SYSTEMATIC REVIEW

 

Pharmacological Management of Bone Loss in Patients with Spondylodiscitis: A Systematic Review

 

Pedro L. Bazán,* Ricardo Cepeda Jordan,** Gilmar Hernández Molina,# José L. Mansur##

*Spinal Pathology Unit, Orthopedics and Traumatology Service, Hospital Interzonal General de Agudos “General San Martín”, La Plata, Buenos Aires, Argentina.

**Orthopedics and Traumatology Service, Hospital Regional de Vélez, Santander, Colombia.

#Orthopedics and Traumatology Service, Hospital Militar Bogotá, Colombia ##Centro de Endocrinologia y Osteoporosis, La Plata, Buenos Aires, Argentina

 

ABSTRACT

Introduction: Lytic bone defects are a common and devastating consequence of spondylodiscitis, often leading to vertebral collapse and spinal instability. Currently, there are no established guidelines for pharmacological management of this condition in conjunction with antibiotic therapy. Objective: To review the existing scientific evidence on the pharmacological treatment of bone loss secondary to spondylodiscitis. Materials and Methods: A systematic search was conducted in major medical databases to identify studies evaluating the use of teriparatide, romosozumab, or denosumab in patients with lytic bone defects associated with pyogenic spondylodiscitis or Pott’s disease. Results: Two studies reported improved bone mineral density and enhanced osteoblastic activity following the use of teriparatide in patients with bone loss or osteoporosis associated with vertebral infection. Adverse reactions were minimal, and no interactions with antibiotic therapy were observed. In one of the studies, treatment was supplemented with romosozumab. A third study demonstrated improved outcomes in infected osteoblasts. Conversely, the use of bisphosphonates and denosumab was associated with poor outcomes and worsening of the infection. Conclusions: Anabolic agents such as teriparatide and romosozumab appear to be promising options for managing bone loss and severe osteoporosis in the context of vertebral infections, with a favorable safety profile. However, clinical trials are needed to confirm their efficacy.

Keywords: Discitis; spondylodiscitis; bone loss; tuberculosis; teriparatide; bisphosphonates; denosumab.

Level of Evidence: III

 

Manejo farmacológico de la pérdida ósea en pacientes con espondilodiscitis. Revisión sistemática

 

RESUMEN

Introducción: El defecto óseo lítico es una consecuencia devastadora y muy frecuente del paciente con espondilodiscitis, y es responsable del colapso y la inestabilidad. En la actualidad, no existe una pauta para el manejo farmacológico. Objetivo: Revisar la evidencia científica publicada sobre el tratamiento farmacológico de la perdida ósea secundaria a espondilodiscitis. Materiales y Métodos: Se realizó una búsqueda sistemática en bases de datos de referencia médica para hallar estudios sobre el uso de teriparatida, romosozumab o denosumab en pacientes con defecto lítico asociado a espondilodiscitis piógena, tuberculosis vertebral. Resultados: En dos artículos, se comunicó la mejoría de la densidad mineral y la formación osteoblástica con el uso de teriparatida en pacientes con defecto óseo u osteoporosis asociada a infección vertebral; las reacciones adversas fueron escasas, no hubo interacción con los antibióticos, y uno de ellos cuando se complementó con romosozumab. Un tercer artículo informó mejoría en los osteoblastos infectados. Asimismo, los bifosfonatos y el denosumab provocaron malos resultados y empeoraron la infección. Conclusiones: El uso de fármacos anabólicos, como teriparatida y romosozumab, promete ser una excelente opción para el tratamiento de la pérdida ósea y la osteoporosis severa en casos de infección vertebral, con escasas reacciones adversas. Se requieren estudios clínicos para verificarlo.

Palabras clave: Discitis; espondilodiscitis; pérdida ósea; tuberculosis; teriparatida; bifosfonatos; denosumab.

Nivel de Evidencia: III

 

INTRODUCTION

Spondylodiscitis is an infection affecting the intervertebral disc and adjacent vertebrae, which can result in significant bone loss and, secondarily, spinal instability.1 Its incidence, although low (0.2–2.4/100,000 inhabitants in Western countries), has increased over the last 20 years due to prolonged life expectancy and a rise in comorbidities, leading to devastating consequences for patients, the healthcare system, and even mortality.2

Infectious involvement is associated with advanced osteolysis, vertebral destruction, instability, pain, severe disability, and, in some cases, serious neurological disorders.3-5

To date, various treatments have been implemented for spondylodiscitis, including bed rest, antibiotic therapy, and surgical intervention in cases of spinal instability or neurological compromise. However, no pharmacological treatment currently exists for vertebral destruction and bone defects.6 Moreover, a significant number of patients with spinal infection also present with untreated subclinical osteoporosis—an association that has not yet been thoroughly studied.2 Although the gold standard for diagnosing osteoporosis is bone mineral density measurement via DXA scanning, it is now possible to assess bone quality by quantifying Hounsfield units (HU) through computed tomography.7-10

Teriparatide, a parathyroid hormone analogue (PTH 1–34), is an anabolic agent that stimulates osteoblastic proliferation and currently plays a key role not only in the treatment of osteoporosis, but also in the prevention of complications and planning of spinal surgeries.11-20 For this reason, it appears to be a promising agent in the management of bone defects associated with spinal infections.

The aim of this study was to review the current scientific evidence on the use of anabolic drugs and monoclonal antibodies in patients with spondylodiscitis, in order to determine whether they should be recommended for those presenting with bone loss or osteoporosis associated with the infection.

 

MATERIALS AND METHODS

This study was conducted in accordance with the PRISMA 2020 (Preferred Reporting Items for Systematic Reviews and Meta-Analyses) guidelines.

 

Sources and Data Search

A systematic literature search in English was performed from January 2009 to March 2023 in the PubMed, Cochrane, LILACS, and SciELO databases using the MeSH terms: (((teriparatide) OR (romosozumab)) AND (((spine) OR (infection)) OR (spondylodiscitis))) AND ((bone defect) OR (bone loss))).

Filters were applied by year, text availability, article characteristics, article type, and publication date.

 

Inclusion Criteria

Analytical studies, randomized clinical trials, systematic reviews, narrative reviews, and case reports were included. The inclusion criteria comprised studies evaluating the use of teriparatide, romosozumab, or denosumab for treating bone defects associated with spinal infections in both human and animal models, as well as studies analyzing the relationship between osteoporosis and spondylodiscitis.

 

Exclusion criteria

Articles addressing osteoporosis or bone defects not associated with spondylodiscitis or involving vertebral tuberculosis were excluded. Also excluded were studies involving patients with osteoporosis secondary to other causes, such as chronic kidney disease, rheumatoid arthritis, and other metabolic, endocrine, or immunological conditions. Duplicates, unpublished studies, books, letters, and other documents were also discarded.

 

RESULTS

The initial search yielded 396 articles between 2009 and 2023 in PubMed, and 0 in Cochrane, SciELO, and LILACS. Continuing the selection process in PubMed, 375 articles were available in full text and written in English. Books, conference papers, abstracts, duplicate articles, unpublished studies, editorials, technical reports, and citations were excluded. This left a total of 207 studies. A second screening was conducted by reviewing the titles and abstracts. 199 studies were excluded for not being relevant to the research topic, as they included patients with osteoporosis secondary to endocrine, autoimmune, renal, or metabolic diseases, or patients receiving anabolic or antiresorptive drugs outside the context of vertebral infection.

Eight articles were identified that related osteomyelitis or spondylodiscitis to osteoporosis or bone loss. Of these, one was excluded because it did not address spondylodiscitis; another because it linked denosumab to infection risk in patients with low bone mineral density, but not with spondylodiscitis; a third because it was a review article on surgical site infection; and another because it focused solely on osteonecrosis management due to antiresorptive drugs and proinflammatory cytokines. Ultimately, four articles were selected for analysis: Two that associated anabolic agents with bone defects in patients with spondylodiscitis, one that evaluated the response of teriparatide to isoniazid and rifampicin, and one on the diagnosis of osteoporosis in patients with spondylodiscitis (Table).

 

 

 

 

 

 

 

 

Data Analysis

The review demonstrated that the available literature on this topic is limited. No randomized clinical trials or high-level evidence studies were identified.

The earliest study dates to 2014, in which Shinohara et al. administered 56.5 µg/week of teriparatide to a 78-year-old diabetic patient with spondylodiscitis and secondary bone destruction at T11. Bone mineral density (BMD) was assessed via DXA scan at 3, 6, and 12 weeks, showing a 17.6% increase in BMD as early as the third week, along with better resolution of the infection at 8 weeks. Reported adverse effects included nausea and headache. The authors recommended teriparatide administration in these patients.6

In 2020, Bettag et al. retrospectively analyzed 200 patients with spondylodiscitis treated surgically via posterior instrumentation and followed up for one year. Only 5% had a prior osteoporosis diagnosis and received pharmacological treatment. When bone density was assessed using Hounsfield units (HU) via computed tomography, 41% (81 patients) were found to have undiagnosed osteoporosis. Patients with HU <110 had a significantly higher rate of revision surgery and implant loosening. The authors recommended HU quantification in patients with spondylodiscitis and associated osteoporosis, and early initiation of anabolic treatment, such as teriparatide, due to the high risk of complications including fractures and implant loosening.2

In 2021, Ohnishi et al. administered teriparatide to a patient with spondylodiscitis, severe osteolysis, and an L3 fracture. Anabolic treatment was initiated but discontinued due to a rash. The patient subsequently underwent fixation from T12 to L5. A surgical site infection occurred 6 weeks after discontinuing teriparatide, accompanied by worsening osteolysis. Romosozumab was then initiated, resulting in a favorable response with bone bridging at 6 weeks and complete resolution of the infection.1

Finally, Lee et al. (2022) observed a 705% increase in alkaline phosphatase levels and osteoblastic activity at day 28 (p < 0.0031) after administering teriparatide at 400 ng/mL every 48 hours for 7 days, alongside isoniazid and rifampicin, against MG-63 cells infected with spinal tuberculosis. Infection was eradicated by day 7. There were no adverse reactions and no reduction in antibiotic efficacy.21

 

DISCUSSION

The bone defects and low mineral density associated with spinal infections pose a significant challenge for spinal surgeons due to irreparable structural loss, functional impairment, pain, and the frequent need for additional surgical interventions—all of which have a considerable economic impact.1 The infectious process often leads to rapid and severe bone lysis and accelerated destruction.22

Molecular studies have shown that infection suppresses osteoblastogenesis and increases osteoclastic activity through the release of proinflammatory cytokines—such as tumor necrosis factor-alpha, interleukin-1β, and interleukin-6—by macrophages and lymphocytes. These cytokines bind to the receptor activator of nuclear factor kappa-B ligand (RANKL), which activates osteoclastogenesis via its receptor RANK.23-28 Moreover, bone loss is further exacerbated by prolonged bed rest and lack of physical activity.29

Currently, there is no established consensus regarding the use of osteoanabolic drugs in the context of infection.1 These agents have been used for managing osteoporosis in patients with osteomyelitis—not only in the spine, but also in other locations such as the femur and tibia—with the aim of preventing osteoclastic resorption and thereby minimizing structural damage.30 Two major categories of bone-active drugs have been studied in the laboratory: anabolic agents (mainly teriparatide and romosozumab) and antiresorptives (bisphosphonates and denosumab).

Teriparatide, an analog of parathyroid hormone, exhibits anabolic effects by inhibiting osteoclast activity while simultaneously promoting bone formation—an advantage over antiresorptive agents, which inhibit resorption but also suppress osteogenesis and bone turnover.1

There is increasing evidence linking osteonecrosis of the jaw to infection as an early histological manifestation.31,32 Various infections have been reported in association with antiresorptive therapy. Interestingly, teriparatide has emerged as the treatment of choice in such cases, owing to its bone-forming properties.33,34 However, data on its use in patients with bone defects secondary to infection remain scarce, only a few case reports. However, there have been reports of its successful application in infected hip arthroplasty, septic arthritis of the elbow, and infected tibial nonunion—all without exacerbation of the infectious process.35-37

Romosozumab, a monoclonal antibody, inhibits sclerostin binding to low-density lipoprotein receptors (LRP-5 and LRP-6), leading to increased β-catenin levels in the osteoclast. This results in suppressed bone resorption and enhanced osteogenesis.38

Among antiresorptives, denosumab is a monoclonal antibody that inhibits the precursor of osteoclasts in mature cells by blocking RANKL. Although effective in managing osteoporosis,39 several clinical trials have reported an increased incidence of infections such as cellulitis, erysipelas, surgical site infections, and urinary or gastrointestinal infections.40,41 In a metaanalysis of 20,470 patients across 24 controlled trials, Catton et al. observed a statistically significant increase in the overall infection rate in patients treated with denosumab (relative risk: 1.11; 95% CI: 1.02–1.20; p = 0.02).42 These findings suggest that denosumab may not be an ideal option for patients with spondylodiscitis, as it could potentially aggravate the infectious process. Further research is necessary to clarify this association.

Bisphosphonates, which are pyrophosphate analogs that bind to hydroxyapatite on the bone surface, are categorized into nitrogen-containing and non-nitrogen-containing types. The former are associated with osteoclast apoptosis and are more commonly used in the treatment of bone loss.43 However, the nitrogen-containing molecule has also been found to enhance bacterial adhesion to the bone surface, potentially worsening infection. Additionally, they have been linked to inflammatory complications, including the development of osteomyelitis. As a result, bisphosphonates are not recommended in cases of vertebral osteomyelitis, as their potential to worsen infection outweighs their benefits in reducing bone resorption.44,45

The first line of management for spondylodiscitis is conservative treatment with antibiotics and analgesics. From the outset, the infection presents a lytic component that progresses to bone defects, vertebral destruction, and instability, with neurological repercussions in some patients.1,6,21 In these cases, surgery offers the best alternative for management; however, it is often doomed to failure due to the progression of osteolysis and implant failure in patients who do not receive osteoforming therapy. This results in surgical reinterventions that pose life-threatening risks and are not favorable for the healthcare system.

For this reason, it is also recommended to quantify Hounsfield Units (HU) by computed tomography during spinal planning in order to reduce complications.2

Regarding adverse reactions, Shinohara et al. and Onishi et al., in their case series, recorded mild events such as rash, headache, nausea, and vomiting caused by anabolic agents. These were easily managed and did not interfere with antibiotic therapy, resolution of the infection, or the patients’ overall health status. On the contrary, they observed signs of early bone formation around the third week.1,6

In addition to pyogenic spondylodiscitis, Lee et al. confirmed the osteoforming effect of teriparatide in a case of tuberculous spondylodiscitis with vertebral destruction, reporting no adverse reactions or drug-drug interactions.21 One of the most commonly used antibiotics in the treatment of spinal infections is vancomycin, which has demonstrated cytotoxic effects on osteoblasts.46

Tsuji et al. highlighted the protective effect of teriparatide after administering 7.5 µg over 24 hours to cultured bovine serum cells infected with spinal pathogens, successfully reducing vancomycin-induced cytotoxicity.47

The optimal dosage and administration interval of these anabolic agents have not yet been established. However, it is clear that treatment was initiated during the acute phase of infection, with signs of accelerated osteoformation observed within the first three weeks. This effect increased at six weeks and at three months in the reported cases,1,6,21 and with a dose of 56 µg weekly in the study by Shinohara et al.6

Limitations of this study include the absence of controlled clinical trials to determine appropriate dosing and administration intervals for teriparatide and romosozumab; small patient sample sizes; insufficient evaluation of the cost-effectiveness of these agents; lack of standardized HU measurement by computed tomography in clinical practice; and the absence of a multidisciplinary approach integrating infectious disease and endocrinology specialists.

 

CONCLUSIONS

According to the limited available literature, teriparatide and romosozumab appear to be promising options in the management of bone defects and severe osteoporosis in patients with spondylodiscitis. They are associated with few adverse reactions and no drug-drug interactions. The use of antiresorptive agents is not recommended due to the potential risk of infection exacerbation.

Further clinical studies and stronger evidence are needed before these therapies can be routinely recommended in clinical practice.

 

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R. Cepeda Jordan ORCID ID: https://orcid.org/0000-0002-4007-2610

J.  L. Mansur ORCID ID: https://orcid.org/0000-0002-8383-9543

G. Hernandez Molina ORCID ID: https://orcid.org/0009-0008-0078-7890

 

Received on July 31st, 2024. Accepted after evaluation on October 9th, 2024 Dr. Pedro L. Bazán pedroluisbazan@gmail.com https://orcid.org/0000-0003-0060-6558

 

How to cite this article: Bazán PL, Cepeda Jordan R, Hernández Molina G, Mansur JL. Pharmacological Management of Bone Loss in Patients with Spondylodiscitis: A Systematic Review. Rev Asoc Argent Ortop Traumatol 2025;90(3):277-284. https://doi.org/10.15417/issn.1852-7434.2025.90.3.2064

 

 

Article Info

Identification: https://doi.org/10.15417/issn.1852-7434.2025.90.3.2064

Published: June, 2025

Conflict of interests: The authors declare no conflicts of interest.

Copyright: © 2025, Revista de la Asociación Argentina de Ortopedia y Traumatología.

License: This article is under Attribution-NonCommertial-ShareAlike 4.0 International Creative Commons License (CC-BY-NC-SA 4.0).