- Systematic review
- Open Access
Effect of drugs on bone mineral density in postmenopausal osteoporosis: a Bayesian network meta-analysis
Journal of Orthopaedic Surgery and Research volume 16, Article number: 533 (2021)
Osteoporosis affects mostly postmenopausal women, leading to deterioration of the microarchitectural bone structure and low bone mass, with an increased fracture risk with associated disability, morbidity and mortality. This Bayesian network meta-analysis compared the effects of current anti-osteoporosis drugs on bone mineral density.
The present systematic review and network meta-analysis follows the PRISMA extension statement to report systematic reviews incorporating network meta-analyses of health care interventions. The literature search was performed in June 2021. All randomised clinical trials that have investigated the effects of two or more drug treatments on BMD for postmenopausal osteoporosis were accessed. The network comparisons were performed through the STATA Software/MP routine for Bayesian hierarchical random-effects model analysis. The inverse variance method with standardised mean difference (SMD) was used for analysis.
Data from 64 RCTs involving 82,732 patients were retrieved. The mean follow-up was 29.7 ± 19.6 months. Denosumab resulted in a higher spine BMD (SMD −0.220; SE 3.379), followed by pamidronate (SMD −5.662; SE 2.635) and zoledronate (SMD −10.701; SE 2.871). Denosumab resulted in a higher hip BMD (SMD −0.256; SE 3.184), followed by alendronate (SMD −17.032; SE 3.191) and ibandronate (SMD −17.250; SE 2.264). Denosumab resulted in a higher femur BMD (SMD 0.097; SE 2.091), followed by alendronate (SMD −16.030; SE 1.702) and ibandronate (SMD −17.000; SE 1.679).
Denosumab results in higher spine BMD in selected women with postmenopausal osteoporosis. Denosumab had the highest influence on hip and femur BMD.
Level of evidence
Level I, Bayesian network meta-analysis of RCTs
Osteoporosis is common in postmenopausal women, with microarchitectural deterioration and low bone mass. Approximately, 19% of men and 30% of women in Europe and in the USA are at risk for osteoporosis, and annually around 9 million osteoporosis associated fractures occur . Osteoporosis-associated fractures result in increased disability, mortality and health-care costs, and therefore the treatment and prevention of osteoporotic fractures carries significant clinical and public health importance .
Current approved pharmacological treatments for postmenopausal osteoporosis can be divided into anti-resorptive and anabolic medications . Briefly, anti-resorptive drugs reduce bone resorption, whilst anabolic drugs increase bone formation. The most commonly prescribed agents are anti-resorptive drugs, which include bisphosphonates (BP) (e.g. alendronate, risedronate, zoledronic acid, ibandronate, etidronate), selective oestrogen receptor modulators (SERM) (e.g. raloxifene) and the RANK-ligand inhibitor (e.g. denosumab).
BP were discovered during the search for pyrophosphonate analogues, attempting to benefit from the inhibitory effects of pyrophosphates on calcification . BP work by inhibiting the enzyme farnesyl pyrophosphonate synthase in osteoclasts, influencing their affinity for bone mineral uptake [5, 6]. During early treatment, SERMs decrease bone remodelling by about 20-30%, and thereby result in a modest transitory increase in bone mineral density (BMD) . However, during prolonged therapy, SERMs lead to a decline in BMD, which may account for the only modest reduction in vertebral fracture risk .
Denosumab is a monoclonal antibody against the receptor activator of nuclear factor-kappa B ligand (RANK-ligand), a regulator of osteoclast development. By blocking the RANK-ligand with denosumab the activity, survival and recruitment of osteoblast are inhibited.
Anabolic osteoporosis drugs, such as teriparatide, are usually reserved for patients with severe and established osteoporosis. Both medications lead to an increase in trabecular thickness and improved trabecular microstructure via the teriparatide (PTHR1) receptor [8, 9]. Finally, romosozunab is a novel sclerostin antibody recently approved for the treatment of osteoporosis. Romosozunab has antifracture and anabolic efficacy, increasing bone formation and decreasing bone resorption [10, 11].
Network analysis may provide clinically relevant evidence in the absence of randomised controlled trials (RCTs) comparing relevant pharmaceutical treatments for osteoporosis. Therefore, we conducted this network meta-analysis comparing the effects of nine osteoporosis drugs and their effects on BMD in patients with postmenopausal osteoporosis.
The present systematic review and network meta-analysis follows the PRISMA extension statement for reporting of systematic reviews incorporating network meta-analyses of health care interventions . The follow algorithm guided the preliminary search:
P (population): postmenopausal osteoporosis
I (intervention): medical treatments
C (comparison): denosumab, raloxifene, teriparatide, alendronate, risedronate, zoledronate, ibandronate, etidronate, strontiumranelate
O (outcomes): BMD
Data source and extraction
The literature search was performed by two independent authors (FM; GC). In June 2021, the databases search started. The search on PubMed was performed with the following string: osteoporosis [All Fields] AND (bone [All Fields] OR endocrinology [All Fields]) AND (postmenopausal [All Fields] OR treatment [All Fields] OR management [All Fields] OR spine [All Fields] OR femur [All Fields] AND hip [All Fields] OR BMD [All Fields]) AND (mineral density [All Fields] OR Bisphosphonates [All Fields] OR Denosumab [All Fields] OR Raloxifene [All Fields] OR Teriparatide [All Fields] OR Alendronate [All Fields] OR Risedronate [All Fields] OR Zoledronate [All Fields] OR Ibandronate [All Fields] OR Etidronate [All Fields] OR Calcium [All Fields] OR Vitamin D [All Fields] OR PTH [All Fields] OR osteoblast [All Fields] OR osteoclast [All Fields]) AND management [All Fields] OR therapy [All Fields]. The same search strings were used to search Google Scholar, Embase and Scopus. The resulting titles and subsequent abstracts were screened by the same two authors. If they matched the topic, the article full-text was accessed. A cross reference of the bibliographies was also performed. Disagreement was debated and solved by a third senior author (NM).
All the randomised clinical trials (RCTs) investigating the effects of two or more drug treatments on BMD for postmenopausal osteoporosis were accessed. Given the authors language capabilities, articles in English, German, Italian, French and Spanish were eligible. Only levels I and II RCTs according to the Oxford Centre of Evidence-Based Medicine  were considered. Only articles reporting quantitative data under the outcomes of interest and articles with a minimum 12 months follow-up were considered. Studies treating patients with calcium and vitamin D without any other drugs were not included. Studies reporting data on patients with iatrogenic-induced menopause were not included, as well as those treating paediatric and/or adolescent patients. Studies on patients undergoing immunosuppressive therapies or organ transplantation were also not considered. Studies reporting data on patients with malignancies or pathological bone diseases other than osteoporosis were not included. Studies reporting data on mixed treatments or taking advantage from adjuvants were excluded. Editorials, registries, comments, expert opinions and reviews were not eligible. Animals or in vitro studies were also not eligible. Missing data under the outcomes of interest warranted the exclusion from this study.
Outcomes of interest
Two authors (FM; GC) performed data extraction. Study generalities (author, year, journal, duration of the follow-up) and patient baseline demographic information were collected: number of samples and related mean age, percentage of female, mean bone mass index (BMI) and mean BMD (overall, spine, hip, femur neck). The following drugs were considered in the analyses: denosumab, raloxifene, teriparatide, alendronate, risedronate, zoledronate, ibandronate and etidronate. The outcome of interest was BMD at last follow-up.
Methodology quality assessment
The methodological quality assessment was performed by two authors (FM; GC). The risk of bias summary tool of the Review Manager Software (The Nordic Cochrane Collaboration, Copenhagen) was used for evaluation. The following risk of bias was assessed: selection, detection, attrition and other source of bias.
The statistical analyses were performed by the main author (FM). Baseline comparability was assessed through the IBM SPSS software. The analysis of variance (ANOVA) was used for analysis, with P values > 0.1 was considered satisfactory. The STATA Software/MP, Version 14.1 (StataCorporation, College Station, Texas, USA) was used for the statistical analyses. The NMA was performed through the STATA routine for Bayesian hierarchical random-effects model analysis. The placebo treatment was used as reference group. The inverse variance method was used for analysis, with standardised mean difference (STD) and standard error (SE) effect measures. The overall inconsistency was evaluated through the equation for global linearity via the Wald test, with P values< 0.05 indicating statistically significant inconsistency. Otherwise, if P > 0.05 the null hypothesis cannot be rejected, and the consistency assumption could be accepted at the overall level of each treatment. Both confidence (CI) and percentile (PrI) intervals were set at 95%. Edge plot, interval plots and funnel plots were obtained and evaluated.
The primary literature search resulted in 1354 articles. Of them, 477 were RCTs. A further 101 were removed because duplicated. Additional 270 articles were excluded because of the study design (N = 26), non-clinical studies (N = 34), glucocorticoid-induced osteoporosis (N = 51), treatment of bone malignancies (N = 56), language limitations (N = 12) and others (N = 91). A further 42 articles were excluded because it did not report quantitative data under the outcomes of interests. Finally, 64 RCTs were included for analysis. The literature search results are shown in Fig. 1.
Methodological quality assessment
The risk of bias summary evidenced some point of strength of the present study. First, the randomised design of all the included studies leads to low risk of selection bias. Moreover, most studies performed assessors, patients and personnel blinding, thus leading to a low risk of performance and detection bias. The risk of attrition and reporting bias were both low. The risk to incur in unknown/other bias was low to moderate. Concluding, the risk of bias was low, attesting to the methodological assessment of the present study is a very good quality. The score of each risk of bias item for each included study is shown in Fig. 2.
Data from 82,732 patients were retrieved. The mean follow-up was 29.7 ± 19.6 months. The mean age of the patients was 67.3 ± 6.1 years. The mean BMI was 25.0 ±1.7 kg/m2. The mean BMD at baseline of the spine was 0.83 ± 0.11, of the hip was 0.74 ± 0.07 and of the femoral neck was 0.63 ± 0.07 g/cm2. The ANOVA test found baseline comparability (P > 0.1) with regards to age, BMI and BMD. Studies’ generalities and patients’ demographics are shown in Table 1.
Outcomes of interest
Denosumab resulted in a higher spine BMD (SMD −0.22; SE 3.38; 95% CI −6.84 to 6.40), followed by pamidronate (SMD −5.66; SE 2.64; 95% CI −10.83 to −0.50) and zoledronate (SMD −10.70; SE 2.87; 95% CI −16.33 to −5.07). Denosumab resulted in a higher hip BMD (SMD −0.26; SE 3.18; 95% CI −6.50 to 5.98), followed by alendronate (SMD −17.03; SE 3.19; 95% CI −23.29 to −10.78) and ibandronate (SMD −17.25; SE 2.26; 95% CI −21.69 to −12.81). Denosumab resulted in a higher femur BMD (SMD 0.10; SE 2.09; 95% CI −4.00 to 4.20), followed by alendronate (SMD −16.03; SE 1.70; 95% CI −19.37 to −12.69) and ibandronate (SMD −17.00; SE 1.68; 95% CI −20.29 to −13.71). The equation for global linearity found no statistically significant inconsistency (P > 0.05) in all comparisons. Edge, funnel and interval plots of these comparisons are shown in Fig. 3.
Over the last decades, effective pharmaceutical treatments have been developed for the management of osteoporosis. However, most studies have not included multiple active comparators because of cost constraints, ethical problems and government regulations. This network meta-analysis is the first to include 64 RCTs with a total of 82,732 patients, including only studies with levels of evidence 1 and 2. This study compared and evaluated the influence of currently available pharmacological treatments for osteoporosis with one another in terms of BMD. The present investigation shows that denosumab was associated with the highest BMD of all evaluated osteoporosis drugs in selected women with postmenopausal osteoporosis.
Meta-analyses are considered valuable tools to analyse different studies. However, they only allow a pair-wise assessment of treatments. In contrast, network meta-analyses allow to blend together information over a network of comparisons to compare the relative effects of different treatments used for the same condition. Network meta-analysis provides vital clinical information by ranking the relative efficacy of all interventions, even those which have not been compared with one another directly.
Most previous network meta-analyses have investigated the effects of osteoporosis treatments on fracture risk, which is in contrast to our analysis which instead focused on the influence of drugs on BMD. A recent network meta-analysis of 22 RCTs studied the relative efficacy of 10 osteoporosis drugs in postmenopausal women at high risk of fragility fractures . Abaloparatide had the highest probability of preventing vertebral, non-vertebral, and wrist fractures compared to placebo and all other treatment options. This was also confirmed by another network meta-analysis of 67,524 patients: both abaloparatide and teriparatide significantly reduced the fracture risk compared to placebo and other osteoporosis medications . In addition, a further network meta-analysis confirmed that teriparatide seemed to be most effective in preventing new non-vertebral fractures in patients with osteoporosis . A systematic review and network meta-analysis of RCTs evidenced that non-bisphosphonate interventions (including denosumab, raloxifene, teriparatide, romosozunab) are clinically effective in reducing vertebral fractures compared to placebo, and that they are beneficial for change in femoral neck BMD . Romosozunab, followed by alendronate, resulted in the greatest effect on femoral BMD.
Previous studies suggest that anabolic osteoporosis treatments, such as abaloparatide and teriparatide, exert the highest influence on reducing the overall fracture risk. The present study shows that denosumab has the greatest effect on BMD, independent of the fracture risk. Denosumab demonstrates a high affinity and specificity to the RANKL, and therefore prevents it from binding to the RANKL receptors on osteoclasts and their precursors, with a direct effect on the activity and life span of existing osteoblasts . Denosumab increases BMD by inhibiting bone resorption and remodelling . The FREEDOM trial confirmed that denosumab, administrated every 6 months, significantly reduces the hip fracture risk by 40%, the non-vertebral fracture risk by 20% and the vertebral fracture risk by 68% .
The extension of the FREEDOM study showed that treatment with denosumab up to 10 years results in a cumulative gain in BMD of 21.7% at the lumbar spine, and 9.2% at the total hip, compared to baseline . Denosumab resulted in lower rates of new vertebral and non-vertebral fractures throughout the study period . Denosumab is administrated subcutaneously every 6 months, and therefore it is likely that the adherence to the medication is better compared to BP. This was confirmed by Kendler et al., who showed greater satisfaction when patients transitioned to denosumab as compared to a monthly oral BP . Palacios et al. also confirmed a higher adherence of patients to denosumab compared to BP, and that most patients do prefer denosumab over BP for the treatment of osteoporosis . The advantages of denosumab over BP seem the more favourable side-effect profile (low rates of infections and malignancies), and, as shown in the present study, the more pronounced beneficial effects on BMD. This was also confirmed previously, with denosumab more effective than ibandronate and alendronate [24,25,26,27,28].
Limitations of this network meta-analysis include the focus on the effects of osteoporosis treatments on spinal and hip BMD without an assessment of fracture risk reduction, adverse events or costs. The investigation of adverse effects seems to be particularly important, since adverse effects can affect adherence to treatment. Also, we only included studies which evaluated the effects of anti-osteoporosis medications for postmenopausal osteoporosis, but not for age-related, senile, or secondary osteoporosis. Further studies are necessary to examine these aspects. The minimum follow-up for a study to be included in the present network meta-analysis was 1 year. However, osteoporosis requires long-term treatment to produce clinically relevant benefits. This is especially important when certain medications, such as denosumab, have to be discontinued, and thereby lead to a potential increase in fracture risk. Another potential limitation is related to the limited variety of drugs included for analysis. Given the lack of studies in the literature, some commonly used medications, such as abaloparatide and romosozumab, were not included in the analyses. In light of these limitations, data from the present Bayesian network meta-analysis must be interpreted with caution.
Strengths of our study are the comprehensive literature search of multiple databases in multiple languages, which led to the inclusion of 64 evidence levels I and II RCTs with a total of 82,732 interventions. We also performed a rigorous review process, which was performed by two independent reviewers. Finally, we summarised and analysed the latest evidence of anti-osteoporosis medications on BMD in postmenopausal women from RCTs with the highest levels of evidence, which to our knowledge has not been performed before.
The present network meta-analysis shows that denosumab followed by pamidronate and zoledronate is associated with higher spine BMD in selected women with postmenopausal osteoporosis. Denosumab followed by alendronate and ibandronate had the highest influence on hip and femoral BMD. Future studies should evaluate the effects of anti-osteoporosis drugs on the overall fracture risk and on other types of osteoporosis.
Availability of data and materials
This study does not contain any third material.
Bone mineral density
Receptor activator of nuclear factor-kappa B ligand
Selective oestrogen receptor modulators
Randomised controlled trials
Standardised mean difference
Analysis of variance
Standardised mean difference
Body mass index
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Migliorini, F., Maffulli, N., Colarossi, G. et al. Effect of drugs on bone mineral density in postmenopausal osteoporosis: a Bayesian network meta-analysis. J Orthop Surg Res 16, 533 (2021). https://doi.org/10.1186/s13018-021-02678-x
- Bone mineral density