Pulmonary embolism with coexistent incidental pulmonary cement embolism post vertebroplasty

Comparative analysis of the safety and efficacy of fenestrated pedicle screw with cement and conventional pedicle screw with cement in the treatment of osteoporotic vertebral fractures: A meta-analysis

PURPOSE

Bone cement-reinforced fenestrated pedicle screws (FPSs) have been widely used in the internal fixation and repair of the spine with osteoporosis in recent years and show significant improvement in fixation strength and stability. However, compared with conventional reinforcement methods, the advantages of bone cement-reinforced FPSs remain undetermined. This article compares the effects of fenestrated and conventional pedicle screws (CPSs) combined with bone cement in the treatment of osteoporosis.

METHODS

A clinical control study of FPSs and CPSs combined with bone cement reinforcement in osteoporotic vertebral internal fixation was performed using the database PubMed, Embase, Cochrane Library, CNKI, the Wanfang, and the China Biomedical Literature Service System. Two evaluators screened the relevant literature in strict accordance with the inclusion criteria (diagnosis of participants, type of clinical study, treatment with FPS and CPS, and outcome indicators) and exclusion criteria (duplicate literature and missing or incorrect data) and independently conducted data extraction and quality evaluation. Clinical control studies of direct comparison between FPS and CPS combined with bone cement reinforcement in patients who were definitively diagnosed with thoracolumbar fractures or spinal degenerative diseases were included. Quality evaluation was conducted using the Cochrane risk bias evaluation tool for randomized controlled studies and using the Newcastle-Ottawa scale for retrospective case-control studies. RevMan software (version 5.3) was used for the meta-analysis to compare the clinical efficacy, radiological results, and related complications of the 2 methods.

RESULTS

A total of 13 articles were included, including 7 randomized controlled studies and 6 retrospective case-control studies. There were 909 patients in these studies, 451 in the FPS and polymethyl methacrylate (FPS & PMMA) group and 458 in the CPS and polymethyl methacrylate (CPS & PMMA) group. The results of the meta-analysis showed that there was no significant difference between the 2 groups in operation time, hospital stay, visual analogue score, Japanese orthopaedic association score, Oswestry disability index score, Cobb angle, vertebral body deformation index and fusion rate (p > 0.05). The mean difference of intraoperative bleeding volume was -10.45, (95% confidence intervals (CI) (-16.92, -3.98), p = 0.002), the mean difference of loss height of the anterior edge of the vertebral body after surgery was -0.69 (95% CI (-0.93, -0.44), p < 0.001), and the relative risk (RR) of overall complication rate was 0.43 (95% CI (0.27, 0.68), p < 0.001), including the RR of bone cement leakage rate was 0.57 (95% CI (0.39, 0.85), p = 0.005). The screw loosening rate (RR = 0.26, 95% CI (0.13, 0.54), p < 0.001) of the FPS group was significantly lower than that of the CPS group.

CONCLUSION

The existing clinical evidence shows that compared with the CPS combined with bone cement, the use of FPS repair in the internal fixation of an osteoporotic vertebral body can reduce the amount of intraoperative bleeding, be more conducive to maintaining the height of the vertebral body, and significantly reduce the incidence of postoperative complications such as bone cement leakage and screw loosening.

Cement-Augmented Pedicle Screw Fixation in Patients with Osteoporosis : Safety, Efficacy and Complications

Cement-augmented pedicle screw instrumentation is a widely accepted method for managing osteoporotic fractures, but it carries inherent risks, particularly related to cement leakage and embolism. This study aimed to analyze a clinical case of complications following cement fixation and provide a detailed review of relevant literature. A 70-year-old patient underwent transpedicular screw instrumentation from L2-L4 with polymethyl methacrylate augmentation, which resulted in cement leakage into the spinal canal and subsequent pulmonary embolism. After revision surgery and conservative treatment for the embolism, the patient's condition stabilized, demonstrating that conservative measures can be effective in managing cement embolism. To complement this case, a comprehensive literature review was conducted to explore the causes, prevention, and treatment of complications related to cement augmentation. The findings support that while cement-augmented pedicle screw instrumentation remains a leading technique for osteoporotic fractures, the associated risks are manageable with proper treatment protocols. This study holds practical significance for healthcare professionals by highlighting both the risks and solutions associated with cement fixation, thus contributing to improved patient outcomes and the development of standardized treatment guidelines.

Pulmonary cement embolism is frequently observed but not a contributing factor for death in patients with cemented total hip and knee arthroplasty: a postmortem study

Purpose

Bone cement is frequently used for implant fixation in orthopaedic surgery. The occurrence of pulmonary cement embolism (PCE) in hip and knee arthroplasty has been described previously, but the exact extent and frequency have not been adequately studied. A postmortem cohort provides a unique opportunity for a more detailed analysis of this phenomenon.

Methods

Through retrospective analysis of whole-body computed tomography (CT) scans and autopsy protocols, we identified 67 cases with previous cemented total hip or knee arthroplasties. A grading system originally developed for PCE after cemented spine procedures was used. Findings were compared with two control groups: 35 individuals with previous cementless total joint arthroplasty as well as 25 individuals without evidence of prostheses.

Results

PCE was detected in 46.3% of the cases: grade 1 (31.3%), grade 2 (10.5%), and grade 3 (4.5%). No statistically significant difference was found between hip and knee arthroplasties in terms of PCE frequency. Importantly, none of the autopsy reports listed PCE as a cause of death or a contributing factor for the patients’ death. In the two control groups, only one case per group was classified as grade 1 PCE, while the remaining cases did not show any evidence of PCE.

Conclusion

The presented data reveal a high frequency of PCE in hip and knee arthroplasties, which is almost identical to previous findings in patients with cement-augmented interventions in the spine. This way, our results underline the relevance of PCE after arthroplasty, suggesting an adaptation of surgical methods to minimize this complication.

Supplementary Information

The online version contains supplementary material available at 10.1007/s00264-022-05381-6.

Cement pulmonary embolism after percutaneous kyphoplasty: An unusual culprit for non-thrombotic pulmonary embolism

Non-thrombotic pulmonary embolism can occur from rare but diverse etiology and is not well understood. Increasing prevalence of osteoporosis in the aging population has contributed to increased utilization of percutaneous vertebral augmentation procedures of vertebroplasty and its recent modification, kyphoplasty. Though these procedures are relatively well tolerated, there is risk of potentially fatal complication of bone cement embolization to distant vasculature. We report a case of symptomatic pulmonary cement emboli developed 2 day's post kyphoplasty and its successful treatment with novel anticoagulant for 6 months. We also summarize evidence to assist clinicians and radiologists for early identification, treatment, and prevention of cement pulmonary emboli.