found that owners of cats in both the study and control groups reported improved mobility in their cats.41 However, differences were reported between the groups in the activity monitor data. Activity monitors indicated a significant decline in activity in the control diet group and a significant increase in activity in the therapeutic nutrition group. The finding of decreased activity in the control group was unexpected and the cause unidentified.
Amino acids, the building blocks of proteins, play a role in the structure of tissues and organs. Methionine is an amino acid that also produces several important molecules essential for the proper functioning of cells. Methionine is a building block for cartilage and protein synthesis and aids in maintaining the viability of chondrocytes.42
Carnitine is a crucial amino acid that facilitates the conversion of fat into energy.14 Carnitine aids in maintaining muscle and transporting long-chain fatty acids and their derivatives into the mitochondria of cells. The severity of joint disease may be lessened by strengthening skeletal muscle and turning fat into energy.
Hyaluronic acid. Hyaluronic acid is a principal component of synovial fluid that works to preserve joint viscosity, support lubrication of the joint, and aid in shock absorption.
Antioxidants. Antioxidants, like vitamins C and E, neutralize free radicals to increase mobility.
N-Acetyl D-glucosamine. This polysaccharide “shortcuts” the glycosaminoglycan pathway to maintain healthy joint structure and function.
Manganese. Manganese is an essential nutrient involved in numerous chemical processes in the body, including bone formation. In joints, manganese supports the health and maintenance of bone and cartilage as well as collagen formation. Like methionine, manganese is a building block of cartilage and supports chondrocyte viability.
Prevention and successful treatment of osteoarthritis require a comprehensive, multimodal strategy, of which therapeutic nutrition is an effective, safe component supported by multiple clinical studies and trials in arthritic pets. Documenting a diagnosis of overweight/obesity is critical. Early diagnosis of osteoarthritis and developmental orthopedic disease enables early intervention, which often improves the long-term outcome for the patient. Consistent use of a thorough, disease-specific history questionnaire may raise awareness of subtle changes early in the course of osteoarthritis.
1. Mele E. Epidemiology of osteoarthritis. Vet Focus 2007;17:4-10. doi: 10.1055/s-0034-1381772
2. Epstein ME. Managing chronic pain in dogs & cats part 1: the two most important tools in the treatment of osteoarthritis. Todays Vet Pract 2013;3(6):20-23.
3. Anandacoomarasamy A, Caterson I, Sambrook P, et al. The impact of obesity on the musculoskeletal system. Int J Obes (Lond)
2008;32:211-222. doi: 10.1038/sj.ijo.0803715
4. Johnston SA. Osteoarthritis—joint anatomy, physiology, and pathobiology. Vet Clin North Am Small Anim Pract 1997;27:699-723. doi: 10.1016/S0195-5616(97)50076-3
5. Anderson KL, O’Neill DG, Brodbelt DC, et al. Prevalence, duration and risk factors for appendicular osteoarthritis in a UK dog population under primary veterinary care. Sci Rep 2018;8:5641. doi: 10.1038/s41598-018-23940-z
6. Lascelles BD, Robertson SA. DJD-associated pain in cats: what can we do to promote patient comfort? J Feline Med Surg 2010;12:200-212. doi: 10.1016/j.jfms.2010.01.003
7. Wander RC, Hall JA, Gradin JL, et al. The ratio of dietary (n-6) to (n-3) fatty acids influences immune system function, eicosanoid metabolism, lipid peroxidation and vitamin E status in aged dogs. J Nutr 1997;127:1198-1205. doi: 10.1093/jn/127.6.1198
8. Paster ER, LaFond E, Biery DN, et al. Estimates of prevalence of hip dysplasia in golden retrievers and rottweilers and the influence of bias on published prevalence figures. JAVMA 2005;226(3):387-392. doi: 10.2460/javma.2005.226.387
9. Kealy RD, Lawler DF, Ballam JM, et al. Evaluation of the effect of limited food consumption on radiographic evidence of osteoarthritis in dogs. JAVMA 2000;217:1678-1680. doi: 10.2460/javma.2000.217.1678
10. Impellizeri JA, Tetrick MA, Muir P. Effect of weight reduction on clinical signs of lameness in dogs with hip osteoarthritis. JAVMA 2000;216:1089-1091. doi: 10.2460/javma.2000.216.1089
11. Lund E, Armstrong J, Kirk C, et al. Prevalence and risk factors for obesity in adult dogs from private US veterinary practices. Int J Appl Res Vet Med 2006;4:177-186.
12. Scarlett JM, Donoghue S. Associations between body condition and disease in cats. JAVMA 1998;212:1725-1731.
13. Öhlund M, Palmgren M, Ström Holst B. Overweight in adult cats: a cross-sectional study. Acta Vet Scand 2018;60:5. Published online 2018 Jan 19. doi: 10.1186/s13028-018-0359-7
14. Bland SM. Canine osteoarthritis and treatments: a review. Vet Sci Dev 2015;5:5931. doi: 10.4081/vsd.2015.5931
15. Burns KM. Are your patients suffering in silence? Managing osteoarthritis in pets. NAVTA J Convention Issue. 2011:16-22.
16. Bennett D, Morton C. A study of owner observed behavioural and lifestyle changes in cats with musculoskeletal disease before and after analgesic therapy. J Feline Med Surg 2009;11(12):997-1004. doi: 10.1016/j.jfms.2009.09.016
17. Association for Pet Obesity Prevention. petobesityprevention.org. Accessed April 24, 2020.
18. Towell TL, Burns KM. Multimodal management of osteoarthritis. NAVC Proceedings 2011.
19. Smith GK, Paster ER, Powers MY, et al. Lifelong diet restriction and radiographic evidence of osteoarthritis of the hip joint in dogs. JAVMA 2006;229(5):690. doi: 10.2460/javma.229.5.690
20. Eby J, Colditz G. Obesity/overweight: prevention and weight management. In: Quah S, Heggenhougen K, eds. International Encyclopedia Of Public Health. St. Louis, MO: Elsevier; 2008:602-609.
21. Kienzle E, Bergler R, Mandernach A. A comparison of the feeding behavior and the human-animal relationship in owners of normal and obese dogs. J Nutr 1998;128:2779S-2782S. doi: 10.1093/jn/128.12.2779S
22. Anandacoomarasamy A, Fransen M, March L. Obesity and the musculoskeletal system. Curr Opin Rheumatol 2009;21:71-77.
23. Christensen R, Bartels EM, Astrup A, Bliddal H. Effect of weight reduction in obese patients diagnosed with knee osteoarthritis: a systematic review and meta-analysis. Ann Rheum Dis 2007;66:433-439. doi: 10.1136/ard.2006.065904
24. Ackerman N. Elements of a successful weight management clinic. Todays Vet Nurse 2020;3(4):18-22.
25. Balić A, Vlašić D, Žužul K, et al. Omega-3 versus omega-6 polyunsaturated fatty acids in the prevention and treatment of inflammatory skin diseases. Int J Mol Sci 2020;21:741. doi:10.3390/ijms21030741
26. Lenox CE, Bauer JE. Potential adverse effects of omega-3 Fatty acids in dogs and cats. J Vet Intern Med 2013;27(2):217-26. doi: 10.1111/jvim.12033.
27. Roush JK, et al. Multicenter practice assessment of the effects of omega-3 fatty acids on osteoarthritis in dogs. JAVMA
2010;236(1):59-66. doi: 10.2460/javma.236.1.59
28. Fritsch D, Allen TA, Dodd CE, et al. Dose-titration effects of fish oil in osteoarthritic dogs. J Vet Intern Med 2010;24:1020-1026. doi: 10.1111/j.1939-1676.2010.0572.x
29. Roush JK, Cross AR, Renberg WC, et al. Evaluation of the effects of dietary supplementation with fish oil omega-3 fatty acids on weight bearing in dogs with osteoarthritis, 3-month feeding study. JAVMA 2010;236(1):67-73. doi: 10.2460/javma.236.1.67
30. Fritsch DA, Allen TA, Dodd CE, et al. A multi-center study of the effect of dietary supplementation with fish oil omega-3 fatty acids on carprofen dosage in dogs with osteoarthritis. JAVMA 2010;236:535-539. doi: 10.2460/javma.236.5.535
31. Caterson B, Flannery CR, Hughes CE, Little CB. Mechanisms involved in cartilage proteoglycan catabolism. Matrix Biol 2000;19:333-344.
32. Caterson G. Omega-3 fatty acids—incorporation in canine chondrocyte membranes. Unpublished data. Cardiff University, Wales, UK. 2004.
33. Burns KM. Nutritional counseling. In: Goldberg ME, Tomlinson JE, eds. Physical Rehabilitation for Veterinary Technicians and Nurses. 2018. Ames, IA: Wiley Blackwell; 2018:109-126.
34. Sparkes A, Debraekeleer J, Hahn KA. An open-label, prospective study evaluating the response to feeding a veterinary therapeutic diet in cats with degenerative joint disease. J Vet Intern Med 2010;24:771.
35. Fritsch D, Allen TA, Sparkes A, et al. Improvement of clinical signs of osteoarthritis in cats by dietary intervention. J Vet Intern Med 2010;24:771-772.
36. Frantz NZ, Hahn K, MacLeay J, et al. Effect of a test food on whole blood gene expression in cats with appendicular degenerative joint disease. J Vet Intern Med 2010;24:771.
37. Bui LM, Bierer TL. Influence of green lipped mussels (Perna canaliculus) in alleviating signs of arthritis in dogs. Vet Ther 2001;2:101-111.
38. Treschow AP, Hodges LD, Wright PF, et al. Novel anti-inflammatory omega-3 PUFAs from New-Zealand green-lipped mussels, Perna canaliculus. Comp Biochem Physiol B Biochem Mol Biol 2007;147:645-656. doi: 10.1016/j.cbpb.2007.04.004
39. Halpern GM. Anti-inflammatory effects of a stabilized lipid extract of Perna canaliculus (lyprinol). Allerg Immunol 2000;32:272-278.
40. Eason CT, Adams SL, Puddick J, et al. Greenshell™ mussels: a review of veterinary trials and future research directions. Vet Sci 2018;5:36.
41. Lascelles BDX, DePuy V, Thomson A, et al. Evaluation of a therapeutic diet for feline degenerative joint disease. J Vet Intern Med 2010;24:487-495. doi: 10.1111/j.1939-1676.2010.0495.x
42. Hall AC. The role of chondrocyte morphology and volume in controlling phenotype-implications for osteoarthritis, cartilage repair, and cartilage engineering. Curr Rheumatol Rep 2019;21(8):38. doi:10.1007/s11926-019-0837-6
The article you have read has been submitted for RACE approval for 1 hour of continuing education credit and will be opened for enrollment when approval has been received. To receive credit, take the approved test online for free on VetFolio. Free registration is required. Questions and answers online may differ from those below. Tests are valid for 2 years from the date of approval.
The goals of medical management of osteoarthritis (OA) include: (1) mitigation of risk factors, (2) controlling clinical signs, (3) moderating progression of the disease, and (4) improving the pet’s quality of life. Nutrition plays a critical role in the successful long-term management of patients with OA. Prevention or reversal of obesity is one of the most effective mechanisms for reducing risk and modifying disease progression. Nutrients and their role in managing OA are presented and show how nutrition helps to mitigate pain and slow the progression of OA.
Identify the goals of managing OA in cats and dogs, describe specific nutrients and their effect on OA, and identify and communicate risk factors for OA in cats and dogs.
1. Age-specific prevalence values range from __ in dogs older than 1 year up to __ in dogs older than 8 years.
a. 20%, 33%
b. 80%, 20%
c. 20%, 80%
d. 33%, 90%
2. Which is considered the most common chronic pain condition in dogs and cats?
c. Chronic kidney disease
3. Which of the following is not a typical clinical sign of advanced arthritis in dogs?
a. Changes in grooming
d. Difficulty in rising
4. Which of the following is not a treatment objective for osteoarthritis?
a. Reduce pain and discomfort
b. Decrease clinical signs
c. Slow the progression of the disease
d. Delay the repair of damaged tissue
5. Symptoms of osteoarthritis in cats are generally categorized into 4 groups, not including:
b. Activity level
d. Eating habits
6. Which is not a risk factor for pets to develop osteoarthritis?
7. In cats, which fatty acid inhibits the aggrecanase enzymes responsible for cartilage degradation?
8. Which of the following works in the joint to preserve joint viscosity, support lubrication of the joint, and aid in shock absorption?
b. Hyaluronic acid
9. Which amino acid facilitates turning fat into energy?
10. In studies, obese cats were ____ times as likely to develop lameness requiring veterinary care.