- Research article
- Open Access
- Open Peer Review
Cost-effectiveness of surgical interventions for the management of osteoarthritis: a systematic review of the literature
BMC Musculoskeletal Disorders volume 18, Article number: 183 (2017)
The primary purpose of this study is to assess the existing evidence on the cost-effectiveness of surgical interventions for the management of knee and hip osteoarthritis by systematically reviewing published economic evaluation studies.
A systematic review was conducted for the period 2004 to 2016. Electronic databases were searched to identify both trial and model based economic evaluation studies that evaluated surgical interventions for knee and hip osteoarthritis.
A total of 23 studies met the inclusion criteria and an assessment of these studies showed that total knee arthroplasty (TKA), and total hip arthroplasty (THA) showed evidence of cost-effectiveness and improvement in quality of life of the patients when compared to non-operative and non-surgical procedures. On the other hand, even though delaying TKA and THA may lead to some cost savings in the short-run, the results from the study showed that this was not a cost-effective option.
TKA and THA are cost-effective and should be recommended for the management of patients with end stage/severe knee and hip OA. However, there needs to be additional studies to assess the cost-effectiveness of other surgical interventions in order for definite conclusions to be reached.
Osteoarthritis (OA) is the most common form of joint disease, and results from a progressive degenerative change in the joint structure. OA is associated with any joint in the body but the most commonly affected are the hip and the knee . It has been estimated that about 251 million people suffer from knee OA worldwide . The prevalence of OA increases with age, and with the constant rise in the global ageing population [3, 4], the economic burden of the disease is also likely to rise.
Osteoarthritis places a strain on scarce resources. For example, in a recent study, the total annual direct cost of osteoarthritis in the US was estimated to be double that of similar patients who did not have osteoarthritis . In the UK, the total health care cost of osteoarthritis is estimated at over £1 billion (2010 prices) . Based upon national survey data, Kortlarz et al. estimate the increased insurer expenditure for women in the US with osteoarthritis to be $4,833 . For men with osteoarthritis, the additional insurer cost was estimated as $4,036 . There is therefore a need for cost-effective approaches for the management of OA.
Treatment and management of OA involves a multidisciplinary approach and various management options include patient education and self-management, non-pharmacological treatments and pharmacological treatments. In the recently updated clinical guidelines for management of OA, issued by the National Institute for Health and Care Excellence (NICE), comprehensive and integrated care which involves healthcare professionals, patients and carers are among the key recommendations intended to ensure the maximum benefit for patients . Apart from these pharmacological and non-pharmacological interventions, there are also surgical interventions which are more expensive and are normally limited to those patients who do not respond to other forms of treatment. Due to the increase in the number of older people, there has been an increase in the demand for surgical interventions such as joint arthroplasty which has caused a rise in the costs associated with OA [9,10,11].
Systematic reviews have assessed the cost-effectiveness of pharmacological and non-pharmacological treatments for OA [12,13,14]. However to the best of our knowledge, a systematic review of economic evaluations assessing surgical interventions for the management of OA has never previously been published or reported. This study is therefore aimed at reviewing published economic evaluations aimed at assessing and summarizing evidence on the cost-effectiveness of surgical interventions for the management of OA. The focus is on knee and hip OA since they are the most common forms of OA.
The search and identification of papers followed a two-stage process. The initial search included economic evaluations associated with any clinical trials or cohort studies that assessed surgical, non-pharmacological and pharmacological interventions for all types of OA. This was necessary to meet the needs of the wider research project. The search strategy outlined below reflects this initial, broad scope.
Electronic databases (Ovid MEDLINE(R) In-Process & Other Non-Indexed Citations and Ovid MEDLINE(R), Ovid EMBASE Classic and EMBASE, EBM Reviews-Cochrane Database of Systematic Review, EBM Reviews-NHS Economic Evaluation Database, PubMed, INAHTA database and HTA websites) were searched for economic evaluations associated with any clinical trials or cohort-based trials that assessed all types of treatment modalities (pharmacological, non-pharmacological, surgical) for all types of OA.
Additional literature which was considered as potentially relevant was identified from the bibliographies of the retrieved articles and search engines such as Google Scholar. Any studies with limited access were retrieved by emailing the author(s) and no language restrictions were imposed. The searches were conducted between 2004 and 2016. This timeframe was chosen for pragmatic reasons and in order to capture the most recent studies. The detailed search terms that were used, has been outlined in Additional file 1.
Selection of studies
All titles and abstracts of retrieved articles were screened and any duplicates were excluded from the initial list. Each article was then checked for suitability in terms of their potential in assessing the cost-effectiveness and economic analysis of various treatment modalities for management of OA. Full text articles of these selected titles were retrieved and reviewed for further selection in accordance to pre-specified inclusion and exclusion criteria. The selection of articles was carried out independently by two reviewers [HK] and [RO]. Results from each reviewer were compared and any differences were resolved through consultation among reviewers.
It was from this broad pool of papers that the following, more specific, inclusion and exclusion criteria were applied, in order to identify studies falling within the scope of this paper.
The inclusion criteria for this systematic review were divided into 5 main components as follows:
Population: Patients with knee or hip osteoarthritis
Intervention: Surgical interventions (total knee arthroplasty, total hip arthroplasty etc).
Comparators: Any comparators (no interventions, usual care, and other surgical modalities)
Outcomes: Any outcomes for economic evaluations (cost effectiveness, incremental cost-effectiveness ratio or ICER)
Study design: Cost consequence analysis, cost-benefit analysis, cost-effectiveness analysis, cost-utility analysis both trial-based studies and model-based economic analysis
The exclusion criteria for this review were as follows:
Study designs that do not consider knee or hip OA or study designs that combine OA patients with other types of arthritis (rheumatoid arthritis, lupus arthritis, ankylosing spondylitis)
Partial or non-economic evaluation studies
Ongoing studies and protocol
Systematic reviews, narrative review, commentaries and letters
Data extraction and methods of analysis and synthesis
The following data was extracted from the selected studies: Study characteristics such as type of economic analysis, population, interventions, comparators, perspective, time horizon, and types of modelling used, effectiveness and cost measures, main results, ICER, base-case outcomes and sensitivity analyses being used. A summary of the studies relating to surgical interventions for the treatment of hip and knee OA is presented in Table 1.
Assessment of the quality of studies
Assessment of the quality of included studies was performed by using the Consolidated Health Economic Evaluation Reporting Standards or CHEERS  (Additional file 1) and Philips criteria checklist  (Additional file 1) for model based studies. All included studies were also quantitatively assessed using the Quality of Health Economic Studies (QHES) instrument (Additional file 1) which was designed to evaluate the appropriateness of the methodology, the validity and transparency of the study results and the comprehensiveness of reporting the study itself .
The initial (broad) search yielded 303 potentially relevant articles and after reviewing the abstracts and applying the inclusion criteria, 121 studies were initially included for full text review. After applying exclusion criteria set out above, a total of 98 articles were excluded, mainly because they were duplicates (6 studies), were not concerned with assessing surgical interventions (38 studies), not limited to knee and hip OA patients (19 studies), not full economic evaluations (22 studies), protocols (3 studies) and systematic reviews (10 studies). A total of 23 studies were included in the final sample for this paper (Fig. 1).
Summary of selected studies
All studies included in this review were published between 2004 and 2016 and were conducted across nine different countries (USA, Italy, Canada, Australia, Finland, UK, Singapore, Belgium and Romania). The types of economic evaluations conducted were mainly cost-utility analysis (78%) and cost-effectiveness analysis (13%) with one study conducting a cost-benefit analysis  and another conducting both a cost-utility analysis and a cost-effectiveness analysis . Sixteen studies were model based, whilst six were trial based (Table 1). Most studies adopted either a healthcare (nine studies) or a societal perspective (eight studies). Two studies however adopted both a healthcare and a societal perspective [19, 20]. Of the remaining studies, four did not specifically mention the perspective that was adopted [21,22,23,24].
Three studies only incorporated direct medical costs in their analysis even though they stated that they adopted a societal perspective [25,26,27]. Most studies described the comparators that were used; one study stated that the comparator of choice was a non-operative strategy  but did not give any specific details about the non-operative strategy used. For studies that used the QALY as an outcome measure, various health-related quality of life (HR-QoL) instruments such as the SF-36, EQ-5D, SF-6D, 15-Dimensional Utility Index (15D), Health Utility Index (HUI) and Health Assessment Questionnaire (HAQ) were used. Two studies [25, 29], however, did not specifically mention the tools that were used to derive the QALY estimates. Apart from the generic HR-QoL instruments, some studies utilised disease-specific health state instruments. For instance, Räsänen et al  used Harris Hip Score (HHS) and Knee Society Score (KSS) as complementary disease-specific tools for the 15D generic instrument used in the study. Other disease-specific tools used were Oxford Hip Score (OHS), Oxford Knee Score (OKS) and Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC). The most widely used tool by healthcare providers in assessing OA patients is WOMAC Osteoarthritis Index which consists of 24 items used to evaluate pain, stiffness and physical functions of OA patients in daily living .
Cost-effectiveness of interventions for the management of knee and hip OA
For surgical modalities for knee OA, the most common intervention was total knee arthroplasty whilst the most common surgical modality for hip OA was total hip arthroplasty.
Cost-effectiveness of Total Knee Arthroplasty (TKA)
TKA versus non-surgical/non operative strategies
Four studies compared TKA to non-operative/non-surgical strategies [18, 28, 31, 32] and all studies concluded that TKA is a cost-effective intervention. Of these, three studies adopted a societal perspective [18, 31, 32] whilst the fourth study  adopted a healthcare provider perspective. The aim of the first study  was to assess the cost-effectiveness of TKA in the younger working population and used a Markov model to assess the cost-effectiveness of TKA over a 30 year period in a hypothetical 50 year old patient with severe OA. The second study also used a Markov model to estimate the lifetime cost-effectiveness of TKA in patients with end stage OA of the knee . The remaining two studies [28, 32] assessed the short term cost-effectiveness of TKA using trial-based and cohort studies and did not limit the population included in their respective studies by age or stage of the disease. A summary of results is presented in Table 2.
TKA versus Unicondylar/Unicompartmental Knee Arthroplasty (UKA)
Five studies compared TKA with UKA to determine the most cost-effective option [21, 25, 27, 33, 34]. The first study  looked at cost-effectiveness over 2 years using a prospective observational study and found that TKA was associated with both a higher cost and a QALY gain, but could not be 95% confident that TKA is cost-effective due to the short length of their study. The second study  found that TKA was associated with higher costs and longer hospital stays in the short run whilst UKA was associated with significantly poorer long term survival rates and higher possibility for revision surgery or secondary TKA. The study noted that the cost saved by lower implant prices and shorter hospital stays may not be able to cover the cost of extra revision surgeries that are needed in the future . Peersman et al.  used a Markov model to assess cost-effectiveness in four different age groups (<55, 55-65, 65-75 and 75+) and found that in all age groups UKA was associated with cost reductions and health gains. The conclusion from this study was that TKA was not cost-effective when compared to UKA. However, this study did not adopt a societal perspective. The study by Soohoo et al.  used a decision model to assess cost-effectiveness in patients with end stage unicompartmental knee OA and found UKA to be cost-effective compared to TKA if the durability and function of UKA are assumed to be the same as TKA. The final study  compared TKA with UKA and High Tibial Osteotomy (HTO) in younger patients (50-60 years) with unicompartmental OA using a Markov model and from a societal perspective. The study concluded that TKA had just a 31% chance of being cost-effective compared with UKA and THO and that HTO provided value for money in 50 to 60 year old patients. A summary of results are presented in Table 2.
TKA versus other treatments
One study compared TKA with a do nothing approach over patients lifetime in the Australian population from a health system perspective , and found TKA to be a cost-effective intervention. Another study  compared early and delayed TKA (with and without a non operative bridge) in a cohort of 60 year olds from a societal perspective. The study found that TKA without delay is the preferred cost-effective treatment strategy when compared to waiting for TKA without non-operative bridge. This study noted that as it is unlikely that patients waiting for TKA would not receive non-operative treatment, TKA without delay may be an overall cost-saving health care delivery strategy.
Another study  compared two types of TKA techniques (standard and innovative TKA) and concluded that innovative implants would be cost-effective if they reduce TKA failure by approximately 50%. Finally, Losina et al  used a Markov model to simulate costs and QALY gains for TKA, carried out in low, medium and high volume hospitals; and using no TKA as comparator. Findings relate to the Medicare aged population in the US. TKA was found to be cost-effective across all risk groups and, usurpingly, to be more cost-effective when carried out in high volume hospitals (Table 2).
Cost-effectiveness of Total Hip Arthroplasty (THA)
THA vs Metal on metal hip resurfacing arthroplasty (MoM-HRA)
Metal-on-metal hip resurfacing arthroplasty (MoM-HRA) was considered as an alternative in two studies [29, 37]. The first study used a Markov model to compare the cost-effectiveness of THA and MoM-HRA in patients aged 50 years and over from a health system perspective over a 30 year period and the results show that MoM-HRA is cost-effective in younger patients and although MoM-HRA showed improvements in QALYs, further research is needed to reach a definite conclusion as to which is the most cost-effective intervention . The second study used a Markov model to assess the cost-effectiveness of THA compared with MoM-HRA from a health system perspective over a 15 year period. The study concluded that age wise, MoM-HRA was preferable in younger patients and THA in older patients and gender wise, MoM-HRA was more preferable in men and THA in women .
THA vs other strategies
One study compared THA to a non-operative strategy from a health care perspective and found THA to be a cost-effective intervention . Another study compared the intervention to a do nothing approach over patients’ lifetime in the Australian population from a health system perspective and found THA to be cost-effective . The study by Mota used a Markov modelling approach to compare early and delayed hip arthroplasty in a cohort of patients based on sex and age (50-59 years, 60-74 years and 75 years and over) from a health provider perspective and the results from this study suggest that early THA is a cost-effective option across groups based on age and sex .
Four studies compared various techniques for THA. The first study  compared two techniques for THA (cementless and hybrid) over patients lifetime using a Markov model and found the cementless technique to be cost-effective compared to the hybrid technique in most cases. However, the cementless technique was found to be dominant in patients less than 43 years whilst the hybrid technique seemed to be dominant in patients aged 83 and over.
The second study assessed the lifetime cost-effectiveness of cemented, cementless and hybrid techniques and found the hybrid to be the most cost-effective compared to cemented and cementless in 60, 70 and 80 year old patients. The results obtained in this study were similar for both men and women . The third study  compared five different techniques for THA from an NHS/PSS perspective and concluded that it is difficult to make a choice between techniques based on cost-effectiveness grounds alone. The fourth study assessed the cost-effectiveness of three types of prosthesis for hip replacement (cemented, cementless and hybrid) in adults aged between 55 and 84 years. The study found the hybrid prosthesis to be the most cost-effective across all age groups, with the exception of 80 year old women where the cemented prosthesis was the most cost-effective .
Cost-effectiveness of other surgical interventions
For studies that considered implant systems, one study evaluated the KineSpring implant system and found it to be cost-effective compared to other surgical and conservative treatments . Another study compared arthroscopic surgery with a non-operative treatment and found that arthroscopic surgery was not a cost-effective option . A summary of the results and conclusions of studies assessing the cost-effectiveness of surgical interventions is presented in Table 2.
Overall quality of included studies
Based on the Quality of Health Economic Studies (QHES) instrument, a total of six studies were categorised as good quality with scores of 75 and above whilst fourteen other studies were categorised as moderate quality with scores between 50 to 74 (Table 2 and Additional file 1). Three studies had scores below 50 [21, 22, 28] and a close examination of these studies revealed striking flaws such as not reporting the source of transition probabilities, perspectives, discount rate, cycle length and time horizon. One study  did not perform any sensitivity analysis to deal with the sampling uncertainty or give any details of the source of effectiveness data.
Fourteen out of the eighteen model based studies used Markov/semi-Markov models due to the chronic nature of OA and the ability of such models to handle recurrent events. Other model types that were used include decision tree modelling  and discrete-event simulation (DES) which has the flexibility to accommodate a richer structure without making it unmanageable in size . Only one study did not specify which model type was used as the basis of its economic evaluation . The time horizon used in the model based studies varied from one year to lifetime and most of the studies chose a 1-year cycle length for transitions to occur from one health state to another. For those studies that accounted for revision of surgery and failure of implant as one of the outcomes, one year is considered as a reasonable time to decide for further management, should any of the events occur. The most commonly used sensitivity analysis in the model-based economic evaluations in this review is probabilistic sensitivity analysis. This involves specifying distributions for model parameters to represent uncertainty in their estimation followed by employing Monte Carlo simulation to select values at random from those distributions . Other types of sensitivity analysis used were deterministic, one-way and two-way sensitivity analysis, subgroup analysis, regression analysis and scenario analysis.
This systematic review was conducted with the objective of assessing the cost-effectiveness of surgical interventions for the treatment of knee and hip OA. Overall, the review found that most studies considered the most important components pertinent to economic analyses such as perspective, currency, price year and time horizon. Total knee arthroplasty, total hip arthroplasty and metal-on-metal hip resurfacing arthroplasty showed evidence of cost-effectiveness and improvement in quality of life of the patients. However, this depended on the population that was considered and the interventions that they were compared to. For example, TKA and THA were found to be cost-effective for patients with severe or end-stage knee or hip OA across all age groups and when compared to non-operative strategies. Regardless of perspective adopted, TKA and THA remain among the most effective interventions in terms of improvements in quality of life of OA patients. Compared to early primary THA or TKA, the findings suggest that delayed total hip arthroplasty was not cost-effective . MoM-HRA surgery was more cost-effective in younger patients.
More than half of the studies in this review used decision-analytic models and as expected, some of the earlier studies [25, 43] used decision trees to analyse the cost-effectiveness of the interventions of interest, whilst the more recent studies utilised Markov models. This is an indication that adequate information on model structures is now readily available and guidelines are being adhered to. Based on the chronic nature of the disease and potential of recurrence of the events that may occur during disease progression in OA, Markov models have been shown to be the most suitable decision-analytic model for this condition since they provide a far more convenient way of modelling prognosis for clinical problems with ongoing risk whereby events may re-occur and when the utility of an outcome depends on when it occurs . One study employed a discrete-event simulation (DES) model to assess the cost-effectiveness of total hip and knee arthroplasty in Australia . The literature has shown that DES is able to represent the course of a disease more naturally and is best used in a condition where interaction at individual or patient level is a significant component in modelling [45, 46].
Strengths and limitations of the study
To the best of our knowledge, this is the only systematic review pertaining to the cost-effectiveness of surgical treatment modalities in management of osteoarthritis. In addition, methodological issues related with economic evaluations of surgical interventions in management of OA were also assessed and reported in this study. This study critically assessed the quality of included studies both qualitatively with the Philips and CHEERS checklists as well as quantitatively using the QHES scoring tool.
Because a broader search strategy was initially adopted, a large number of studies were hand searched. This may mean that we have been able to identify a larger number of relevant papers than if the initial search criteria had been limited to surgical interventions for hip and knee OA.
Limitations of the study include the following: Due to the study aims and the need to include as many studies as possible, we did not exclude any studies based on the results of the quality checks. Hence, the robustness of this systematic review may possibly be affected by the poor quality studies included in this report. In addition to this, the quality assessment was carried out by one reviewer. Second, studies that were included in this review were conducted across nine countries which may lead to problems such as generalisability and transferability of the study findings to other settings due to differences in factors such as clinical practice, prices and epidemiology of disease [47, 48]. In addition to this, guidance in many countries does not consider economic data to be transferable to their settings in most cases [49, 50]. As a result, care must be taken when interpreting the results of this study in a particular context.
Policy implications and recommendations
Clinical guidelines by the National Institute for Health and Care Excellence in the UK recommend a holistic approach to osteoarthritis assessment and management . The guidelines advocate for patient education and self-management to enhance understanding of the condition and its management. Unfortunately, the information on economic analyses in the guidelines is confined to pharmacological and conventional treatments. Cost-effectiveness findings related to surgical interventions were merely focused on time to referral for surgery as being highlighted in the guidelines by National Collaborating Centre for Chronic Conditions . It is therefore recommended that guidelines should also include suggestions for the use of surgical interventions as well as other forms of treatments and management techniques. One of the concerns around surgical interventions such as arthroplasty relates to the cost implications surrounding it. It may be argued that avoiding or delaying these surgical procedures may have a positive impact on health budgets through savings. However, it should be noted that delaying such a procedure may have a detrimental effect on the quality of life of patients and may lead to additional costs down the line. Studies included in this review concluded that delaying arthroplasty (both knee and hip) was not a cost-effective option and that the health related quality of life lost as a result of the delay is greater than the savings in costs that may occur from delaying the procedure . It is therefore suggested that future cost-effectiveness studies assess the cost-effectiveness of delaying surgery in various sub-groups of patients and in various settings in order to reach a consensus about when the operation should be conducted and when delaying surgery would yield the optimum results.
Although interventions such as THA have been shown to be cost-effective, there needs to be additional studies comparing the various types of THA surgeries in order to maximise benefits from the available resources. In addition, other interventions such as MoM-HRA have been shown to be cost-effective in younger patients . Therefore health policy makers should take such evidence into consideration when providing guidance. Policy makers and stakeholders should therefore consider TKA and THA as opposed to non-operative/non surgical strategies particularly for patients with severe/advanced stage OA . From this review, it is clear that there is limited evidence with respect to other forms of surgical treatments. It is therefore suggested that additional studies should be conducted in order to determine the cost-effectiveness of other forms of surgical interventions for both knee and hip OA.
This study found that approximately 36% percent of studies limited their analysis to a healthcare perspective. It should however be noted that a large proportion of the economic burden of OA is related to indirect costs and productivity losses . Thus, the societal perspective has the potential to capture all important impacts on the whole society. Recent guidelines suggest that due to the chronic nature of OA, a broader societal perspective is preferred [9, 52]. It should however be recognised that national guidelines such as those in the UK recommend that economic analysis should be undertaken from a health service perspective  and as a result, analysts in countries like the UK might limit their study to the health service perspective. However, it is suggested that all studies should also consider the societal perspective within sensitivity analysis in order to provide a better picture of the true burden associated with OA and also ensure that the results are more generalisable to other settings.
This review assessed the cost-effectiveness of surgical interventions for the management of knee and hip osteoarthritis and the results suggest that TKA and THA are cost-effective interventions particularly when compared to non-operative strategies and also when the operation is not delayed. However, there is the need for more studies assessing the cost-effectiveness of other surgical modalities. In addition, most of the identified studies were considered to have moderate quality. It is therefore recommended that more cost-effectiveness studies with high methodological standards are conducted.
Consolidated health economic evaluating reporting standard
Discrete event simulation
EuroQoL five dimension
Health assessment questionnaire
Health related quality of life
High tibial osteotomy
Health utility index
Incremental cost-effectiveness ratio
Metal on metal hip resurfacing arthroplasty
Quality adjusted life years
Quality of health economics studies
Short form 36
Short form 6D
Total hip arthroplasty
Total knee arthroplasty
Unicondylar knee arthroplasty
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All data has been summarised in the results section and the tables.
All authors contributed extensively to the work presented in this paper. HK, PK and RO developed the research question. HK and RO conducted the searches. HK, PK and RO interpreted the data. All authors contributed to drafting the paper and provided comments throughout. All authors approved the final version of the paper.
The authors declare that they have no competing interest.
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Kamaruzaman, H., Kinghorn, P. & Oppong, R. Cost-effectiveness of surgical interventions for the management of osteoarthritis: a systematic review of the literature. BMC Musculoskelet Disord 18, 183 (2017) doi:10.1186/s12891-017-1540-2