THE TREATMENT OF OSTEOARTHRITIS WITH CHINESE HERBAL MEDICINE A Narrative Literature Review Chris Wilson Abstract This is a narrative literature review to give insight into whether Chinese herbal medicine (CHM) is a valid form of treatment for osteoarthritis (OA). Current western medical thought is migrating away from classifying OA as an aging related disease to one caused by loading and frequency of joint use. TCM considers OA to be bi syndrome where qi and blood stagnation manifests locally at the joints. The deformity is a result of fluid accumulation and long term blood stagnation that leads to malnutrition and eventual deformity of the joints. Pubescent Angelica and Taxillus Decoction (du huo ji sheng tang) was found to be the most commonly prescribed formulae with the greatest volume of research. Results were constantly positive, but a large scale trial would be desirable. and wears away, the bones rub together. This causes the pain, swelling, and stiffness of OA. As OA worsens, bony spurs or extra bone may form around the joint. The ligaments and muscles around the joint may become weaker and stiffer”. (U.S. National Library of Medicine, 2015) It is apparent from these definitions that there is a lack of clarity in relation to the structural, functional and pain aspects of OA. Further confusion is created since the highest incidence of OA is in the hand joints yet most of the research is based around the knee. (Pereira, et al., 2011) Three standards, WOMAC (Rheumatology, 2015), SF-36 (Optimum.com, 2015) and VAS (Gillian A. Hawker*, 2011) can be applied to measure clinical outcomes. Prevention Keywords has been mainly focused on comorbidity factors such Traditional Chinese Medicine, TCM, Chinese Herbal as weight loss (Vincent, et al., 2012) dietary supplements Medicine, Osteoarthritis, OA, Bi Syndrome, Literature (Neil, et al., 2005) and exercise. (Valderrabano & Steiger, Review, du huo ji sheng tang 2011) Contra to the body of evidence that exercise is beneficial to the management of OA (Uthman, et al., 2013) a study revealed that there is a high prevalence INTRODUCTION of OA in rural workers who by the nature of their occupation do more exercise and have a lowered OA is defined by the NHS as “a condition that causes the prevalence of obesity. (Kang, et al., 2009) (Arthritis joints to become painful and stiff. It is the most common Research Campaign, 2005) Although some work has type of arthritis in the UK”. (NHS, 2015) NICE defines been done (Neumann & Cook, 1985) (Kujala, et al., 1994) OA as “a clinical syndrome of joint pain accompanied to investigate loads on joints more research is required to by varying degrees of function limitation and reduced ascertain which weight bearing loads lead to OA. quality of life”. (NICE, 2014) Arthritis Care defines OA A geographical study in France linked the distribution as “changes in cartilage that affect how joints work”. of OA incidence to obesity (Guillemin, et al., 2011). (Athritis Care, 2015) The US National Library of Medicine However, there are too few cases to study risk factors for defines OA as “When cartilage breaks down disease onset. (Felson & Nevitt, 2004) The Register of Chinese Herbal Medicine Journal 39 Epidemiology Epidemiological studies have found that musculoskeletal diseases which include OA are one of the most common causes for long term pain and disability. It is estimated to be the fourth leading cause of disability. (Fransen, et al., 2011) The cost to the public health system can be broken into 3 areas: direct costs, indirect costs and intangible costs. (Chen, et al., 2012) Direct costs did not include any complementary medicines at all. NICE estimated the prevalence of OA in the UK to be a total of 2.8 million patients, based on symptomatic diagnosis in patients aged over 45 (NICE, 2014) with no estimates of undiagnosed patients, which could be paralleled with the US where 27 million people are diagnosed and 47 million people may be undiagnosed. (Caceres, 2010) A significant difference was made in cost saving for patients who were diagnosed and subsequently treated. (Carlo, et al., 2014) The World Health Organisation (WHO) has reported that “over one-third of the population in developing countries lack access to essential medicines. The provision of safe and effective Traditional / Complementary therapies could become a critical tool to increase access to healthcare”. (WHO, 2003). Despite the WHO recommendation, no expenditure on Complementary and Alternative Medicine (CAM) based interventions has been recommended, while the costs of OA are set to soar. CAM and costs of OA There is insufficient reliable evidence for the cost effectiveness of CAM based interventions. This was highlighted by the Smallwood report (Smallwood, 2005), which was further dissected by (Ernst, 2006) for inaccuracies and short comings. This does not mean that CAM is ineffective, it has just not been adequately researched. It is estimated that the direct costs of OA at adjusted 2010 prices were £19.2million for topical NSAID, £25.65million for oral NSAID, £98million for NSAID iatrogenesis , £11.6 million for proton pump inhibitor drugs, £1.3 million for arthroscopy and £852 million for joint replacement, which equates to £1007.75 million per year. This does not include indirect costs that in 2002 resulted in loss of economic production of £3.2 billion and £258 million in social services. A clear need for better quality of data for OA is needed. (Chen, et al., 2012) These numbers are set to significantly increase with the aging population where one in five people will be over 65 by 2030. (Oliver, et al., 2014) Aetiology 40 An understanding of the aetiology of OA relied on a number of earlier papers (Murray, 1964) (Isdale, 1975) (Fergusson, 1987) until a more recent discussion by Weiss. (Weiss, 2007) OA is considered to be the most ubiquitous pathological musculoskeletal condition. Previous definitions did not include inflammation but are now considered crucial to the pathogenesis of OA (Punzi, et al., 2005). A number of palaeopathological / palaeoepidemiological studies by anthropologists have revealed that the cause of historical OA is from repetitive mechanical loading from continued use of specific muscles and joints in day to day tasks, corroborated by Kang. (Kang, et al., 2009) This was a study on a modern population of subsistence farmers in China with low incidence of obesity and high prevalence of OA. Modern aetiology considers genetics, anatomical issues, Body Mass Index and mechanical lifestyle as the primary causes of OA. The NICE guidelines (NICE, 2014) fail to adequately address these preventative issues as their guidelines only focus on weight loss, braces/supports and fitness training. A series of genetic screening tests have been developed which could be implemented. (Weiss, 2007) Anatomical issues could be addressed with chiropractic and osteopathic interventions. (Beyerman, et al., 2006) Mechanical lifestyle could improve with workplace assessments and ergonomic interventions. (Palmer, 2012) (Baldwin, et al., 2012) Larger studies have been conducted which support the conclusion that OA can be linked to an occupation and is not an inevitable disease of aging. (Rossinghnol, et al., 2003) Chinese Medicine Understanding of OA OA is categorised as bi syndrome, in particular bi syndrome of the bone and Kidney. (Ni, 1995) (Maciocia, 2005) Bi syndrome’s main etiological classifications are wind bi, cold bi, damp bi and heat bi which can affect the five tissues, fu organs and zang organs. (Vagermeersh & Pei-Lin, 1994) The circulation of qi and blood are obstructed by an externally invading pathogen which is indicated by stiffness, numbness and/or pain in the joints. The external pathogens penetrate the skin via the pores where they can affect the whole jing luo system and results in peripheral blockages of qi and blood circulation. In OA pain is a result of excess and/or deficiency which can manifest in stabbing, distending, contracting and severe pain. Alternatively it can be dull, intermittent and mild or a mix of both. Numbness can be as a result of both conditions where damp has accumulated or there has been deficiency of qi and blood to the joints. Limited mobility is a result of the qi and The Register of Chinese Herbal Medicine Journal blood blockages locally. The deformity of joints is a result of fluid accumulation and long term blood stagnation that leads to malnutrition and eventual deformity of the joints. It has been suggested that OA in the initial stages is bi syndrome but the later stages of atrophy of the muscles could be considered a major feature of wei syndrome. (Hua & O’Brien, 2010) There is further speculation that because the Kidney begins to decline (Ni, 1995) there will be a resulting decline in the blood which leads to OA being linked with age (Hua & O’Brien, 2010) but other epidemiological studies have shown that OA may not be linked to age but work environment and lifestyle which raises important questions regarding the focus on the Kidney. (Rossinghnol, et al., 2003) From a zang fu perspective bi syndrome is considered to be a depletion of the Kidney and Liver that allows for external pathogenic invasion. (Hua & O’Brien, 2010) concluded that the 2 main agreed diagnostic zang fu organs were the Spleen 23.1% and the Kidney 12.8% but the sample size was not sufficient to justify that claim. Traditional interpreted zang fu theory does state that Kidney and Liver have a common source that combine with the Spleen to form blood. (Maciocia, 2005) It was noted that the top 3 zang Organs referred to were Kidney (70%), Liver (42.5%), and Spleen (35%). (Hua & O’Brien, 2010) Methodology Databases searched were RCHM, JSTOR, PubMed, MEDLINE, Cochrane, Google Scholar, EMBASE, Google and Bing. English language sources were used. Animal trials were included. Keywords searched included OA, OA Chinese Medicine, OA Chinese Herbal Medicine, Rheumatoid Arthritis, DHJST, A narrative literature review & critique of papers was conducted and the following criteria for critiquing the papers was used: Conceptual framework: • Are the aims clearly stated and research questions clearly identified? • Does the author link the work to an existing body of knowledge? Study design: • Are the methods appropriate and clearly described? • Is the context of the study well set out? Did the research design account for possible bias? • Are the limitations of research explicitly identified? Research analysis: • • Are the results clearly described, valid and reliable? Is the analysis clearly described? Conclusions: • Are all possible influences on the observed outcomes considered? • Are the conclusions linked to the aims of study? • Are the conclusions linked to analysis and interpretation of data? Chinese Herbal Medicine (Chen, et al., 2014) analysed Taiwan’s national dataset for the prescription of herbal formulas used in the treatment of OA. They found the most prevalent formula prescribed was du huo ji sheng tang (DHJS) followed by Relax the Channels and Invigorate the Blood Decoction (shu jiang huo xie tang) and Tangkuei Decoction to Pry out Pain (dang gui nian tong tang). (Table 1 - The top 10 Chinese herbal formulae prescribed for OA in Taiwan during 2002). The most frequently used individual herbs were du zhong (Eucommia ulmoides Oliv.), xu duan (Dipsacus asperoides C.Y.Cheng & T.M. Ai), and niu xi (Achyranthes bidentate Blume). (Table 2 - The top 10 individual Chinese herbs prescribed for OA in Taiwan during 2002). (Chen, et al., 2014) Du Huo Ji Sheng Tang DHJS is the primary formulae used for Bi Syndrome (Chen, et al., 2014). It is contraindicated in strong excess conditions or damp heat. (Bensky, et al., 5 Mar 2009) The CAM report (Arthritis Research UK, 2014, p. 27) concluded that the effectiveness score was only 2/5 even though (Teekachunhatean, et al., 2004) found the formulae to have a NSAID effect and that it was as efficacious as diclofenac which is used as a second/ third line treatment in the NICE Guidelines. (NICE, 2014) (Arthritis Research UK, 2014) Both alluded to this even though it was the only research available, with at least 20 supporting papers for the formula and herbs. Follow up research was conducted to confirm anti-nociceptive and anti-inflammatory activities in animal models, however (Kunanusorn P, 2009) could not ascertain a significant result in another animal trial. DHJS was found to be slower acting than diclofenac with equal adverse reactions which was not proven. There are significant questions about the safety of long term NSAID treatment which was found to increase the rate of heart disease (Kearney PM, 2006) and adversely affect the kidneys. (Brater, 2002) Questions were raised about safety concerns with the inclusion of xi xin (Asarum heterotropoides Fr. Var. Mandshuricum (Maxim.) Kitag.). A four week study The Register of Chinese Herbal Medicine Journal 41 was conducted with xi xin (Hsieh, et al., 2010) which concluded that adverse effects were mild to moderate and did not exceed a mild 2 hour headache. Unlike the use of diclofenac no lifestyle or long term health issues were reported when using xi xin (Zheng, et al., 2013) but further research is required. Other formulas have had limited research with mixed results. Tortoise Shell and Deer Antler Two-Immortal Syrup (gui lu er xian jiao) showed a significant decrease in articular pain with OA. It is often said that the actions and interactions in Chinese herbal medicines are not understood but in the case of DHJS a molecular study has been conducted (Zheng, et al., 2013) which shows that it is drug-like and contains multi target synergistic diverse combinations binding to the OA targets. Du zhong was found to inhibit the PI3K/Akt pathway (an intracellular signalling pathway that has been found to degrade cartilage), to reduce inflammatory cytokines, delay cartilage degeneration and prevent MMP-3 secretion (matrix metalloproteinase-3 is a genetically encoded enzyme which is involved in tissue remodelling). (Guo-ping Xie, 2015) In the treatment of degenerative OA of the knee DHJS was found to reduce pain, stiffness and improve functioning. (Zheng CS1, 2007) DHJS treatment promotes chondrocyte proliferation. This may explain its clinical efficacy in the treatment of OA. (Wu, et al., 2013) Regardless of all this evidence (Vijitha De Silva, 2011) on behalf of the Arthritis Research UK group do not even acknowledge the existence of DHJS for OA and have inadequately evaluated DHJS for OA in other current reports. This raises the question of biases that are potentially shaping their recommendations instead of the clinical evidence of treatment and outcomes. Herbs APS-3c a polysaccharide extracted from du huo (Angelica pubescens Maxim f.f biserrata Shan & Yuan) was found to improve the synthesis of chondrocytes (cells that produce and maintain the cartilaginous matrix) and suggest the relevance of APS-3c in the treatment of OA. (Jun Qin, 2013) An intra-articular injection of du huo and sodium hyaluronate may reduce the degeneration of the cartilage. (Shiliang, 2009) There was also a protective effect on the treatment of rabbit knee arthritis (YI Jun, 2013) Water extract of niu xi showed remarkable inhibition of RANKL-treated osteoclasts (a type of membrane Shu Jing Huo Xue protein and member of the tumour necrosis factor (TNF) This is the second most widely used formulae (Chen, superfamily) that has been linked to the reduced risk of et al., 2014) that focuses primarily on moving blood, hip fracture. (Sato, et al., 2015) Water extract of niu xi relaxing the channels and moving blood with deficiency. suppressed pro-inflammatory cytokines (cells involved with signalling inflammation) and reduced bone erosion. It was found to potentially increase blood flow in rats by (Kim, et al., 2010) A follow up study was conducted the measure of tail surface temperature and locomotor to confirm that there was a therapeutic potential in activity. (Kanai, 2003) It was also found to reduce pain. inflammatory joint diseases. (Kim & Park, 2010) Alcohol (Shu H, 2010) extracts of niu xi have also shown the ability to decrease swelling and pain. (ZHAO Jia, 2008) Niu xi has been Dang Gui Nian Tong Tang found to be more effective when combined with hong This formula was shown to be ineffective as an antihua (Carthamus tinctorius L) in reducing inflammation, inflammatory and anti-hyperuricemic for arthritis (Chou activating blood circulation and dissipating blood stasis. & Kuo, 1995). It did however reduce blood uric acid (CHEN Hui, 2001) Niu xi has also been investigated to levels in mice with hyperuricemia which would correlate ascertain if it can direct diclofenac to target areas, with with the TCM theory of treating the Kidneys. some success. (LIN Yuequan, 2009) Other Formulas A study was done on the metabolic regulatory and anti-oxidative effects of modified bu shen huo xue tang on an experimental rabbit model of OA with some positive results. (Liu W, 2013) Fantastically Effective Pill to Invigorate the Collaterals (huo luo xiao ling) was also shown to have some positive results in a phase 2 human clinical trial. (Lixing Laoa, 2015) 42 Rou gui (Cinnamomum cassia Presl) was also found to have a chondroprotective effect (a compound or chemical that delays progressive joint space narrowing characteristic of OA) through anti-inflammatory and anti-apoptotic properties. (Kim, et al., 2013) Dang gui (Angelica sinensis, (Oliv.) Diels, Umbelliferae) has been found to have a hematopoietic effect on blood cells (hematopoietic stem cells are the blood cells The Register of Chinese Herbal Medicine Journal involved in the formation of blood cellular components) which could be consistent with providing the joint blood and fluid. (Gao QT, 2008) Ren shen (Panax Ginseng C.A. Mey.) has ginsenosides Rd and Rb3 which suppress MMP3 secretion (See Du Zhong above). Ginsenosides Rd and Rb3 are the major elements involved in the suppression of MMP3. The suppression of MMP3 occurs via the inhibition of phospho-p38 activation which may exert a protective effect against cartilage degradation. (Joon-Shik Shina, 2009) It is also suggested that ginsenosides inhibit matrix metalloproteinase-13 expression in articular chondrocytes which prevent cartilage degradation. (Je Hyeong Leea, 2013) Ren shen also modulates the levels of MMP3 in S12 murine articular cartilage cell line which may exert a protective effect against cartilage degradation. (Joon-Shik Shina, 2009) There was also a protective effect of ginsenoside Rb1 on hydrogen peroxide-induced oxidative stress in rat articular chondrocytes where inflammatory genes related to chondrocytes were reduced by approximately 50%. (Sokho Kim, 2012) Chondrocyte apoptosis has been recognized as an important factor in the pathogenesis of OA of which the anti-apoptotic activity of ginsenoside Rb1 in hydrogen peroxide-treated chondrocytes results in less cell damage around the joint. (Ji-Young Na, 2012) This has been confirmed by research in human trials. (Wendan Cheng, 2013) as randomization, control, quality of life (QOL), patient reported outcomes (PROs) and biomarkers, quality control, safety evaluation, sample size and bias have been noticeable in the clinic papers search. TCM has struggled in the past fitting to the RCT model because its diagnostic model is variable and dependant on the skill of the clinician with a number of approaches available. TCM pattern classification needs to be incorporated into research design, producing value-added clinical evidence to test the efficacy of TCM diagnostic and treatment principles. (Miao Jiang, 2010) This was attempted in (Hua, 2011) which used multiple clinicians to blindly diagnose patients then formulate an aggregate pattern diagnosis. Clinician sizes were too small and further research needs to be done on this method. Conclusion Classification issues around the aetiology and pathophysiology in western medicine hamper the overall treatment of OA. In TCM, research is commencing to evaluate the benefits of particular formulas and herbs. DHJS is the most researched and widely understood formula and as a result is the most assessed. The formula’s main herb du huo is one of the least researched for OA yet nui xi and ren shen are shown to be the most efficacious because of the volume of positive research findings. More research needs to done on the individual formula components and the interactions of the mixed herbs acting synergistically. Quality and relevance of papers More research is required on classifying OA outcomes and clinical results, in particular with long term follow Issues around the conduct of clinical trials in CHM, such up studies. Further research also needs to be done in the Chinese herbal formulae (Chinese name) Ingredients Du-­‐huo-­‐ji-­‐sheng-­‐tang Shu-­‐jiang-­‐hou-­‐xie-­‐tang Dang-­‐gui-­‐nian-­‐tung-­‐tang Liu-­‐wei-­‐di-­‐huang-­‐wan Ji-­‐sheng-­‐shen-­‐qi-­‐wan Chi-­‐po-­‐ti-­‐huang-­‐wan Kou-­‐qi-­‐di-­‐huang-­‐wan Xue-­‐fu-­‐chu-­‐yu-­‐tang Gui-­‐zhi-­‐shuo-­‐yao-­‐zhi-­‐mu-­‐tang Shou-­‐yao-­‐gan-­‐tsao-­‐tang Jia-­‐wei-­‐xiao-­‐yao-­‐san Number of prescriptions (%) Du-­‐huo, Sang-­‐ji-­‐sheng, Ren-­‐sen, Fu-­‐ling, Gan-­‐cao, Dang-­‐guei, Shao-­‐yao, 8,538 (26.6%) Chuan-­‐qiong, Di-­‐huang, Gui-­‐zhi, Du-­‐zhong, Niu-­‐xi, Xi-­‐xin, Fang-­‐feng, Qin-­‐jiao Dang-­‐gue, Gan-­‐cao, Shao-­‐yao, Di-­‐huang , Bai-­‐zhu, Niu-­‐xi, Chen-­‐pi, Tao-­‐ 7,804 (24.3%) ren, Wei-­‐ling-­‐xian, Chuan-­‐qiong, Fang-­‐ji, QGiang-­‐huo, Bai-­‐zhi, ZLhu-­‐ling, ong-­‐dan-­‐cao, Qiang-­‐huo, Yin-­‐chen-­‐hao, Huang-­‐qin, an-­‐cao, Zhi-­‐mu, Ze-­‐xie, 3,560 (11.1%) Fu-­‐ling, Sheng-­‐jiang Fang-­‐feng, Dang-­‐guei, Cang-­‐zhu, Ge-­‐gen, Ren-­‐sen, Ku-­‐sen, Sheng-­‐ma, Bai-­‐zhu Di-­‐huang, San-­‐zhu-­‐yu, Shan-­‐yao, Mu-­‐dan-­‐pi, Ze-­‐xie, Fu-­‐ling 2,779 (8.7%) Di-­‐huang, Shan-­‐yao, San-­‐zhu-­‐yu, Ze-­‐xie, Fu-­‐ling, Mu-­‐dan-­‐pi, Rou-­‐gui, Fu-­‐ 2,126 (6.6%) zi, Niu-­‐xi, Che-­‐qian-­‐zi Zhi-­‐mu, Huang-­‐bo, Di-­‐huang, San-­‐zhu-­‐yu, Shan-­‐yao, Ze-­‐xie, Mu-­‐dan-­‐pi, 2,081 (6.5%) Fu-­‐ling Gou-­‐ci, Ju-­‐hua, Di-­‐huang, San-­‐zhu-­‐yu, Shan-­‐yao, Ze-­‐xie, Mu-­‐dan-­‐pi, 1,904 (5.9%) Fu-­‐ling Dang-­‐guei, Di-­‐huang, Tao-­‐ren, Hong-­‐hua, Zhi-­‐shi, Shao-­‐yao, Chai-­‐hu, 1,702 (5.3%) Gan-­‐cao, Jie-­‐geng, Chuan-­‐qiong, Niu-­‐xi Gui-­‐zhi, Shao-­‐yao, Bai-­‐zhu, Zhi-­‐mu, Ma-­‐huang, Gan-­‐cao, Fang-­‐feng, Sheng-­‐jiang, Fu-­‐zi Shao-­‐yao, Gan-­‐cao 1,532 (4.8%) 1,411 (4.4%) Table 1 The top 10 Chinese herbal formulae prescribed for OA in Taiwan during 2002. (Chen, et al., 2014) Dang-­‐guei, Fu-­‐ling, Zhi-­‐zi, Bo-­‐he, Shao-­‐yao, Chai-­‐hu, Gan-­‐cao, Bai-­‐zhu, 1,249 (3.9%) Mu-­‐dan-­‐pi, Sheng-­‐jiang The Register of Chinese Herbal Medicine Journal 43 Chinese single herb (Chinese name) Generic name Number of prescriptions Percentage Xu-­‐duan Dipsacus asper 4,419 13.8% Du-­‐zhong Niu-­‐xi Mu-­‐gua Dan-­‐sen Ji-­‐xue-­‐teng Yan-­‐hu-­‐suo Wei-­‐ling-­‐xian Ru-­‐xiang Mo-­‐yao Gu-­‐sui-­‐pu Eucommia ulmoides Achyranthes bidentata Chaenomeles lagenaria Salvia miltiorrhiza Spatholobus suberectus Dunn Corydalis yanhusuo Clematis chinensis Osbeck Boswellia carterii Birdw. Commiphoramyrrha Engl. Drynaria fortune (Kunze) J. Sm. 5,005 3,763 11.7% 3,240 10.1% 3,115 9.7% 2,721 8.5% 2,494 7.8% 2,354 7.3% 1,715 5.4% 1,674 5.2% 1,569 About the Author Chris Wilson has been interested in the Chinese approach to health and well-being since studying Chinese martial arts in his early teen years. 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