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Tang Z, Wu Q, Li P, Wei X. Bilateral intertrochanteric fractures in an elderly patient following high-energy trauma: a case report. BMC Musculoskelet Disord 2024; 25:310. [PMID: 38649923 PMCID: PMC11034103 DOI: 10.1186/s12891-024-07432-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/26/2023] [Accepted: 04/09/2024] [Indexed: 04/25/2024] Open
Abstract
BACKGROUND Cases of bilateral hip fractures are rare, and even more so are cases of bilateral intertrochanteric fractures. Common causes include trauma, internal diseases, and primary or secondary bone diseases. We report a case of bilateral intertrochanteric fractures in an elderly patient following a severe car accident, a scenario not extensively reported in existing literature. CASE PRESENTATION We report on an 84-year-old male who suffered severe trauma from a car accident, resulting in multiple injuries and shock state, with pain and limited mobility in both hip joints. After examination and imaging studies, the patient was diagnosed with multiple injuries and bilateral intertrochanteric fractures. Following emergency resuscitation, he was admitted to the orthopedic ward. A pre-surgical multidisciplinary team (MDT) consultation was convened to optimize surgical conditions. The patient underwent successful one-stage bilateral intramedullary nailing. The patient was assisted to stand with a walker on the third day after surgery. Six months post-surgery, the patient resumed outdoor activities. CONCLUSION Managing bilateral intertrochanteric fractures, particularly in the elderly with severe trauma, is notably challenging due to their rarity. However, a coordinated multidisciplinary approach and one-stage bilateral internal fixation can lead to effective treatment outcomes and favorable prognoses.
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Affiliation(s)
| | - Qingshu Wu
- Peking University Health Science Center, Beijing, China
| | - Pan Li
- Aerospace Center Hospital, Beijing, China
| | - Xing Wei
- Aerospace Center Hospital, Beijing, China.
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Xiang G, Dong X, Lin S, Cai L, Zhou F, Luo P, Zhu J. A nomogram for prediction of deep venous thrombosis risk in elderly femoral intertrochanteric fracture patients: A dual-center retrospective study. Front Surg 2023; 9:1028859. [PMID: 36684366 PMCID: PMC9852608 DOI: 10.3389/fsurg.2022.1028859] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2022] [Accepted: 11/25/2022] [Indexed: 01/07/2023] Open
Abstract
Objective Deep venous thrombosis (DVT) of the lower extremity is a common perioperative complication of femoral intertrochanteric fracture. This study aimed to identify the risk factors of lower extremity deep vein thrombosis (DVT) in elderly femoral intertrochanteric fracture patients and establish a nomogram model. Methods From August 2014 to June 2021, a total of 1,652 femoral intertrochanteric fracture patients over the age of 65 were enrolled in our study. We distinguished independent risk factors by univariate and multivariate Cox analyses. A nomogram model was then built, and the discriminative and calibration of the model was evaluated through receiver operating characteristics (ROC) and calibration plots. Results A total of 378 patients developed DVT (292 in the training group, 86 in the validation group) while the remaining patients did not. According to the univariate and multivariate Cox analyses results, age (OR = 1.07, 95% CI: 1.04-1.10), fibrinogen (OR = 2.09, 95% CI: 1.68-2.60), D-dimer (OR = 1.33, 95% CI: 1.27-1.40), time from injury to admission (OR = 1.78, 95% CI: 1.55-2.05), functional status (OR = 4.21, 95% CI: 2.86-6.20), and diabetes (OR = 1.65, 95% CI: 1.10-2.48) were identified as independent risk factors of DVT. The ROC values for DVT of the training and validation group were 0.862 and 0.912, and the P-value of the Hosmer-Lemeshow calibration test was 0.767. Conclusion This nomogram model can be used to predict the probability of preoperative DVT in elderly patients with femoral intertrochanteric fracture and guide physician in perioperative thrombosis management.
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Affiliation(s)
- Guangheng Xiang
- Department of Orthopaedic, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou, China
| | - Xiaoyu Dong
- School of Pharmaceutical Science, Wenzhou Medical University, Wenzhou, China
| | - Shenglei Lin
- Department of Orthopaedic, Wenzhou Central Hospital, Wenzhou, China
| | - Leyi Cai
- Department of Orthopaedic, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou, China
| | - Feiya Zhou
- Department of Orthopaedic, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou, China
| | - Peng Luo
- Department of Orthopaedic, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou, China
| | - Juanjuan Zhu
- Department of Geriatrics and Neurology, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou, China,Correspondence: Juanjuan Zhu
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Kobayashi T, Akiyama T, Mawatari M. Predictors of preoperative deep vein thrombosis in hip fractures: A systematic review and meta-analysis. J Orthop Sci 2023; 28:222-232. [PMID: 34593286 DOI: 10.1016/j.jos.2021.08.013] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/27/2021] [Revised: 08/25/2021] [Accepted: 08/27/2021] [Indexed: 01/10/2023]
Abstract
BACKGROUND The predictors of preoperative deep vein thrombosis (DVT) in patients with hip fractures remain unclear. Therefore, this study describes the results of a systematic review and meta-analysis of relevant peer-reviewed literature on this topic. METHODS We searched PubMed, Google Scholar, Cochrane Library, Web of Science, and MEDLINE for articles published in English on the predictors of preoperative DVT in hip fractures. We calculated pooled odds ratios (OR) or mean differences (MD) for the DVT groups as compared with the non-DVT groups for each variable, including gender, age, body mass index, injury side, current smoking status, time from injury to admission, time from injury to surgery, fracture type, hypertension, arrhythmia, coronary artery disease, diabetes, stroke, kidney disease, liver disease, lung disease, malignancy, rheumatoid arthritis, D-dimer, fibrinogen, activated partial thromboplastin time, prothrombin time, thrombin time, hemoglobin, albumin, total cholesterol, and triglycerides. RESULTS We included 9 studies involving 3,123 Asian patients with hip fractures (DVT, n = 570; non-DVT, n = 2,553). Being female (OR = 1.27; 95% confidence interval [CI] 1.04-1.56; p = 0.02), being of advanced age (MD = 1.63; 95% CI 0.80-2.47; p = 0.0001), having a longer time from injury to admission (MD = 0.80; 95% CI 0.48-1.12; p < 0.00001), having a longer time from injury to surgery (MD = 2.20; 95% CI 1.53-2.88; p < 0.00001), and the presence of kidney disease (OR = 1.76; 95% CI 1.04-2.96; p = 0.03) were correlated with a high risk of DVT. However, we found no significant differences between the two groups in the other predictors. CONCLUSIONS Evidence indicates that being female, being of advanced age, having a longer time from injury to admission, having a longer time from injury to surgery, and having kidney disease are significantly correlated with a high risk of preoperative DVT in Asian patients with hip fracture. Further investigations with patients of other ethnicities are required.
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Affiliation(s)
- Takaomi Kobayashi
- Department of Orthopaedic Surgery, Imari-Arita Kyoritsu Hospital, 860 Ninosekou Arita-Town Nishimatsuura-Gun, Saga 849-4141, Japan; Department of Orthopaedic Surgery, Faculty of Medicine, Saga University, 5-1-1 Nabeshima, Saga 849-8501, Japan.
| | - Takayuki Akiyama
- Department of Orthopaedic Surgery, Imari-Arita Kyoritsu Hospital, 860 Ninosekou Arita-Town Nishimatsuura-Gun, Saga 849-4141, Japan; Department of Orthopaedic Surgery, Faculty of Medicine, Saga University, 5-1-1 Nabeshima, Saga 849-8501, Japan
| | - Masaaki Mawatari
- Department of Orthopaedic Surgery, Faculty of Medicine, Saga University, 5-1-1 Nabeshima, Saga 849-8501, Japan
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Incidence and risk factors of preoperative deep vein thrombosis in patients with intertrochanteric fractures: a retrospective study. J Orthop Surg Res 2022; 17:375. [PMID: 35922845 PMCID: PMC9351110 DOI: 10.1186/s13018-022-03268-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/17/2021] [Accepted: 07/27/2022] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND The risk of perioperative complications remains high in patients with intertrochanteric fractures. Immobilization after injury may predispose these patients to deep vein thrombosis (DVT) while waiting for surgery. The aims of this study were to determine the incidence of preoperative DVT in patients with intertrochanteric fractures and identify independent risk factors. METHODS This retrospective study included patients with intertrochanteric fractures waiting for surgical interventions at our institution from June 2018 to December 2020. All patients received pharmacologic thromboprophylaxis after admission and ultrasound screening for DVT in both lower limbs before surgery. Demographic, clinical and laboratory data of these patients were collected to perform univariate analysis first. Subsequently, factors with a significant difference in univariate analysis were introduced into the multivariate logistic regression analysis to determine the independent risk factors for preoperative DVT. RESULTS A total of 266 patients were enrolled in this study. Seventy-one patients (26.7%) developed DVTs before surgery. The majority of DVTs were distal types (91.5%). There were 40 patients with DVTs only in the affected limb, 7 patients with DVTs only in the unaffected limb, and 24 patients with DVTs in both lower limbs. Advanced age, female, prolonged period from injury to admission, combined cranial trauma, shorter thrombin time, increased level of D-dimer and lower level of albumin proved to be the independent risk factors for preoperative DVT. CONCLUSIONS We observed a high incidence of preoperative DVT in patients with intertrochanteric fractures. Identification of patients at high risk may improve the prevention and treatment of preoperative DVT in this population.
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Wang X, Jiang Z, Li Y, Gao K, Gao Y, He X, Zhou H, Zheng W. Prevalence of preoperative Deep Venous Thrombosis (DVT) following elderly intertrochanteric fractures and development of a risk prediction model. BMC Musculoskelet Disord 2022; 23:417. [PMID: 35509097 PMCID: PMC9065244 DOI: 10.1186/s12891-022-05381-y] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/08/2021] [Accepted: 04/15/2022] [Indexed: 01/01/2023] Open
Abstract
Background This study aimed to investigate the prevalence of preoperative deep venous thrombosis (DVT) following intertrochanteric fractures in the elderly and identify the associated factors, based on which a risk prediction model was developed. Method This was a retrospective single-center study of elderly patients presenting with intertrochanteric fractures between our institution between January 2017 and December 2020. Patients' duplex ultrasound (DUS) or venography results were retrieved to evaluate whether they had a preoperative deep venous thrombosis (DVT) of bilateral extremities, whereby patients were dichotomized. Various variables of interest on demographics, comorbidities, injury and biomarkers were extracted and their relationship between DVT were investigated. Statistically significant variables tested in multivariate logistics regression analyses were used to develop a risk prediction model. Results There were 855 patients eligible to be included in this study, and 105 were found to have preoperative DVT, with a prevalence rate of 12.3%. Ten factors were tested as significantly different and 2 marginally significant between DVT and non-DVT groups in the univariate analyses, but only 6 demonstrated the independent effect on DVT occurrence, including history of a VTE event (OR, 4.43; 95%CI, 2.04 to 9.62), time from injury to DVT screening (OR, 1.19; 95%CI, 1.13 to 1.25), BMI (OR, 1.11; 95%CI, 1.04–1.18), peripheral vascular disease (OR, 2.66; 95%CI, 1.10 to 6.40), reduced albumin (2.35; 95%CI, 1.48 to 3.71) and D-Dimer > 1.0 mg/L(OR, 1.90; 95%CI, 1.13 to 3.20). The DVT risk model showed an AUC of 0.780 (95%CI, 0.731 to 0.829), with a sensitivity of 0.667 and a specificity of 0.777. Conclusion Despite without a so high prevalence rate of DVT in a general population with intertrochanteric fracture, particular attention should be paid to those involved in the associated risk factors above. The risk prediction model exhibited the improved specificity, but its validity required further studies to verify.
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Affiliation(s)
- Xiaofei Wang
- Department of Traditional Chinese Medicine Orthopaedics, the 3Rd Hospital of Shijiazhuang, NO.15 Tiyu South Street, Shijiazhuang, 050000, Hebei, People's Republic of China
| | - Zhen Jiang
- Department of Traditional Chinese Medicine Orthopaedics, the 3Rd Hospital of Shijiazhuang, NO.15 Tiyu South Street, Shijiazhuang, 050000, Hebei, People's Republic of China
| | - Yufu Li
- Department of Traditional Chinese Medicine Orthopaedics, the 3Rd Hospital of Shijiazhuang, NO.15 Tiyu South Street, Shijiazhuang, 050000, Hebei, People's Republic of China
| | - Kai Gao
- Department of Traditional Chinese Medicine Orthopaedics, the 3Rd Hospital of Shijiazhuang, NO.15 Tiyu South Street, Shijiazhuang, 050000, Hebei, People's Republic of China
| | - Yang Gao
- Department of Traditional Chinese Medicine Orthopaedics, the 3Rd Hospital of Shijiazhuang, NO.15 Tiyu South Street, Shijiazhuang, 050000, Hebei, People's Republic of China
| | - Xiaoli He
- Department of Traditional Chinese Medicine Orthopaedics, the 3Rd Hospital of Shijiazhuang, NO.15 Tiyu South Street, Shijiazhuang, 050000, Hebei, People's Republic of China
| | - Hongyan Zhou
- Department of Nursing, the 3Rd Hospital of Shijiazhuang, Shijiazhuang, 050000, Hebei, People's Republic of China
| | - Wei Zheng
- Department of Traditional Chinese Medicine Orthopaedics, the 3Rd Hospital of Shijiazhuang, NO.15 Tiyu South Street, Shijiazhuang, 050000, Hebei, People's Republic of China.
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Incidence and risk factors of preoperative deep venous thrombosis following hip fracture: a retrospective analysis of 293 consecutive patients. Eur J Trauma Emerg Surg 2022; 48:3141-3147. [DOI: 10.1007/s00068-021-01861-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2021] [Accepted: 12/12/2021] [Indexed: 12/27/2022]
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Cong Y, Huang H, Zhang BF, Deng H, Lei J, Ke C, Han S, Zhang K, Wang P. The Correlation Between Preoperative Lower Extremity Deep Vein Thrombosis (DVT) and the Time from Injury to Surgery (TFITS). Clin Appl Thromb Hemost 2022; 28:10760296221108961. [PMID: 35850538 PMCID: PMC9309766 DOI: 10.1177/10760296221108961] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
Objective To investigate the correlation between preoperative DVT and the time from
injury to surgery (TFITS), and provide a clinical reference for the
prevention of preoperative DVT. Patients and methods We collected the clinical data of patients with lower extremities fractures
between September 1, 2014, and May 31, 2019. Doppler ultrasonography was
used to diagnose DVT. Patients were divided into the 0-2d group, 3-4d group,
5-7d group, and >7d group according to TFITS. The correlation between
TFITS and preoperative DVT was assessed using logistic regression according
to the adjusted model. Result A total of 2831 patients were included in the study. The mean(+/-SD) TFITS
was 6.11 ± 3.76 (0 to 21 d). A total of 821 (29.0%) cases had preoperative
DVT, with the incidence of DVT being 8.0% in the 0-2d group, 23.8% in the
3-4d group, 32.0% in the 5-7d group, and 36.2% in the >7d group, with
statistically significant differences(P<0.05) among all the groups. The
incidence of preoperative DVT increased with prolonged preoperative time. In
the fully adjusted model, TFITS was positively correlated with the incidence
of preoperative DVT (OR: 1.093; 95% CI: 1.068-1.118; P = 0.000), and the
strength of the association increased with increasing time. Conclusion TFITS was an independent risk factor on the incidence of preoperative DVT.
After excluding the effect of other factors, each 1d increases in TFITS was
correlated with a 9.3% increase in the risk of preoperative DVT. The TFITS
should be decreased to reduce the risk of preoperative DVT.
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Affiliation(s)
- Yuxuan Cong
- Department of Orthopedic Trauma, Honghui Hospital, 12480Xi'an Jiaotong University, No. 555 Youyi East Road, Xi'an, Shaanxi Province, 710054, People's Republic of China
| | - Hai Huang
- Department of Orthopedic Trauma, Honghui Hospital, 12480Xi'an Jiaotong University, No. 555 Youyi East Road, Xi'an, Shaanxi Province, 710054, People's Republic of China
| | - Bin-Fei Zhang
- Department of Orthopedic Trauma, Honghui Hospital, 12480Xi'an Jiaotong University, No. 555 Youyi East Road, Xi'an, Shaanxi Province, 710054, People's Republic of China
| | - Hongli Deng
- Department of Orthopedic Trauma, Honghui Hospital, 12480Xi'an Jiaotong University, No. 555 Youyi East Road, Xi'an, Shaanxi Province, 710054, People's Republic of China
| | - Jinlai Lei
- Department of Orthopedic Trauma, Honghui Hospital, 12480Xi'an Jiaotong University, No. 555 Youyi East Road, Xi'an, Shaanxi Province, 710054, People's Republic of China
| | - Chao Ke
- Department of Orthopedic Trauma, Honghui Hospital, 12480Xi'an Jiaotong University, No. 555 Youyi East Road, Xi'an, Shaanxi Province, 710054, People's Republic of China
| | - Shuang Han
- Department of Orthopedic Trauma, Honghui Hospital, 12480Xi'an Jiaotong University, No. 555 Youyi East Road, Xi'an, Shaanxi Province, 710054, People's Republic of China
| | - Kun Zhang
- Department of Orthopedic Trauma, Honghui Hospital, 12480Xi'an Jiaotong University, No. 555 Youyi East Road, Xi'an, Shaanxi Province, 710054, People's Republic of China
| | - Pengfei Wang
- Department of Orthopedic Trauma, Honghui Hospital, 12480Xi'an Jiaotong University, No. 555 Youyi East Road, Xi'an, Shaanxi Province, 710054, People's Republic of China
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Zhao K, Wang Z, Tian S, Hou Z, Chen W, Zhang Y. Incidence of and risk factors for pre-operative deep venous thrombosis in geriatric intertrochanteric fracture patients. INTERNATIONAL ORTHOPAEDICS 2021; 46:351-359. [PMID: 34661699 DOI: 10.1007/s00264-021-05215-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/10/2021] [Accepted: 09/08/2021] [Indexed: 10/20/2022]
Abstract
PURPOSE The purpose of this prospective study was to investigate the pre-operative incidence of and risk factors for deep venous thrombosis (DVT) in geriatric intertrochanteric fractures to help facilitate the peri-operative management of them. MATERIALS AND METHODS Data of 1515 geriatric intertrochanteric fracture patients were extracted from a prospective intertrochanteric fractures database according to the inclusion criteria and exclusion criteria. The demographics, fracture characteristics, and pre-operative laboratory indicators of patients were evaluated statistically. RESULTS The incidence of pre-operative DVT was 10.2% (155 in 1360 patients) in the present study. The rates of proximal DVT, distal DVT, and mixed DVT were 18.1% (28 patients), 56.8% (88 patients), and 25.2% (39 patients), respectively. The percentages of DVT developing in the affected limb, uninjured limb, and bilateral limbs were 74.2% (115 in 55 patients), 16.8% (26 in 155 patients), and 9% (14 in 155 patients), respectively. After the multivariable analysis, the time from injury to surgery (TIS) > 4 days [odds ratio (OR) = 1.870, p = 0.001], the number of comorbidities > 2 (OR = 2.124, p = 0.014), and albumin (ALB) < 35 g/L (OR = 1.516, p = 0.043), etc. were significantly associated with the development of preoperative DVT in geriatric intertrochanteric fracture patients. CONCLUSIONS Although routine anticoagulant therapy was used to prevent the formation of DVT, the incidence of which was still high. Therefore, pre-operative ultrasound of both lower extremities was advised for pre-operatively, especially for patients with delayed surgery, hypoproteinemia, three or more comorbidities, and a D-dimer level > 1.59 mg/L.
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Affiliation(s)
- Kuo Zhao
- Department of Orthopaedic Surgery, Third Hospital of Hebei Medical University, No. 139 Ziqiang Road, Shijiazhuang, Hebei, People's Republic of China.,Key Laboratory of Biomechanics of Hebei Province, Shijiazhuang, 050051, Hebei, People's Republic of China.,Orthopaedic Research Institution of Hebei Province, Shijiazhuang, 050051, Hebei, People's Republic of China
| | - Zhongzheng Wang
- Department of Orthopaedic Surgery, Third Hospital of Hebei Medical University, No. 139 Ziqiang Road, Shijiazhuang, Hebei, People's Republic of China.,Key Laboratory of Biomechanics of Hebei Province, Shijiazhuang, 050051, Hebei, People's Republic of China.,Orthopaedic Research Institution of Hebei Province, Shijiazhuang, 050051, Hebei, People's Republic of China
| | - Siyu Tian
- Department of Orthopaedic Surgery, Third Hospital of Hebei Medical University, No. 139 Ziqiang Road, Shijiazhuang, Hebei, People's Republic of China.,Key Laboratory of Biomechanics of Hebei Province, Shijiazhuang, 050051, Hebei, People's Republic of China.,Orthopaedic Research Institution of Hebei Province, Shijiazhuang, 050051, Hebei, People's Republic of China
| | - Zhiyong Hou
- Department of Orthopaedic Surgery, Third Hospital of Hebei Medical University, No. 139 Ziqiang Road, Shijiazhuang, Hebei, People's Republic of China. .,Key Laboratory of Biomechanics of Hebei Province, Shijiazhuang, 050051, Hebei, People's Republic of China. .,Orthopaedic Research Institution of Hebei Province, Shijiazhuang, 050051, Hebei, People's Republic of China. .,NHC Key Laboratory of Intelligent Orthopaedic Equipment, The Third Hospital of Hebei Medical University, Hebei, People's Republic of China.
| | - Wei Chen
- Department of Orthopaedic Surgery, Third Hospital of Hebei Medical University, No. 139 Ziqiang Road, Shijiazhuang, Hebei, People's Republic of China.,Key Laboratory of Biomechanics of Hebei Province, Shijiazhuang, 050051, Hebei, People's Republic of China.,Orthopaedic Research Institution of Hebei Province, Shijiazhuang, 050051, Hebei, People's Republic of China
| | - Yingze Zhang
- Department of Orthopaedic Surgery, Third Hospital of Hebei Medical University, No. 139 Ziqiang Road, Shijiazhuang, Hebei, People's Republic of China.,Key Laboratory of Biomechanics of Hebei Province, Shijiazhuang, 050051, Hebei, People's Republic of China.,Orthopaedic Research Institution of Hebei Province, Shijiazhuang, 050051, Hebei, People's Republic of China.,NHC Key Laboratory of Intelligent Orthopaedic Equipment, The Third Hospital of Hebei Medical University, Hebei, People's Republic of China.,Chinese Academy of Engineering, Beijing, 10088, People's Republic of China
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