Abstract
Refracture of cemented vertebrae occurs commonly after vertebroplasty (VP) for osteoporotic vertebral compression fracture (OVCF). It can result in severe pain or neurological deficit, but no preventive medication is available. Owing to the bone anabolic benefits of teriparatide (TP), this study was aimed to compare the outcomes of cemented vertebrae with TP to those without TP. Patients who received VP for OVCF with at least 1 year follow-up were included. The anterior body height (ABH) and middle body height (MBH) and kyphotic angle (KA) were measured before VP and 1 week and at least 1 year after VP. Refracture was defined as a 15% decrease in ABH or MBH and 8° decrease in KA compared with those at postoperative 1 week. The clinical outcomes were evaluated. 35 VP procedures in 21 patients treated with TP (TP group), and, matched to that, 29 out of 133 patients treated with VP alone (VP group) were included. One year after VP, ABH and MBH were significantly greater, except KA, in the TP group (VP group vs. TP group: KA − 4.97° ± 12.1 vs. −2.85° ± 12.21°, p = 0.462, ABH 1.56 ± 0.48 cm vs. 1.84 ± 0.56 cm, p = 0.027, MBH 1.49 ± 0.39 cm vs. 1.73 ± 0.41 cm, p = 0.017). The refracture rates of KA, ABH, and MBH were significantly lower in the TP group (VP group vs. TP group: KA 42.11% vs.8.57%, p < 0.001; ABH 76.32% vs. 28.57%, p < 0.0001; MBH 76.32% vs. 28.57%, p < 0.0001). In single-level subgroup comparison, TP was associated with better improvement of pain VAS and better radiological outcomes. TP was associated with higher BHs and fewer refractures than VP alone, with comparable clinical outcomes 1 year after VP. TP may be associated with better improvement of pain VAS in those with single-level VP procedure. Higher BH was due to the better maintenance effect of TP.
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Discover the latest articles, news and stories from top researchers in related subjects.Introduction
Refracture of cemented vertebrae after vertebroplasty (VP) occurs frequently in patients with osteoporotic vertebral compression fracture (OVCF). Different studies have reported different incidences of refracture1,2,3,4,5,6. Refracture incidence ranged from 0.56% to 76% depending on the definition and follow-up period. Some refractures resulted in severe pain, instability, and even neurological deficits requiring further interventions2,7,8,9. Kyphoplasty (KP) with an intravertebral reduction device (IRD) has been reported as a solution to prevent refracture with stronger anterior mechanical support6. However, after VP, no medical solution exists so far.
Teriparatide (TP) is the recombinant human parathyroid hormone (1–34) that increases bone mass10,11 and decreases the risk of new vertebral fracture in patients with osteoporosis12,13. Its antiosteoporosis effects depend on the enhancement of osteoblast formation14 and prevention of osteoblast apoptosis15. Owing to the anabolic effect, TP had been used to promote the process of bone healing after fracture11,16,17,18,19,20,21,22,23,24,25,26,27,28. For fractures without internal implant fixation, TP was beneficial for nonweight-bearing regions22,28 but not for weight-bearing regions25. The role of TP is very controversial for fractures in weight-bearing regions. TP did not demonstrate benefits for enhancing bone-implant interface strength17 and the fusion rates20,23, although it was associated with better clinical outcomes16,20,23. For OVCF without VP, TP was associated with higher body heights (BHs)29 and pain reduction26,30. However, the local bone environment inside the fractured vertebrae was more complicated by cement after VP31. Hence, an interesting question arises: can TP help maintain the BH and prevent refracture under such a complicated bone environment in OCVF after VP?
This study assessed whether TP can reduce refracture risk in OVCF patients after VP by comparing the radiological and clinical outcomes of cemented vertebrae with TP with those without TP.
Material and methods
Patient selection
This retrospective case-matched study was approved by the Taipei Medical University Joint Institutional Review Board (TNU-JIRB N201705068) and informed consent was waived. All methods were performed in accordance with the relevant guidelines and regulations. For 546 patients, there were 660 operative records about VP-treated thoracic and lumbar OVCFs from January 2013 to December 2016 in Taipei Medical University Hospital. We included patients who underwent VP with or without TP before October 31, 2016 and had at least 1 year of follow-up. Patients who were treated with KP; were followed up for less than 1 year; had other surgical interventions; exhibited neurological deficits; were diagnosed with neoplastic spinal cord compression; had unmanageable bleeding disorders; had systemic or local spinal infections; had severe comorbidities of the heart, liver, kidney, or lung with intolerance to surgery; or had no available preoperative magnetic resonance imaging (MRI) scans were excluded. After reviewing the aforementioned criteria, we included 239 levels of OVCF in 166 patients who received VP. There were 167 OVCFs in 133 patients without TP and 35 OVCFs in 21 patients with TP (TP group). TP was started during the duration 1 month before VP to 6 weeks after VP and used continually for at least 3 months. TP was subcutaneously administrated daily based on the recommended protocol (20 microgram daily)12,13. According to the guideline suggested by the Taiwan National Health Insurance, teriparatide is indicated when patients have all of the followings:
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1.
Bone marrow density (BMD) < −3.0
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2.
More than one vertebral or hip fractures
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3.
Not tolerable to other antiosteoporotic therapy
In addition, TP was also suggested for the patients if they have one of the following indications: 1. Glucocorticoid-induced osteoporosis patients with fragile fracture, 2. More than 2 vertebral fractures simultaneously, 3. Patients with subacute sequential vertebral fracture following the first vertebral fracture (less than 3 months). OVCF was detected through MRI, with bone edema in the fractured vertebra on T2-weighted short tau inversion recovery sequences or vertebral body enhancement on MRI-contrasted T1-weighted sequences. We further matched VP patients to TP patients by age, BMD, gender, preoperative and postoperative 1 week radiological parameters (the kyphotic angle (KA), anterior body height (ABH), and middle body height (MBH)). Consequently, there were 38 levels of OVCF in 29 patients without TP (VP group) and 35 levels of OVCF in 21 patients with TP. Among them, 7 out of 29 patients in VP group and 8 out of 21 in TP group had multilevel VP procedures. Then we did the subgroup analysis of single-level and multilevel VP procedures respectively (Fig. 1).
Radiological outcomes
The radiological parameters were measured on the lateral lumbar spine flexion and extension X-ray obtained when the patients were lying. The average of measurement of flexion and extension X-ray was included into the subsequent analysis. Two experience neurosurgeons independently did the radiological measurement and they were blinded to the clinical information of the patients. The intraclass correlation coefficient was conducted to test the inter-rater reliability. The intraclass correlation coefficient showed that the reliability between these 2 raters were good to excellent in total 267 radiological measurements for KA, ABH, and MBH (KA: 0.989, ABH: 0.90; MBH: 0.888, respectively) (Supplement Table 2).
The KA, ABH, and MBH were measured before VP (preop), 1 week after VP (postop-1w), and 1 year after VP (postop-1y). Radiological parameters of the cemented vertebrae usually did not change 6 months after VP6. KA was measured from the inferior end plate of the vertebral body, which was above one level of the injured vertebral body, to the superior end plate of the vertebral body, which was below one level of the injured vertebral body (Fig. 2). ABH and MBH were defined as the distance between the upper and lower edges at the anterior and middle, respectively, of the vertebral body (Fig. 2).
To investigate the maintenance of body heights and kyphotic angles, we evaluated the changes of radiological parameters after VP. The maintenance rate (MR) of the vertebral BH were calculated using the following formulae: MR of the vertebral BH = postop-1y BH/postop-1w BH. Furthermore, the difference of the KA (DKA) were calculated using the following formulae: DKA = postop-1y KA − postop-1w KA. MR or DKA indicated the maintenance of BH or KA of the cemented vertebrae after VP. Refracture was defined as a 15% decrease in ABH or MBH (MR < 0.85) and 8° decrease in KA (DKA > 8°) compared with those at postoperative 1 week. MR or DKA indicated the maintenance of BH or KA of the cemented vertebrae after immediate reduction by VP.
Clinical outcomes
Patient-reported outcomes of the case-matched VP and TP groups were evaluated preoperatively and more than 1 year postoperatively. The preoperative visual analogue scale (VAS) and Oswestry disability index (ODI; Chinese version)32 were recorded by reviewing charts, and the postoperative outcomes were obtained through phone interviews.
Statistical analysis
These results are presented as the mean ± standard deviation. We used Prsim 8 for conducting statistical analysis and SAS 9.4 to match the patients between the VP and TP groups. Student’s unpaired two-tailed t-test was used for comparing the radiological outcomes of the two groups at each time point. Mann-Whitney test was used for ranking parameters. The chi-squared test was used for comparing noncontinuous parameters. Intraclass correlation coefficient estimates and their 95% confident intervals were calculated using SPSS statistical package version 20 (SPSS Inc, Chicago, IL) based on a single-rating, consistency, 2-way mixed effects model33.
Results
Comparison of TP and VP group
A total of 167 OVCFs in 133 patients were treated with VP without TP (VP group), and 35 OVCFs in 21 patients were treated with VP and TP (TP group). No significant differences in age, gender, fracture level, and body mass index (BMI) were observed between the TP and total VP groups, except BMD (TP vs. VP: −2.68 ± 0.98 vs. −1.9 ± 1.32, p < 0.01) (Supplement Table 1). The comparison of radiological outcomes between the TP group and the all VP patients (n = 113) was shown in the supplement material (Supplement Fig. 1). After we matched the VP group to the TP group, there were 38 OVCFs in 29 patients (VP group). Furthermore, no differences in age, gender, fracture level, BMI, BMD, ODI, preoperative and postoperative-1-week radiological parameters were observed between the TP and VP groups, but preoperative pain VAS was reported more intense in TP group (Table 1).
Radiological outcomes
First, the radiological outcomes of the TP group were compared with those of the VP group (Table 1). No difference in postop-1y KA was observed in either group (VP group vs. TP group: −4.97° ± 12.05° vs. −2.85° ± 12.21°, p = 0.462). DKA was more efficient in the TP group than in the VP group (VP group vs. TP group: −5.59° ± 7.31° vs. −2.14° ± 4.16°, p = 0.008) (Fig. 3A). Postop-1y ABH was significantly higher in the TP group than in the VP group (VP group vs. TP group: 1.56 ± 0.48 cm vs. 1.84 ± 0.56 cm, p < 0.01). ABHMR was significantly more efficient in the TP group (VP group vs. TP group: 0.79 ± 0.11 vs. 0.89 ± 0.09, p < 0.0001) (Fig. 3B). Postop-1y MBH was significantly higher in the TP group than in the VP group (VP group vs. TP group: MBH 1.49 ± 0.39 cm vs. 1.73 ± 0.41 cm, p = 0.017). MBHMR was significantly more efficient in the TP group (VP group vs. TP group: 0.80 ± 0.09 vs. 0.89 ± 0.09, p < 0.0001) (Fig. 3C). Furthermore, the refracture rates of KA, ABH, and MBH were significantly lower in the TP group compared with the VP group 1 year after VP (VP group vs. TP group: KA 42.11% vs. 8.57%, p = 0.001; ABH 76.32% vs. 28.57%, p < 0.0001; MBH 76.32% vs. 28.57%, p < 0.0001) (Table 2).
Clinical outcomes
Preoperative pain VAS and ODI were significantly improved in both the TP and VP groups. No significant difference was observed between the two groups in terms of postop-1y pain VAS and its improvement and ODI (Table 2).
Single-level subgroup analysis
In the comparison of single-level VP and TP groups, there was no differences in age, gender, BMI, BMD, preoperative ODI, preoperative pain VAS, preoperative and postoperative 1 week radiological parameters were observed between the TP and VP groups, except preoperative ABH of TP group was significantly greater (Table 3).
Radiological outcomes
No difference in postop-1y KA and DAK was observed in either group (Single-level VP group vs. TP group: postop-1y KA − 7.71° ± 10.7° vs. −2.18° ± 12.3°, p = 0.18; DKA − 5.42° ± 6.49° vs. −2.42° ± 5.05°, p = 0.175). (Fig. 4A). Postop-1y ABH was significantly higher in the TP group than in the VP group (Single-level VP group vs. TP group: 1.52 ± 0.42 cm vs. 1.95 ± 0.5 cm, p = 0.011). ABHMR was significantly more efficient in the TP group (Single-level VP group vs. TP group: 0.79 ± 0.09 vs. 0.89 ± 0.09, p = 0.011) (Fig. 4B). Postop-1y MBH was significantly higher in the TP group than in the VP group (Single-level VP group vs. TP group: MBH 1.48 ± 0.35 cm vs. 1.8 ± 0.38 cm, p = 0.019). MBHMR was significantly more efficient in the TP group (Single-level VP group vs. TP group: 0.81 ± 0.07 vs. 0.89 ± 0.06, p = 0.003) (Fig. 4C).
Clinical outcomes
Pain VAS improvement in TP group was significant greater (Single-level VP group vs. TP group: 4.27 ± 2.72 vs. 7.22 ± 2.77, p = 0.028). No significant difference was observed between the two groups in terms of postop-1y pain VAS and ODI, (Table 3).
Multilevel subgroup analysis
In the comparison of multilevel VP and TP groups, there was no differences in age, gender, BMI, BMD, preoperative ODI, preoperative pain VAS, preoperative and postoperative 1-week radiological parameters were observed between the TP and VP groups. However, there were more patients who had fractures at the same time in VP group than in TP group (Multilevel VP vs. TP group: 5 (83%) vs. 1 (14%), p = 0.041) (Table 4).
Radiological outcomes
No difference in postop-1y KA and DAK was observed in either group (Multilevel VP group vs. TP group: postop-1y KA −2.82° ± 12.9° vs. −1.98° ± 12.44°, p = 0.927; DKA − 5.94° ± 8.84° vs. −1.98° ± 3.71°, p = 0.071). (Fig. 5A). Postop-1y ABH was not different between two groups (Multilevel VP group vs. TP group: 1.58 ± 0.54 cm vs. 1.78 ± 0.59 cm, p = 0.324). ABHMR was significantly more efficient in the TP group (Multilevel VP group vs. TP group: 0.77 ± 0.14 vs. 0.89 ± 0.09, p = 0.005) (Fig. 5B). Postop-1y MBH was not different between two groups (Multilevel VP group vs. TP group: MBH 1.48 ± 0.42 cm vs. 1.69 ± 0.43 cm, p = 0.171). MBHMR was significantly more efficient in the TP group (Multilevel VP group vs. TP group: 0.79 ± 0.12 vs. 0.89 ± 0.11, p = 0.015) (Fig. 5C).
Clinical outcomes
Postop-1y pain VAS and ODI in TP group was significant greater (Multilevel VP group vs. TP group: VAS 2 ± 2 vs. 4.17 ± 2.04, p = 0.048; ODI 20.8 ± 17.2 vs. 39.33 ± 9.09, p = 0.048). (Table 4).
Discussion
Based on this study, OVCF patients in the TP group had significantly lower refracture rates than those in the VP group 1 year postoperatively. ABH, MBH, and KA were all favorable in the TP group. TP was associated with better maintenance effects in ABH, MBH, and KA. The pain VAS and ODI were significantly reduced 1 year after VP in both the groups. Most importantly, TP was associated with better improvement of pain VAS in those with single-level VP procedure. The beneficial effects of TP for VP-treated OVCFs were first demonstrated in our study.
Our study showed that TP may reduce the risk of refracture in cemented vertebrae after VP for OVCFs. The risk factors for refracture comprise inherent and procedure-related risk factors. The inherent risk factors are low BMD1 (T score < −2.2), old age1, loss of preoperative ABH1, a history of other fractures34, a greater local KA and a greater sagittal index35, and glucocorticoid-induced osteoporosis36,37. The procedure-related risk factors are receiving KP38, a lower volume of injected cement38, significant ABH restoration2,4,5, and solid lump filling cement2. Moreover, vertebral bone marrow integrity assessed through quantitative preprocedural MRI is associated with refracture3. Although many risk factors have been identified in previous studies, there is little information about refracture prevention. In our previous study, KP using IRD was demonstrated to be associated with significantly lower refracture rates than VP alone6. In addition, the current study demonstrated that TP was also a preventive factor for refracture.
Our study first demonstrated that TP was still beneficial in a fractured and cemented bony environment. TP was used for not only increasing BMD but also enhancing bone healing. Li N. et al.39 proved that TP boosts early-stage fracture healing by upregulating the levels of osteogenesis-specific Runx2 mRNA and protein expression in a rat model. Lin et al.40 presented that TP increased the union rate in a mouse atrophic nonunion model through cortical bridging of the fracture gap with mature bone. In an animal model and clinical data41, TP improved osteointegration of implant through the thickening of bone trabeculae and increased bone mass in the peri-implant area. However, no study has assessed whether TP could reduce the risk of refracture of cemented vertebrae. The local bone environment inside the fractured vertebrae is complicated by cement, and therefore, bone healing is compromised31. A histological study of the human vertebra revealed the presence of necrotic bone tissue, foreign body giant cells, and macrophages in the fibrous membrane surrounding cement31. These inflammatory changes inside the cemented vertebrae may hinder bone healing42. In our study, TP was significantly associated with greater BH and KA, suggesting that TP enhances bone formation even in a fractured, inflammatory, and cemented bony environment.
Our current study demonstrated that BH and KA were restored immediately after VP to a certain extent, and TP maintained the BH and KA that were restored through VP after 1 year. Our previous study indicated that BH and KA improved immediately after VP but decreased gradually after 6 months6. The immediate post-VP improvement in BH and KA resulted from the positional reduction during VP, but their restorations disappeared gradually 6 months later. To evaluate the maintenance after VP, MR was calculated by comparing BH and KA to those at immediate post-VP period. BH was significantly higher in the TP group 1 year after VP than in the VP group (Figs. 3 and 4). The postop-1y improvement in ABH or MBH in the TP group was due to better MR. BH was significantly improved with TP through long-term maintenance and not by immediate restoration. By contrast, KP with IRD led to significantly greater improvement in BH through immediate restoration6. Postop-1y KA in the TP group was greater although no significance was observed. TP was associated with better KA maintenance, suggesting its long-term maintenance effect.
The benefit of TP in clinical outcome was not evident in the whole group comparison, but the subgroup analysis revealed that TP was associated with the better pain VAS improvement in single-level group. Although these two groups were matched for some characteristics, they were different in characteristics of multiple fractures. Thereafter, when only single-level group were compared, the benefit of TP was evident in this simple condition. However, when multilevel group were compared, the multilevel TP group had worse clinical outcome than the multilevel VP group. It should not be interpreted as the adverse effect of TP on clinical outcomes because patients in TP group tended to have worse clinical conditions because of the indications for TP. In this retrospective study, TP was used for the patients with severe osteoporosis or those with more tendency to have a subsequent fracture. Accordingly, patients in multilevel TP group had more fractures. In multilevel TP group, 4 out of 8 patients had> or = 3 level fractures while only 1 of 7 patients in multilevel VP group had> or = 3 level fractures. Patients with more fractures tended to report worse clinical outcomes. In addition, 7 (86%) patients of multilevel TP group suffered from fractures at distant time while 2 (17%) of multilevel VP group suffered from fractures at distant time (Table 4). Actually, those 7 patients of multilevel TP gorup suffered from a subsequent fracture less than 3 months after the first fracture. Repeated fractures in a short duration may make the clinical outcomes worse, since the adverse effects of the first fracture do not cease yet. A study with larger sample size and the same selection criteria for both TP and VP group is needed to elucidate the benefit of TP in the future.
This study had some limitations. Data in this retrospective study were obtained from a single medical hospital, and the study had a relatively small sample size along with a relatively short follow-up duration of 1 year. The selection criteria of surgical procedures varied among the surgeons in this study. Therefore, a long-term, prospective multicenter study enrolling a large sample size with a favorable follow-up rate is warranted.
Conclusion
TP after VP was associated with higher BH and fewer refractures than VP alone, with comparable clinical outcomes 1 year after VP. TP may be associated with better improvement of pain VAS in those with single-level VP procedure. Higher BH was due to the more efficient maintenance effect that was associated with TP.
Change history
29 April 2024
A Correction to this paper has been published: https://doi.org/10.1038/s41598-024-60531-7
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Acknowledgements
Jiann-Her Lin’s work has been funded by Taipei Medical University and Taipei Medical University Hospital (108TMU-TMUH-08 & TMU107-AE1-B24) & Ministry of Science and Technology in Taiwan (MOST108-2321-B-001-028-MY2; MOST107-2314-B-38-041-MY3)
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Yi-Shan Yang & Yi-Syue Tsou measured the radiological outcomes; Wen-Cheng Lo & Yung-Hsiao Chiang supported the administrative work; Jiann-Her Lin did the analysis and wrote the manuscript.
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The original online version of this Article was revised: The original version of this Article contained an error in Affiliation 2, which was incorrectly given as ‘Department of Surgery, School of Medicine, Taipei Medical University, Taipei, Taiwan’. The correct affiliation is listed here: Division of Neurosurgery, Department of Surgery, School of Medicine, College of Medicine, Taipei Medical University, Taipei 11031, Taiwan
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Yang, YS., Tsou, YS., Lo, WC. et al. Teriparatide Associated with Fewer Refractures and Higher Body Heights of Cemented Vertebrae after Vertebroplasty: A Matched Cohort Study. Sci Rep 10, 6005 (2020). https://doi.org/10.1038/s41598-020-62869-0
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DOI: https://doi.org/10.1038/s41598-020-62869-0
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