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Zang H, Hu A, Xu X, Ren H, Xu L. Development of machine learning models to predict perioperative blood transfusion in hip surgery. BMC Med Inform Decis Mak 2024; 24:158. [PMID: 38840126 PMCID: PMC11155147 DOI: 10.1186/s12911-024-02555-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2023] [Accepted: 05/28/2024] [Indexed: 06/07/2024] Open
Abstract
BACKGROUND Allogeneic Blood transfusion is common in hip surgery but is associated with increased morbidity. Accurate prediction of transfusion risk is necessary for minimizing blood product waste and preoperative decision-making. The study aimed to develop machine learning models for predicting perioperative blood transfusion in hip surgery and identify significant risk factors. METHODS Data of patients undergoing hip surgery between January 2013 and October 2021 in the Peking Union Medical College Hospital were collected to train and test predictive models. The primary outcome was perioperative red blood cell (RBC) transfusion within 72 h of surgery. Fourteen machine learning algorithms were established to predict blood transfusion risk incorporating patient demographic characteristics, preoperative laboratory tests, and surgical information. Discrimination, calibration, and decision curve analysis were used to evaluate machine learning models. SHapley Additive exPlanations (SHAP) was performed to interpret models. RESULTS In this study, 2431 hip surgeries were included. The Ridge Classifier performed the best with an AUC = 0.85 (95% CI, 0.81 to 0.88) and a Brier score = 0.21. Patient-related risk factors included lower preoperative hemoglobin, American Society of Anesthesiologists (ASA) Physical Status > 2, anemia, lower preoperative fibrinogen, and lower preoperative albumin. Surgery-related risk factors included longer operation time, total hip arthroplasty, and autotransfusion. CONCLUSIONS The machine learning model developed in this study achieved high predictive performance using available variables for perioperative blood transfusion in hip surgery. The predictors identified could be helpful for risk stratification, preoperative optimization, and outcomes improvement.
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Affiliation(s)
- Han Zang
- Department of Anesthesiology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences, Peking Union Medical College, Beijing, 100730, China
| | - Ai Hu
- Department of Anesthesiology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences, Peking Union Medical College, Beijing, 100730, China
| | - Xuanqi Xu
- Key Laboratory of High Confidence Software Technologies (Peking University), Ministry of Education, Beijing, 100084, China
- School of Computer Science, Peking University, Beijing, 100084, China
| | - He Ren
- Beijing HealSci Technology Co., Ltd., Beijing, 100176, China
| | - Li Xu
- Department of Anesthesiology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences, Peking Union Medical College, Beijing, 100730, China.
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Goel A, Viswanathan VK, Serbin P, Youngman T, Mounasamy V, Sambandam S. Ankylosing spondylitis substantially increases health-care costs and length of hospital stay following total hip arthroplasty - National in-patient database study. J Clin Orthop Trauma 2023; 39:102151. [PMID: 37123430 PMCID: PMC10130334 DOI: 10.1016/j.jcot.2023.102151] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/01/2022] [Accepted: 03/31/2023] [Indexed: 05/02/2023] Open
Abstract
Introduction The outcome following major arthroplasty surgeries in patients with ankylosing spondylitis (AS) has tremendously improved over the past decades, due to substantial amelioration in the medical therapies and sophistication of available surgical modalities. Although various studies have already demonstrated the complication rates and challenges faced in AS patients undergoing THA, there is a substantial paucity of data on the actual healthcare burden associated with this disease, and the diverse factors which may affect it. Methods Using the National Inpatient Sample (NIS) database (on the basis of ICD-10 CMP codes), patients undergoing THA between the years 2016 and 2019 were identified. These patients were then classified into two categories: group A: patients with a known diagnosis of AS; and group N: those without. The details regarding demographical information, associated co-morbidities, data pertaining to patients' hospital admissions including expenditure incurred, length of stay and complications encountered, were compared. In addition, propensity-score matching was performed to identify a 1:1 matched sample of THA patients without AS. Results Overall, 367,890 patients underwent THA; among whom, 501 (0.14%) were known AS patients (group A). Group A included a substantially higher proportion of patients belonging to younger age group (58.6 ± 13.4 versus 65.9 ± 11.4 years; p < 0.001), male sex (67.1% in group A vs 44.1% in group N; p < 0.001), and Asian ethnicity (p < 0.001). Group A patients had a substantially higher risk for longer duration of hospital stay (p < 0.03) and higher overall healthcare expenditure incurred (p < 0.001). As compared to group N, AS patients had a significantly higher risk for developing post-operative anemia [21.8% (group A) vs 11.8% (group N); p < 0.02]; and higher rate of periprosthetic infections [2.4% (group A) vs 1.0% (group N); p < 0.007]. Conclusion Patients with AS require a significantly longer duration of hospital stay and higher admission-related expenditure following THA, as compared to the general population. These enhanced early health care-associated costs can be attributed to higher complication rates in AS patients. AS patients are prone to higher rates of anemia and peri-prosthetic infections during the early post-THA period.
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Affiliation(s)
- Akshay Goel
- Department of Orthopaedic Surgery, Joan C. Edwards School of Medicine, Marshall University, Huntington, WV, USA
| | | | | | | | - Varatharaj Mounasamy
- Department of Orthopedic Surgery, University of Texas Southwestern, Chief of Orthopedics, Dallas VAMC, Dallas, TX, USA
| | - Senthil Sambandam
- Department of Orthopedic Surgery, University of Texas Southwestern, Chief of Orthopedics, Dallas VAMC, Dallas, TX, USA
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Bian T, Zhang L, Man S, Li H, Dou Y, Zhou Y. Predisposing factors for allogeneic blood transfusion in patients with ankylosing spondylitis undergoing primary unilateral total hip arthroplasty: a retrospective study. J Orthop Surg Res 2023; 18:9. [PMID: 36597109 PMCID: PMC9811782 DOI: 10.1186/s13018-022-03464-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/08/2022] [Accepted: 12/20/2022] [Indexed: 01/05/2023] Open
Abstract
BACKGROUND The transfusion rate is relatively high in patients with ankylosing spondylitis (AS) undergoing total hip arthroplasty (THA). However, relevant studies focusing on the predisposing factors for transfusion with a large sample size are lacking. This study aimed to investigate the incidence of and risk factors for allogeneic blood transfusion in patients with AS undergoing primary unilateral THA. METHODS This retrospective study included 331 patients with AS who underwent primary unilateral THA between 2011 and 2021. Relevant parameters were collected through a chart review. Multivariate logistic regression analysis was conducted to identify possible factors associated with perioperative allogeneic blood transfusion. RESULTS A total of 113 (34.1%) patients received perioperative allogeneic blood transfusions. Factors related to receiving an allogeneic blood transfusion included prolonged operative duration (odds ratio [OR] per 10 min = 1.139, P = 0.047), increased estimated intraoperative blood loss (OR per 100 mL = 1.348, P < 0.001), and increased postoperative drainage volume (OR per 100 mL = 1.235, P = 0.024). A higher body mass index (BMI) (OR = 0.914, P = 0.012), perioperative tranexamic acid (TXA) use (OR = 0.166, P < 0.001), and a higher preoperative hemoglobin level (OR per 1 g/dL = 0.744, P = 0.004) decreased the risk of transfusion. CONCLUSIONS In patients with AS undergoing THA, prolonged operative duration, increased estimated intraoperative blood loss, and increased postoperative drainage volume were found to be risk factors for transfusion, whereas a higher BMI, perioperative TXA use, and a higher preoperative hemoglobin level were protective factors. These results may aid in developing a better perioperative management strategy, ultimately reducing the need for transfusion.
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Affiliation(s)
- Tao Bian
- grid.11135.370000 0001 2256 9319Department of Orthopedic Surgery, Beijing Jishuitan Hospital, Fourth Clinical College of Peking University, No. 31 Xinjiekou East Street, Xicheng District, Beijing, 100035 China
| | - Liang Zhang
- grid.11135.370000 0001 2256 9319Department of Orthopedic Surgery, Beijing Jishuitan Hospital, Fourth Clinical College of Peking University, No. 31 Xinjiekou East Street, Xicheng District, Beijing, 100035 China
| | - Siliang Man
- grid.11135.370000 0001 2256 9319Department of Rheumatology and Immunology, Beijing Jishuitan Hospital, Fourth Clinical College of Peking University, No. 31 Xinjiekou East Street, Xicheng District, Beijing, 100035 China
| | - Hongchao Li
- grid.11135.370000 0001 2256 9319Department of Rheumatology and Immunology, Beijing Jishuitan Hospital, Fourth Clinical College of Peking University, No. 31 Xinjiekou East Street, Xicheng District, Beijing, 100035 China
| | - Yong Dou
- grid.11135.370000 0001 2256 9319Department of Orthopedic Surgery, Beijing Jishuitan Hospital, Fourth Clinical College of Peking University, No. 31 Xinjiekou East Street, Xicheng District, Beijing, 100035 China
| | - Yixin Zhou
- grid.11135.370000 0001 2256 9319Department of Orthopedic Surgery, Beijing Jishuitan Hospital, Fourth Clinical College of Peking University, No. 31 Xinjiekou East Street, Xicheng District, Beijing, 100035 China
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Li L, Fu J, Xu C, Guan H, Ni M, Chai W, Hao L, Zhou Y, Chen J. Factors associated with blood loss in ankylosing spondylitis patients with hip involvement undergoing primary total hip arthroplasty: a cross-sectional retrospective study of 243 patients. J Orthop Surg Res 2020; 15:541. [PMID: 33208176 PMCID: PMC7672842 DOI: 10.1186/s13018-020-02064-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/03/2020] [Accepted: 11/02/2020] [Indexed: 12/16/2022] Open
Abstract
Background Total hip arthroplasty (THA) can cause considerable blood loss and perioperative transfusion in ankylosing spondylitis (AS) patients. This study aimed to identify the factors related to blood loss in AS patients with hip involvement undergoing THA. Methods We analyzed 243 AS patients with advanced hip involvement undergoing primary THA from 2012 to 2017. Bilateral THA was performed by a one-stage operation during one general anesthesia session. The patients were divided into three groups according to the grade of blood loss, as determined by the Advanced Trauma Life Support hypovolemic shock classification system. Ordinal logistic regression was used to identify factors associated with blood loss in the patients. Results The proportion of patients who were male, underwent bilateral THA, had a hip range of motion (ROM) = 0°, had a BASRI-hip score of 4, underwent iliopsoas and adductor release, and underwent autologous or allogenic transfusion increased significantly with the grade of blood loss, while that of the patients who received tranexamic acid (TXA) decreased significantly (P < 0.05). The preoperative hemoglobin (Hb) level, hematocrit level, and operating time also increased significantly with the grade of blood loss (P < 0.05). The ordinal logistic regression results identified the factors related to blood loss during THA in AS patients with hip involvement to be the male sex (odds ratio [OR] = 3.287; 95% confidence interval [CI] 1.022, 10.567), bilateral THA (OR = 13.896; 95% CI 4.950, 39.011), hip ROM = 0° (OR = 2.513; 95% CI 1.277, 4.946), an elevated erythrocyte sedimentation rate (ESR) level (OR = 3.042; 95% CI 1.320, 7.014), an elevated preoperative Hb level (OR = 1.043; 95% CI 1.017, 1.070), a long operating time (OR = 1.009; 95% CI 1.003, 1.016), and the administration of TXA (OR = 0.252; 95% CI 0.134, 0.472). Conclusions The male sex, bilateral THA, a hip ROM = 0°, an elevated ESR level, a high preoperative Hb level, and a long operating time are risk factors associated with blood loss in AS patients with hip involvement undergoing THA, while the administration of TXA is a protective factor. These results might help determine the risk of bleeding in the perioperative assessment and develop more efficient blood management strategies for THA in AS patients with hip involvement.
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Affiliation(s)
- Liangliang Li
- Medical School of Chinese PLA, Beijing, China.,Department of Orthopaedics, The First Medical Centre, Chinese PLA General Hospital, Beijing, China.,Department of Orthopaedics, The Second Hospital of Shanxi Medical University, Taiyuan, Shanxi, China
| | - Jun Fu
- Department of Orthopaedics, The First Medical Centre, Chinese PLA General Hospital, Beijing, China
| | - Chi Xu
- Department of Orthopaedics, The First Medical Centre, Chinese PLA General Hospital, Beijing, China
| | - Haitao Guan
- Department of Orthopaedics, The First Medical Centre, Chinese PLA General Hospital, Beijing, China
| | - Ming Ni
- Department of Orthopaedics, The First Medical Centre, Chinese PLA General Hospital, Beijing, China
| | - Wei Chai
- Department of Orthopaedics, The First Medical Centre, Chinese PLA General Hospital, Beijing, China
| | - Libo Hao
- Department of Orthopaedics, The First Medical Centre, Chinese PLA General Hospital, Beijing, China.
| | - Yonggang Zhou
- Department of Orthopaedics, The First Medical Centre, Chinese PLA General Hospital, Beijing, China
| | - Jiying Chen
- Department of Orthopaedics, The First Medical Centre, Chinese PLA General Hospital, Beijing, China.
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Hu Y, Jiang WZ, Pan CL, Wang T. Active ankylosing spondylitis increases blood loss during total hip arthroplasty for a stiff hip joint. BMC Musculoskelet Disord 2020; 21:243. [PMID: 32293393 PMCID: PMC7158031 DOI: 10.1186/s12891-020-03278-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/07/2019] [Accepted: 04/07/2020] [Indexed: 12/17/2022] Open
Abstract
Background Total hip arthroplasty (THA) has been highlighted as the best treatment option for ankylosing spondylitis (AS) patients with advanced hip involvement. The huge blood loss associated with THA is a common concern of postoperative complications. Disease activity is a specific reflection of systematic inflammation of AS. The purpose of this study was to determine the effect of disease activity on blood loss during THA in patients with AS. Methods Forty-nine patients with AS who underwent unilateral THAs were retrospectively studied. Ankylosing Spondylitis Disease Activity Score (ASDAS) was employed to evaluate the disease activity. Orthopedic Surgery Transfusion Hemoglobin European Overview (OSTHEO) formula was used to assess the surgical blood loss. The patients were divided into active group (ASDAS≥1.3; n = 32) and stable groups (ASDAS< 1.3; n = 17) based on the ASDAS. Peri-operative laboratory values, plain radiographs, intra-operative data, transfusion volume, and use of hemostatic agents were recorded and statistically analyzed. Results The ASDAS, pre-operative C-reactive protein level, erythrocyte sedimentation rate, and fibrinogen concentration in the active group were higher than the stable group (all P < 0.05); however, the pre-operative hemoglobin concentration and albumin level were higher in the stable group (both P < 0.05). The total blood loss during THA in stable patients was 1415.31 mL and 2035.04 mL in active patients (P = 0.006). The difference between the two groups was shown to be consistent after excluding the gender difference (P = 0.030). A high transfusion rate existed in both groups (stable group, 76.47% with an average of 1.53 units; active group, 84.37% with an average of 2.31 units), but there was no significant difference between the two groups (both P > 0.05). Compensated blood loss, corresponding to transfusion, was noted significantly more in the active group compared to the stable group (P = 0.027). There was no significant difference with regard to functional recovery (P > 0.05). Conclusion Active AS patients are at high risk for increased blood loss during THA compared to stable patients. The underlying mechanism includes disorders of the coagulation and fibrinolytic systems, poor nutrition status, osteoporosis, imbalance of oxidative–antioxidative status and local inflammatory reaction. It is strongly recommended to perform THA in AS patients with stable disease.
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Affiliation(s)
- Yong Hu
- Department of Orthopaedic Surgery, The Fifth Affiliated Hospital of Southern Medical University, Southern Medical University, Guangzhou, Guangdong Province, China. .,Department of Orthopaedic Surgery, NanFang Hospital, Southern Medical University, Guangzhou, China.
| | - Wei-Zhou Jiang
- Department of Orthopaedic Surgery, NanFang Hospital, Southern Medical University, Guangzhou, China
| | - Cheng-Long Pan
- Department of Orthopaedic Surgery, The Fifth Affiliated Hospital of Southern Medical University, Southern Medical University, Guangzhou, Guangdong Province, China
| | - Tao Wang
- Department of Orthopaedic Surgery, The Fifth Affiliated Hospital of Southern Medical University, Southern Medical University, Guangzhou, Guangdong Province, China
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Pepe M, Kocadal O, Erener T, Ceritoglu K, Aksahin E, Aktekin CN. Acetabular components with or without screws in total hip arthroplasty. World J Orthop 2017; 8:705-709. [PMID: 28979854 PMCID: PMC5605356 DOI: 10.5312/wjo.v8.i9.705] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/09/2017] [Revised: 04/10/2017] [Accepted: 06/08/2017] [Indexed: 02/06/2023] Open
Abstract
AIM To compare the operation time, blood loss, and early outcomes of acetabular components with and without the screw.
METHODS Thirty patients who underwent cementless acetabular component with or without screw and whose follow-up exceeded one year period in total hip arthroplasty were evaluated. A posterior approach was used in all surgical procedures by one experienced surgeon. Demographic data, operation time, intra- and postoperative blood loss volume, follow-up clinical score, cup migration, and osteolysis were recorded. The Kolmogorov-Smirnov test was performed for testing the normality of study data. Mann-Whitney U test was used to analyze the inter-group differences. A P-value of ≤ 0.05 was considered statistically significant.
RESULTS Acetabular components were used in 16 (53.3%) patients with screw and 14 (46.7%) without screw. After one year of follow-up, an osteolytic lesion of 3 mm was found in only one patient in the screw group. No cup migration was encountered. Intra-group mean Harris hip score significantly increased, but there was no significant inter-group difference. While the mean operation time of the screw group was 121.8 min (range; 95-140), it was 102.7 min (range; 80-120) in the no-screw group, and this difference was statistically significant (P = 0.002). The mean intraoperative/postoperative, and total blood loss were 556.6 mL (range: 350-800)/423.3 mL (range: 250-600), and 983.3 mL (range: 600-1350), respectively in the screw group; and 527 mL (range: 400-700)/456 mL (range: 230-600), and 983 mL (range: 630-1250), respectively in the no-screw group. The blood loss difference between the two groups was not significant. In the screw group, the operation time was 19.1 min longer than the no-screw group, and this difference was statistically significant.
CONCLUSION Acetabular components with or without screw have similar results, but the use of screw increases the operation time significantly, while not changing the blood loss volume.
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Affiliation(s)
- Murad Pepe
- Department of Orthopedics and Traumatology, Ankara Training and Research Hospital, 06340 Ankara, Turkey
| | - Onur Kocadal
- Department of Orthopedics and Traumatology, Ankara Training and Research Hospital, 06340 Ankara, Turkey
| | - Tamer Erener
- Department of Orthopedics and Traumatology, Ankara Training and Research Hospital, 06340 Ankara, Turkey
| | - Kubilay Ceritoglu
- Department of Orthopedics and Traumatology, Ankara Training and Research Hospital, 06340 Ankara, Turkey
| | - Ertugrul Aksahin
- Orthopedics and Traumatology, MedicalPark Hospital, 06680 Ankara, Turkey
| | - Cem Nuri Aktekin
- Department of Orthopedics and Traumatology, Ankara Training and Research Hospital, 06340 Ankara, Turkey
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Hu Y, Jiang WZ, Huang ZF, Torsha TT, Yang DS, Xiao J. Perioperative Blood Loss During Total Hip Arthroplasty Among Patients With Ankylosing Spondylitis. Orthopedics 2017; 40:e904-e910. [PMID: 28877325 DOI: 10.3928/01477447-20170831-01] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/15/2017] [Accepted: 07/31/2017] [Indexed: 02/03/2023]
Abstract
Intraoperative blood loss is frequently an overarching concern during total hip arthroplasty (THA) for patients who have ankylosing spondylitis with hip involvement. However, the factors that affect blood loss have not been identified. The goal of this study was to investigate these factors among patients with ankylosing spondylitis. Patients in the authors' department who had ankylosing spondylitis and underwent unilateral THA from 2011 to 2016 were studied retrospectively. Demographic characteristics, perioperative laboratory values, intraoperative data, transfusion rate, transfusion volume, and data on hemostatic use were collected and analyzed statistically. Multiple and univariate linear regression analyses were performed. As a result, 44 patients were eligible for inclusion in the study. Mean age was 31.7±10.6 years, and mean disease duration was 9.7±5.8 years. Mean body mass index was 21.30±3.01 kg/m2. Mean volume of blood loss during THA was 1735.19±756.04 mL. Multiple linear regression analysis showed that perioperative blood loss was positively associated with Ankylosing Spondylitis Disease Activity Score (ASDAS), fibrinogen concentration, and surgical time. Further evaluation with univariate linear regression analysis suggested that ASDAS, red blood cell transfusion, and change of hematocrit concentration from preoperatively to postoperatively were correlated with blood loss. Disease activity, allogeneic blood transfusion volume, and change of hematocrit concentration from preoperatively to postoperatively appeared to be positively associated with perioperative blood loss during THA for patients with ankylosing spondylitis. For these patients, disease activity and the potential for allogeneic transfusion should be considered carefully before surgery. [Orthopedics. 2017; 40(5):e904-e910.].
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Li J, Qi K, Zhang Y, Xue C, Xu W. Epidural hematoma after total hip arthroplasty in ankylosing spondylitis patient: A case report and review of the literature. Medicine (Baltimore) 2017; 96:e6859. [PMID: 28489779 PMCID: PMC5428613 DOI: 10.1097/md.0000000000006859] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
Abstract
RATIONALE Ankylosing spondylitis (AS) can affect the hip joint, causing deformity and disability. Total hip arthroplasty can obviously relieve the pain of the hip joint, and reconstruct the function of hip joint. Epidural anesthesia in this patient population has high risk of epidural hematoma, but the reason is unclear. PATIENT CONCERNS A 44-year-old man diagnosed with AS underwent total hip arthroplasty. DIAGNOSES Six days after operation, he was diagnosed epidural hematoma. INTERVENTIONS Laminectomy and decompression surgery was performed. OUTCOMES At the last follow-up, he recovered the feeling and function of lower limbs. A literature review was undertaken to understand the incidence and risk factors. The incidence of spinal hematoma in this population is high and only probable risk factors are reported without further research. LESSONS Based on our review and the illustration of this case, AS patients have both lumbar and hip bony fusion. The exact bone canal caused by the lumbar puncture needle may play an important role in epidural hematoma. General anesthesia may be a better choice for this special patient cohort.
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MESH Headings
- Adult
- Anesthesia, Epidural/adverse effects
- Arthroplasty, Replacement, Hip/adverse effects
- Decompression, Surgical/adverse effects
- Hematoma, Epidural, Spinal/diagnostic imaging
- Hematoma, Epidural, Spinal/etiology
- Humans
- Laminectomy/adverse effects
- Male
- Spondylitis, Ankylosing/complications
- Spondylitis, Ankylosing/diagnostic imaging
- Spondylitis, Ankylosing/surgery
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