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Factors and Strategies for Poor Pain Relief after Vertebroplasty: A Literature Review

Article Information

Binbin Tang, Kang Liu, Xiaolin Shi, Yuliang Huang*

Department of Orthopedics, The Second Affiliated Hospital of Zhejiang Chinese Medical University (Xinhua Hospital of Zhejiang Province), Hangzhou, China.

*Corresponding Author: Yuliang Huang, Department of Orthopedics, The Second Affiliated Hospital of Zhejiang Chinese Medical University (Xinhua Hospital of Zhejiang Province), Hangzhou, China.

Received: 31 October 2022; Accepted: 08 November 2022; Published: 02 December 2022

Citation:

Tang B, Liu K, Shi X, Huang Y. Factors and Strategies for Poor Pain Relief after Vertebroplasty: A Literature Review. Journal of Orthopedics and Sports Medicine 4 (2022): 309-316.

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Abstract

Study Design: Literatures review

Objective: To search and review the causes and measures to Poor Pain Relief (PPR) after vertebroplasty for Osteoporotic Vertebral Compression Fractures (OVCFs) in short period postoperatively.

Summary of Background Data: Vertebroplasty are more and more common for OVCF patients. However, various treatments on postoperative residual pain have been reported heavily. The PPR has been disturbing many doctors and affects the symptoms of patients. Therefore, we reviewed relevant articles in an attempt to obtain meaningful evidence on factors and strategies for PPR.

Methods: We set the priority of comparatively observational clinical study for review. PubMed, Web of Science, Embase, CNKI, WanFang, and VIP were searched for the treatment of OVCFs with vertebroplasty and to evaluate the clinical efficacy.

Results: 817 references were electronically retrieved, 48 full-text papers were screened, and 36 studies were included. Seventeen trials presented factors for PPR, mainly including bone cement-related, operation-related and patient-related factors. Nineteen studies showed strategies for PPR, including anti-osteoporosis treatments, surgical operation improvement and addition of other therapies. 15 prospective, 19 retrospective and 2 meta-analyses comprised the systematic review. The quality of included studies was generally low, especially in some controlled studies with an unclear risk of bias.

Conclusions: Bone cement distribution and operative errors are main causes of PPR after vertebroplasty. Many therapeutic methods are available to relieve this pain and restore function but with sparse evidence. We still value and implement

Keywords

Poor pain relief; Vertebroplasty; Osteoporotic vertebral compression fractures; Bone cement; Zoledronic acid

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Article Details

Abbreviations:

PPR: Poor Pain Relief; OVCF: Osteoporotic Vertebral Compression Fracture; OP: Osteoporosis; PVP: Percutaneous Vertebroplasty; PKP: Percutaneous Kyphoplasty; BMD: Bone Mineral Density; MRI: Magnetic Resonance Image; ZOL: Zoledronic acid; PMMA: Polymethyl Methacrylate; MC-PMMA: Mineralized Collagen Polymethyl Methacrylate; ESWT: Extracorporeal Shock Wave Therapy

1. Introduction

The aging population is already a major social issue in the world today. The problem is mainly manifested by the increasing elderly people and following health problems. Osteoporosis (OP) is a common disease characterized by bone loss, bone strength decline and bone microstructure degeneration in the elderly. Osteoporotic Vertebral Compression Fracture (OVCF) is the most common complication and can lead to weight-bearing postures or spine deformities. This pain and deformity seriously affect their normal life. Conservative treatment or prolonged bed rest is not effective in relieving pain and sometimes even worsens it. With the development of spinal minimally invasive surgery, Percutaneous Vertebroplasty (PVP) and Percutaneous Kyphoplasty (PKP) have become useful and affective methods of treating OVCF. They can relieve pain immediately, facilitate functional activities and reduce other complications [1,2]. However, post-vertebroplasty patients with Poor Pain Relief (PPR) were frequently reported in literatures in the short period, usually three days after operation, even affecting their long-term follow-up.

At present, there are few reports on the causes and measures of poor pain relief in patients after vertebroplasty. Therefore, we want to systematically review the relevant literatures and obtain more and better answers to this question. The purpose of this article is to analysis and discusses factors and strategies for PPR after vertebroplasty from relevant studies.

2. Methods

2.1 Search strategy

We searched 6 databases including PubMed, Web of Science, Embase, CNKI, WanFang, and VIP in order to obtain more comprehensive results. We set the search terms as "Osteoporotic Vertebral Compression Fractures or OVCF" and "postoperative pain" and the retrieved literature was journal literature. The publication region and country was not limited, the language was English or Chinese and the publication period was from January 2016 to September 2020.

2.2 Inclusion criteria

817 literatures were retrieved. Firstly, 769 duplicate and irrelevant articles were removed based their titles and abstracts. Secondly, we removed 12 articles, 4 of which were simple reviews and 8 of which didn’t have English titles and abstracts. Finally, 36 studies were used for date extraction and discussion of results. According to the information from these studies, factors and strategies were categorized into three types. 17 articles reported relevant factors (bone cement related: 10, operation related: 3 and patient related: 4). 19 articles reported new strategies (anti-osteoporosis treatments: 8, surgical operation improvement: 6 and addition of other therapies: 5). 15 prospective, 19 retrospective and 2 meta-analyses together comprised the systematic review. The flow chart below can be seen clearly (Figure 1).

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Figure 1: Flow chart of selection of related literatures review.

3. Results

3.1 Description of included studies

According to these 36 studies, we categorized and listed them in two Tables 1 and 2. In factor-related Tables 1 and 2, we set the items as Factor, Author/Year, Operation, Study Type and Better Pain Relief, which could be found in Table 1. The item of better pain relief is the probable cause of pain improvement. We set the items as Author/Year, Study Type, Test group, Control group and Better group, which could be found in Table 2. Better group means that better measure was taken.

3.2 Factors on Post-Vertebroplasty Poor Pain Relief (PPR)

The percentage of Post-Vertebroplasty Poor Pain Relief (PPR) ranges from 4-15% [3-5]. Considering elderly patients, only better pain and functional recovery will allow them to enjoy their late years. Several large-sample retrospective studies found that postoperative pain and bone mineral density, severe back soft tissue injury, bone cement features, lumbar facet joint violation, bone cement leakage or residual and others are mainly related [3-6], but no uniform understanding has been established. According to the current situation, we explored the causes of PPR mainly from three aspects: bone cement, operation and patient-related reasons from the literature search.

First Author/Year

Operation

Study Type

Better Pain Relief

Factor, No.

Liu C [7], 2018

PVP

Prospective

Well distribution in the fracture line

1

Ye L [8], 2018

PVP

Retrospective

Well distribution in the fracture line

1

Liu H [9], 2019

PKP

Retrospective

Confluent distribution

1

He S [10], 2019

PKP

Retrospective

“H” shape distribution

1

Tan L [11], 2020

PVP

Retrospective

Distribution contacted both the upper and lower endplates

1

Guo Z [12], 2017

PVP

Prospective

High viscosity

2

Xu M [13], 2017

PVP

Meta-analysis

High viscosity

2

F G [14], 2019

PVP

Prospective

No difference

2

Li K [15], 2020

PVP

Prospective

No difference

2

Miao F [16], 2020

PVP

Prospective

No difference

2

Liu J [17], 2017

PVP

Retrospective

Low score in residual

3

Yan S [18], 2017

PVP

Retrospective

Low score in residual

3

Li Y [19], 2018

PKP

Retrospective

No violation

4

Shen Y [20], 2016

PVP

Retrospective

Undeclined BMD

5

Cao J [21], 2016

PVP

Meta-analysis

Normal BMD

5

Peng K [22], 2018

PKP

Retrospective

No soft tissue injury on low back

6

Xu W [23], 2018

PVP

Prospective

Moderate(25-75%)degree

7

PVP: Percutaneous Vertebroplasty. PKP: Percutaneous Kyphoplasty. 1: Bone cement distribution 2: Bone cement viscosity 3: Pedicle Residual Bone Cement 4: Facet Joint Violation 5: Bone Mineral Density (BMD) 6: Soft Tissue Injury 7: Bone Marrow Edema

Table 1: Literatures List on the factors (bone cement-related, operation-related, patient-related) of poor pain relief.

Author/ Year

Study type

Test group

Control group

Better Group

Strategy, No.

Shi et al. [24], 2018

Retrospective

PKP and ZOL

PKP or ZOL

Test group

1

Huang et al. [25], 2019

Retrospective

PKP and ZOL

PKP Test group

Test group

1

Huang et al. [26], 2019

Prospective

PKP and ZOL

PKP

Test group

1

Zheng et al. [27], 2019

Prospective

PKP and ZOL

PKP

Test group

1

Hu et al. [28], 2020

Retrospective

PVP, ZOL and Ca

PVP and Ca

Test group

1

Huang et al. [29], 2020

Retrospective

PVP,ZOL and VK2

PVP,Ca and VD

Test group

1

Li et al. [30], 2020

Retrospective

PVP, ZOL and Rosuvastatin

PVP and Ca

Test group

1

Kong et al. [31], 2019

Retrospective

PKP and 12-month TPTD

PKP, Ca and VD

Test group

1

Xu [32], 2018

Retrospective

Bone filling bag vertebroplasty

PKP

No difference

2

Yuan et al. [33], 2020

Prospective

Low-dose targeted PVP

Traditional PVP

No difference

2

Noriega et al. [34], 2019

Prospective

TIVAD vertebroplasty

PKP

Test group

2

Zhu et al. [35], 2019

Retrospective

MC-PMMA cement PKP

PMMA cement PKP

Test group

2

Wang et al. [36], 2018

Retrospective

MC-PMMA cement PVP

PMMA cement PVP

No difference

2

Jiang et al. [37], 2020

Retrospective

MC-PMMA cement PVP

PMMA cement PVP

No difference

2

Liu [38], 2019

Prospective

Pregabalin

/

Test group

3

Li [39], 2020

Prospective

ESWT

Celecoxib Capsules oral

Test group

3

Du [40], 2019

Prospective

Radiofrequency needle knife and Xianling Gubao capsules

Radiofrequency needle knife

Test group

3

Li [41], 2019

Prospective

Shentong Zhuyu decoction

/

Test group

3

Zhang [42], 2019

Prospective

TCM five-tone therapy and Conventional treatment

Conventional treatment

Test group

3

ZOL: Zoledronic acid. Ca: Calcium supplements. VK2: Vitamin K2. VD: Vitamin D. TPTD: Teriparatide. TIVAD: Titanium Implantable Vertebral Augmentation Device. PMMA: Polymethyl Methacrylate. MC: Mineralized Collagen. ESWT: Extracorporeal Shock Wave Therapy. TCM: Traditional Chinese Medicine. /: no therapy. 1: Improve osteoporosis. 2. Reform operation. 3. Add other therapies.

Table 2: Literatures list on strategies (anti-osteoporosis treatments,surgical operation improvement and addition of other therapies) on poor pain relief.

3.3 Feasible strategies on Post-Vertebroplasty Poor Pain Relief (PPR)

By searching the literatures, we analyzed three main strategies on the pain relief after vertebroplasty. We discussed and analyzed them in terms of anti-osteoporosis treatments, surgical operation improvement and other therapies.

4. Discussion

4.1 Bone cement affecting pain relief

The mechanism by which the bone cement produces its effect is as follows. Bone trabecular fractures in the vertebral body are stabilized by the diffusion of bone cement to form a riveting effect, the axial pressure can be supported by filled bone cement, and the pain nerve endings will be damaged by thermal energy come from bone cement. Therefore, it is speculated that there is a possible relationship between the distribution of bone cement and postoperative residual pain. From 2018 to 2020, 5 articles [7-11] (1 prospective and 4 retrospective) with 2024 cases were retrieved for in-depth research about bone cement distribution. While the level of evidence in five articles is relatively low, important information has been extracted from these studies. More than 50% of vertebral bodies in the area of bone cement distribution get better pain and functional scores on the day after PVP [7]. Bone cement did not diffuse to the upper facture line, resulting in poor pain relief for 26 (11.6%) patients, which was reported by Ye et al [8]. One large samples study found that bone cement confluent distribution provided better pain relief than separated distribution if doctor used bilateral operation [9]. Similarly, He et al. [10] also found “H-shaped” distribution gained lower pain scores than "O-shaped" distribution. The distribution that touched upper and lower endplates showed better pain relief as well [11]. These above studies have explained that the distribution of bone cement is related to postoperative residual pain. More careful observation on the fracture line can ensure optimal bone cement diffusion.

In addition to the bone cement distribution, does the viscosity of bone cement affect the pain relief after vertebroplasty? Low viscosity is considered to be a main factor contributing to the leakage of bone cement, resulting in serious complications such as acute spinal cord or nerve root compression, paraplegia, cemented pulmonary embolism, and intervertebral disc degeneration [12-14]. It was reported that high-viscosity bone cement could reduce leakage and upgraded efficacy. While many studies have published results, it is unclear whether different bone cement viscosity affects pain relief after vertebroplasty. In recent years, four prospective studies [12,14-16] and one meta-analysis [12] on viscosity has been published with a high level of evidence. Of the 4 prospective studies, three articles came to the same conclusion that there was no significant difference in pain between high or low viscosity bone cement [14,15,16], and only one article concluded that higher viscosity bone cement resulted in better pain relief [12]. A meta-analysis of 6 RCT studies showed that high-viscosity bone cement was superior in terms of pain improvement, functional recovery and bone cement leakage, but not to the extent that pain relief developed. Therefore, high-viscosity bone cement cannot help pain better according to the current evidence. In a word, we believe that pain relief after vertebroplasty is closely related to the distribution of vertebral body. There is a controversy regarding the viscosity of the bone cement.

4.2 Operational way affecting pain relief

There were some literatures discussing the relationship between surgical operation and pain relief after vertebroplasty. At present, it has been demonstrated there is no difference between PKP and PVP in terms of pain relief and function recovery. And unilateral or bilateral percutaneous has no significance in the short term. Then, we found that improper operation probably affect the pain relief after vertebroplasty. In these studies, pedicle residual bone cement and facet joint violation were the two main factors affecting the pain relief [17-19]. Residual bone cement internal and external of pedicle was positively associated with pain relief in OVCF cases with vertebroplasty [17]. Facet joint invasion was found in patients who underwent unilateral PKP, and these patients had higher pain and dysfunction scores at a short-term follow-up of 1 month [19]. Pedicles rupturing were reported in earlier articles, as surgeon overdid the puncture angle, resulting in bone cement residue or leakage. Bone cement residual in the vicinity of fractured pedicle can lead to poor pain relief, which should be paid attention to. Puncturing repeatedly may damage the facet joint violation and other surrounding normal tissues, which should be avoided and considered as one reason for poor pain relief.

Another factor is the timing of surgery, but there is controversy at present. Yan et al. [18] believed pain relief was better when operation was performed within 1-3 weeks than when it was longer than 3 weeks [43], but another study found that no significant difference between operation within and beyond 4 weeks [44].

4.3 Patient-related reasons affecting pain relief

Four studies of Shen et al., Cao et al., Ke-jun, Xu et al. [20-23] reported the patient’s Bone Mineral Density (BMD), soft tissue injury and bone marrow edema were related to pain relief after vertebroplasty. BMD is the main factor affecting pain relief in the short or medium period. Lower BMD t value often represents higher visual analog scales of back pain [20,21]. The situation of soft tissue injury to the back or lumbar region can be found on MRI when vertebral compression fractures occur. Severe soft tissue injury has become an important factor affecting early pain relief. Peng K et al. reported the effect of soft tissue injury on pain relief and spine movement [22]. Xu W et al. reported that the best pain relief was obtained in 25-75% of bone marrow edema range on MRI [23]. However, we cannot obtain clear results from few reports.

4.4 Anti-osteoporosis treatment improving PPR

There have been few reports of unsatisfactory postoperative pain relief due to low bone density in recent years. However, many researchers regarded the zoledronic acid (ZOL) as the treatment for patients with severe osteoporosis who have residual pain after vertebroplasty. Zoledronic acid could inhabit osteoclasts differentiate and proliferate, regulate bone metabolism and reduce bone loss. Through searching, there were 6 retrospective studies [24-31] and 2 prospective studies [26,27]. 7 studies [24-29,31] reported the effect of ZOL and one study [31] reported the effect of Teriparatide.1416 cases, 574 cases in test group and 842 cases in control group, who had postoperative PPR were observed. The level evaluation of the 8 articles indicated relatively low evidence because of more retrospective studies. PVP combined with ZOL for postmenopausal OVCF patients showed better postoperative pain relief, BMD and osteocalcin expression than either PKP alone or ZOL alone [24-28]. On the basis of PVP and ZOL, osteosynthetic drugs, such as vitamin K2 [29], Statins [45,46] and Teriparatide [31] were also effective, with patients in the test group achieving better pain ease, functional recovery and fewer fractures. However, these studies were conducted with long-term follow-up results in the absence of postoperative pain score. Whether ZOL or other anti-osteoporosis drugs can improve the PPR after operation remains a question.

4.4 Surgical operation improvement improving PPR

While the operation of PKP or PVP combined with injection of Polymethyl Methacrylate (PMMA) bone cement has become an essential technique for surgeons, every technique needs to be improved for better clinical outcomes. Bone filled bag vertebroplasty, which is basically the same as PKP operation, is more effective in relieving pain [32]. Good bone cement distribution is considered as an important condition on good pain relief. Thus, Targeted puncture and low-dose bone cement was a new method proposed by Yuan L et al. [33], but there was no significant difference in pain relief at present stage in his study. SpineJack device technology was also a new operation reported by Noriega et al. [47] in 2015. Multi-center RCTs told us that this device had lower pain scores during follow-up 6 months after surgery and no earlier results [34]. We hope that more studies involving this device can give us meaningful results. Certainly, the improvements also have occurred with bone cement. It is reported that mineralized collagen Polymethyl Methacrylate (MC-PMMA) bone cement has better bioresorbability and biocompatibility [35-37]. In terms of pain relief after operation, MC-PMMA bone cement was not significantly different from regular bone cement [36,37]. Observing the 1-year follow-up, Zhu J et al. [35] found the Mineralized bone cement showed better pain relief and functional improvement. Other methods to improve short-term pain relief include the following. Vertebral anesthesia (into the vertebral body), reported by Mao G et al. [48] was better than conventional local anesthesia (to the surface of the periosteum) in terms of pain relief at 12h and 24h after operation. Ying et al. [49] considered the relationship between setting temperature of bone cement and residual pain, but there was insufficient evidence of pain relief.

4.5 Addition of other therapies improving PPR

This part aims to improve the PPR after vertebroplasty with a number of effective treatments. These included various therapies from western medicine and Chinese medicine, but the level of evidence is generally low. Pregabalin is an analgesic that provides good pain relief after PVP treatment with relative safety and certain efficacy [38]. Extracorporeal Shock Wave Therapy (ESWT) is an effective and physically acceptable treatment for postoperative pain, which was reported by Li et al. in 62 cases with PPR [39]. Chinese Medicine theory and therapy also play a significant role in the residual pain after vertebroplasty in OVCF patients, as demonstrated in the following studies. Xianling Gubao capsule is a proprietary Chinese medicine that improves bone density, promotes fracture healing, and effectively relieves osteoporotic pain. Du et al. [40] reported that Xianling Gubao capsules can effectively and quickly relieve lumbar and back pain. Another Chinese decoction called Shentong Zhuyu decoction was created by Wang Qingren, a famous doctor in the Qing Dynasty. Relative studies reported that Shentong Zhuyu decoction can accelerate the recovery from pain after operation by promoting the body’s absorption of blood stasis [41]. Chinese Medicine five-tone therapy organically combines the theory of the yin and yang and the five elements of TCM with music. It can regulate the patient's spirit, improve the function of patient’s internal organs and reduce pain after vertebroplasty [42,50,51]. All of these therapies mentioned above have shown beneficial clinical efficacy.

5. Conclusions

Although vertebroplasty has become the standard of the treatment for OVCF, postoperative pain relief varies among different patients. With the increase in OVCF and vertebroplasty, the issue of poor pain relief has attracted more attention. Therefore, this article reviewed and analyzed relevant factors and improvement strategies. It aims to summarize the latest research results and give guidance to doctors. We reviewed three common factors, including bone cement, surgical operation and patient’s problem. PPR is related to the distribution of bone cement. It is believed that the distribution of bone cement in the fracture region could relieve pain after operation. However, the nature of bone cement is not a factor.

Pedicle residual bone cement and facet joint violation should be aroused more attention during puncture. We believe that PPR in some patients stems from inappropriate technique.

Correspondingly, we reviewed three useful strategies, including improving osteoporosis, reforming surgical operation and adding other therapies. Currently, the application of anti-osteoporosis drugs, especially ZOL, has a positive effect on pain relief with fewer adverse effects, but it was not known for short-term pain. According to the studies on operational improvement, more follow-up is needed to confirm this and thus provide more evidence. As for other therapies, physical therapy and Chinese medicine treatment, etc. all has shown some efficacy. In our opinion, post-vertebroplasty poor pain relief is still a common problem. It is indispensable to first consider the cause of residual pain and then to choose a better strategy. In the end, we firmly believe that minimally invasive spine surgery should lead to better clinical efficacy in the near future.

Funding

This systematic review was supported by Zhejiang Province Natural Science Foundation (Grant No. LBY22H270005) and National Natural Science Foundation of China (Grant No. 82104891 and 82204829).

Conflict of Interest

Binbin Tang, Kang Liu, Xiaolin Shi and Yuliang Huang declare that they have no conflict of interest.

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