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Lee S, Yoo JI, Kang YJ. Integrative analyses of genes related to femoral head osteonecrosis: an umbrella review of systematic reviews and meta-analyses of observational studies. J Orthop Surg Res 2022; 17:182. [PMID: 35346283 PMCID: PMC8961967 DOI: 10.1186/s13018-022-03079-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/23/2021] [Accepted: 03/16/2022] [Indexed: 11/10/2022] Open
Abstract
Abstract
Background
Femoral head osteonecrosis (FHON) is a worldwide challenging clinical topic. Steroid use is one of the main etiologies of FHON. There are several genetic variants associated with FHON. Therefore, the purpose of this umbrella review was to provide a comprehensive summary of a meta-analysis and systematic review of genetic variations associated with nonsteroidal and steroid-induced FHON.
Methods
The eligible studies were selected from the PubMed and MEDLINE databases for the collection of diverse systematic meta-analyses and reviews. The genetic main effect score was assigned using the Human Genome Epidemiology Network’s Venice criteria to assess the cumulative evidence on the effects of a single nucleotide polymorphism (SNP) on FHON.
Results
Eight articles reported the meta-analysis of candidate SNP-based studies covering eight genes and 13 genetic variants. In the nonsteroid-induced FHON genetic variants including rs2012390 and rs11225394 in MMP8, rs1800629 and rs361525 in tumor necrosis factor (TNF)-α, VNTR in intron 4, rs1799983 and rs2070744 in endothelial nitric oxide synthase (eNOS), rs2010963 in vascular endothelial growth factor (VEGF), and rs6025 in factor V showed significance in each reference. The steroid-induced FHON genetic variants including rs693 and rs1042031 in apolipoprotein (Apo)B, rs1045642 in ABCB1, and rs1799889 in PAI-1 showed significance in each reference.
Conclusion
Based on the systematic review conducted in this study, we organized the genomes associated with FHON and looked at each contribution. Our results could give an integrative approach for understanding the mechanism of FHON etiology. It is expected that these results could contribute to the strategy of prediagnosis, evaluating the individual risk of nonsteroid-induced and steroid-induced FHON.
Level of Evidence: Level I.
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Wang R, Li R, Liu R. An intron SNP rs2069837 in IL-6 is associated with osteonecrosis of the femoral head development. BMC Med Genomics 2022; 15:5. [PMID: 34986839 PMCID: PMC8734317 DOI: 10.1186/s12920-021-01142-3] [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] [Received: 08/13/2021] [Accepted: 11/26/2021] [Indexed: 11/10/2022] Open
Abstract
Background Genetic polymorphisms play a crucial role in the development of osteonecrosis of the femoral head (ONFH). This study mainly explored the association of IL-6 variants and ONFH susceptibility among the Chinese Han population. Methods Two variants (rs2069837, and rs13306435) in the IL-6 gene were identified and genotyped from 566 patients with ONFH and 566 healthy controls. The associations between IL-6 polymorphisms and ONFH susceptibility were assessed using odds ratio (OR) and 95% confidence interval (95% CI) via logistic regression. The potential function of these two variants was predicted by the HaploReg online database. Results The results of the overall analysis revealed that IL-6 rs2069837 was correlated with decreased risk of ONFH among the Chinese Han population (p < 0.05). In stratified analysis, rs2069837 also reduced the susceptibility to ONFH in older people (> 51 years), males, nonsmokers, and nondrinkers (p < 0.05). However, no associations between rs13306435 and ONFH susceptibility were observed (p > 0.05). Conclusions To sum up, we suggested that rs2069837 G>A polymorphism in the IL-6 gene was significantly associated with a decreased risk of ONFH among the Chinese Hans. These findings underscored the crucial role of IL-6 rs2069837 in the occurrence of ONFH. Supplementary Information The online version contains supplementary material available at 10.1186/s12920-021-01142-3.
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Affiliation(s)
- Ruisong Wang
- Department of Orthopedics, the Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, 710004, China.,Department of orthopedics, Xi'an Fifth Hospital, Xi'an, 710082, China
| | - Rui Li
- Department of rheumatology, Xi'an Fifth Hospital, Xi'an, 710082, China
| | - Ruiyu Liu
- Department of Orthopedics, the Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, 710004, China.
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Lin T, Yang P, Cai K, Li Z, Pang F, Zhang Q, He W, Wei Q. [Predictive effect of femoral neck strength composite indexes on femoral head collapse in non-traumatic osteonecrosis of femoral head]. ZHONGGUO XIU FU CHONG JIAN WAI KE ZA ZHI = ZHONGGUO XIUFU CHONGJIAN WAIKE ZAZHI = CHINESE JOURNAL OF REPARATIVE AND RECONSTRUCTIVE SURGERY 2021; 35:967-972. [PMID: 34387423 DOI: 10.7507/1002-1892.202103168] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Objective To explore the predictive effect of the femoral neck strength composite indexes on femoral head collapse in non-traumatic osteonecrosis of the femoral head (ONFH) compared with bone turnover marker. Methods The non-traumatic ONFH patients who were admitted and received non-surgical treatment between January 2010 and December 2016 as the research object. And 96 cases (139 hips) met the selection criteria and were included in the study. There were 54 males (79 hips) and 42 females (60 hips), with an average age of 40.2 years (range, 22-60 years). According to whether the femoral head collapsed during follow-up, the patients were divided into collapsed group and non-collapsed group. The femoral neck width, hip axis length, height, body weight, and bone mineral density of femoral neck were measured. The femoral neck strength composite indexes, including the compressive strength index (CSI), bending strength index (BSI), and impact strength index (ISI), were calculated. The bone turnover marker, including the total typeⅠcollagen amino terminal elongation peptide (t-P1NP), β-crosslaps (β-CTx), alkaline phosphatase (ALP), 25 hydroxyvitamin D [25(OH)D], and N-terminal osteocalcin (N-MID), were measured. The age, gender, height, body weight, body mass index (BMI), bone mineral density of femoral neck, etiology, Japanese Osteonecrosis Investigation Committee (JIC) classification, femoral neck strength composite indexes, and bone turnover marker were compared between the two groups, and the influencing factors of the occurrence of femoral head collapse were initially screened. Then the significant variables in the femoral neck strength composite indexes and bone turnover marker were used for logistic regression analysis to screen risk factors; and the receiver operating characteristic (ROC) curve was used to determine the significant variables' impact on non-traumatic ONFH. Results All patients were followed up 3.2 years on average (range, 2-4 years). During follow-up, 46 cases (64 hips) had femoral head collapse (collapsed group), and the remaining 50 cases (75 hips) did not experience femoral head collapse (non-collapsed group). Univariate analysis showed that the difference in JIC classification between the two groups was significant ( Z=-7.090, P=0.000); however, the differences in age, gender, height, body weight, BMI, bone mineral density of femoral neck, and etiology were not significant ( P>0.05). In the femoral neck strength composite indexes, the CSI, BSI, and ISI of the collapsed group were significantly lower than those of the non-collapsed group ( P<0.05); in the bone turnover marker, the t-P1NP and β-CTx of the collapsed group were significantly lower than those of the non-collapsed group ( P<0.05); there was no significant difference in N-MID, 25(OH)D or ALP between groups ( P>0.05). Multivariate analysis showed that the CSI, ISI, and t-P1NP were risk factors for femoral collapse in patients with non-traumatic ONFH ( P<0.05). ROC curve analysis showed that the cut-off points of CSI, BSI, ISI, t-P1NP, and β-CTx were 6.172, 2.435, 0.465, 57.193, and 0.503, respectively, and the area under the ROC curve (AUC) were 0.753, 0.642, 0.903, 0.626, and 0.599, respectively. Conclusion The femoral neck strength composite indexes can predict the femoral head collapse in non-traumatic ONFH better than the bone turnover marker. ISI of 0.465 is a potential cut-off point below which future collapse of early non-traumatic ONFH can be predicted.
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Affiliation(s)
- Tianye Lin
- The First Clinical Medical College of Guangzhou University of Traditional Chinese Medicine, Guangzhou Guangdong, 510080, P.R.China.,Guangdong Research Institute of Orthopedics and Traumatology of Chinese Medicine, Guangzhou Guangdong, 510405, P.R.China
| | - Peng Yang
- The First Clinical Medical College of Guangzhou University of Traditional Chinese Medicine, Guangzhou Guangdong, 510080, P.R.China.,Guangdong Research Institute of Orthopedics and Traumatology of Chinese Medicine, Guangzhou Guangdong, 510405, P.R.China
| | - Kaishen Cai
- The First Clinical Medical College of Guangzhou University of Traditional Chinese Medicine, Guangzhou Guangdong, 510080, P.R.China.,Guangdong Research Institute of Orthopedics and Traumatology of Chinese Medicine, Guangzhou Guangdong, 510405, P.R.China
| | - Ziqi Li
- Guangdong Research Institute of Orthopedics and Traumatology of Chinese Medicine, Guangzhou Guangdong, 510405, P.R.China.,The Third Affiliated Hospital of Guangzhou University of Traditional Chinese Medicine, Guangzhou Guangdong, 510405, P.R.China
| | - Fengxiang Pang
- The First Clinical Medical College of Guangzhou University of Traditional Chinese Medicine, Guangzhou Guangdong, 510080, P.R.China.,Guangdong Research Institute of Orthopedics and Traumatology of Chinese Medicine, Guangzhou Guangdong, 510405, P.R.China
| | - Qingwen Zhang
- Guangdong Research Institute of Orthopedics and Traumatology of Chinese Medicine, Guangzhou Guangdong, 510405, P.R.China.,The Third Affiliated Hospital of Guangzhou University of Traditional Chinese Medicine, Guangzhou Guangdong, 510405, P.R.China
| | - Wei He
- Guangdong Research Institute of Orthopedics and Traumatology of Chinese Medicine, Guangzhou Guangdong, 510405, P.R.China.,The Third Affiliated Hospital of Guangzhou University of Traditional Chinese Medicine, Guangzhou Guangdong, 510405, P.R.China
| | - Qiushi Wei
- Guangdong Research Institute of Orthopedics and Traumatology of Chinese Medicine, Guangzhou Guangdong, 510405, P.R.China.,The Third Affiliated Hospital of Guangzhou University of Traditional Chinese Medicine, Guangzhou Guangdong, 510405, P.R.China
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Trent S, Sicat CS, Slover J. Femoral Head Osteonecrosis in Systemic Lupus Erythematosus: Total Hip Arthroplasty Outcomes and Considerations. JBJS Rev 2021; 9:01874474-202104000-00002. [PMID: 33819202 DOI: 10.2106/jbjs.rvw.20.00142] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Abstract
» Osteonecrosis of the femoral head disproportionately affects patients with systemic lupus erythematosus (SLE) and is the most frequent indication for total hip arthroplasty (THA) in these patients. » Patients with SLE are more likely to undergo THA than those without the disease, and they elect for the procedure at a younger age. More arthroplasty procedures are currently being performed on patients with SLE as the all-cause rate of arthroplasty is increasing similarly to that of the general population. » Postoperatively, patients with SLE report similar functional outcomes but lower physical quality of life compared with their peers. Sociodemographic factors should be considered as barriers to recovery and should be taken into account during patient counseling. » Past research regarding the postoperative infection risk following THA in patients with SLE has been unclear. Recent high-power data indicate that these patients have a higher risk of periprosthetic infection for unclear reasons. » SLE is an independent risk factor for perioperative medical complications, including the need for blood transfusion, genitourinary complications, sepsis, acute renal disease, deep venous thrombosis, and falls, among other adverse events. The current perioperative treatment guidelines were founded on low-to-moderate-quality studies.
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Affiliation(s)
- Sarah Trent
- Georgetown University School of Medicine, Washington, DC
| | - Chelsea Sue Sicat
- Department of Orthopedic Surgery, New York University Langone Orthopedic Hospital, New York, NY
| | - James Slover
- Department of Orthopedic Surgery, New York University Langone Orthopedic Hospital, New York, NY
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Mont MA, Salem HS, Piuzzi NS, Goodman SB, Jones LC. Nontraumatic Osteonecrosis of the Femoral Head: Where Do We Stand Today?: A 5-Year Update. J Bone Joint Surg Am 2020; 102:1084-1099. [PMID: 32282421 PMCID: PMC7508290 DOI: 10.2106/jbjs.19.01271] [Citation(s) in RCA: 155] [Impact Index Per Article: 38.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
➢. Clinicians should exercise a high level of suspicion in at-risk patients (those who use corticosteroids, consume excessive alcohol, have sickle cell disease, etc.) in order to diagnose osteonecrosis of the femoral head in its earliest stage. ➢. Nonoperative treatment modalities have generally been ineffective at halting progression. Thus, nonoperative treatment is not appropriate in early stages when one is attempting to preserve the native joint, except potentially on rare occasions for small-sized, medially located lesions, which may heal without surgery. ➢. Joint-preserving procedures should be attempted in early-stage lesions to save the femoral head. ➢. Cell-based augmentation of joint-preserving procedures continues to show promising results, and thus should be considered as an ancillary treatment method that may improve clinical outcomes. ➢. The outcomes of total hip arthroplasty in the setting of osteonecrosis are excellent, with results similar to those in patients who have an underlying diagnosis of osteoarthritis.
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Affiliation(s)
- Michael A. Mont
- Lenox Hill Hospital, New York, NY,Cleveland Clinic, Cleveland, Ohio,Email address for M.A. Mont:
| | | | | | | | - Lynne C. Jones
- Johns Hopkins University School of Medicine, Baltimore, Maryland
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Wang T, Azeddine B, Mah W, Harvey EJ, Rosenblatt D, Séguin C. Osteonecrosis of the femoral head: genetic basis. INTERNATIONAL ORTHOPAEDICS 2018; 43:519-530. [PMID: 30328481 DOI: 10.1007/s00264-018-4172-8] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/07/2018] [Accepted: 09/18/2018] [Indexed: 12/19/2022]
Abstract
PURPOSE Genetic factors and hereditary forms of osteonecrosis of the femoral head (ONFH) have been elucidated through genetic association studies. The significance of these cases is that they suggest an alternative hypothesis to the development of the disease. This review presents a summary of single nucleotide polymorphisms (SNPs) and other genetic mutation variations found in association with ONFH, including our recent identification of a novel mutation in the transient receptor potential vanilloid 4 (TRPV4) gene in association with inherited ONFH. The purpose of this review is to consolidate and categorize genetic linkages according to physiological pathways. METHODS A systematic review of literature from PubMed and Google Scholar was undertaken with a focus on genetic linkages and hereditary case studies of the disease. Recent genetic analysis studies published after 2007 were the focus of genetic linkages in non-hereditary cases. RESULTS The summary of these genetic findings identifies biological processes believed to be involved in the development of ONFH, which include circulation, steroid metabolism, immunity, and the regulation of bone formation. CONCLUSION Taken together, these associations may lead to new pathways of bone repair and remodeling while opening new avenues for therapeutic targets. Knowledge of genetic variations could help identify individuals considered to be at higher risk of developing ONFH and prevent the multiple hit effect.
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Affiliation(s)
- Tracy Wang
- Vascular Biology Research lab, Research Institute (RI) McGill University Health Centre, C9 Montreal General Hospital, 1650 Cedar Avenue, Montreal, QC, H3G 1A4, Canada.
| | - Bouziane Azeddine
- Vascular Biology Research lab, Research Institute (RI) McGill University Health Centre, C9 Montreal General Hospital, 1650 Cedar Avenue, Montreal, QC, H3G 1A4, Canada
| | - Wayne Mah
- Vascular Biology Research lab, Research Institute (RI) McGill University Health Centre, C9 Montreal General Hospital, 1650 Cedar Avenue, Montreal, QC, H3G 1A4, Canada
| | - Edward J Harvey
- Department Surgery, Division Orthopaedic Surgery, McGill University Health Centre, B5 Montreal General Hospital, 1650 Cedar Avenue, Montreal, QC, H3G 1A4, Canada
| | - David Rosenblatt
- Department of Human Genetics, McGill University, Montreal, Quebec, Canada
| | - Chantal Séguin
- Vascular Biology Research lab, Research Institute (RI) McGill University Health Centre, C9 Montreal General Hospital, 1650 Cedar Avenue, Montreal, QC, H3G 1A4, Canada. .,Department of Medicine, Division of Hematology and Oncology, McGill University Health Centre, Montreal, Quebec, H4A 3J1, Canada. .,Glen Site, Cedars Cancer Centre, McGill University Health Centre, 1001 Décarie Blvd., room D02.7519, Montreal, Quebec, H4A 3J1, Canada.
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Azarpira MR, Ghilian MM, Sobhan MR, Mehdinezhad-Yazdi M, Aghili K, Miresmaeili SM, Neamatzadeh H. Association of MTHFR and TNF-α genes polymorphisms with susceptibility to Legg-Calve-Perthes disease in Iranian children: A case-control study. J Orthop 2018; 15:984-987. [PMID: 30224855 DOI: 10.1016/j.jor.2018.08.042] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/02/2018] [Accepted: 08/25/2018] [Indexed: 12/11/2022] Open
Abstract
Objective The aim of this study was to assess the association of MTHFR and TNF-α genes polymorphisms with Legg-Calvé-Perthes' disease (LCPD) risk in the Iranian children. Methods A total of 45 children with LCPD and 55 healthy controls were recruited to the study. Genotyping was performed via the RFLP-PCR method and genetic risk was calculated by odds ratio (OR) with its corresponding 95% confidence interval (CI). Results & conclusion Our case-control study failed to determine any association of MTHFR (677C > T and 1298A > C) and TNF-α (-308G > A and -238G > A) polymorphisms with LCPD risk. More studies with larger sample size are warranted to validate our findings.
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Affiliation(s)
- Mohammad Reza Azarpira
- Bone and Joint Diseases Research Center, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Mohammad Mahdi Ghilian
- Bone and Joint Diseases Research Center, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Mohammad Reza Sobhan
- Department of Orthopedics, Shahid Sadoughi University of Medical Sciences, Yazd, Iran
| | | | - Kazem Aghili
- Department of Radiology, Shahid Sadoughi University of Medical Sciences, Yazd, Iran
| | | | - Hossein Neamatzadeh
- Department of Medical Genetics, Shahid Sadoughi University of Medical Sciences, Yazd, Iran
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Hip osteonecrosis: stem cells for life or behead and arthroplasty? INTERNATIONAL ORTHOPAEDICS 2018; 42:1425-1428. [PMID: 29934715 DOI: 10.1007/s00264-018-4026-4] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/03/2018] [Accepted: 06/04/2018] [Indexed: 12/15/2022]
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Hernigou P, Dubory A, Homma Y, Guissou I, Flouzat Lachaniette CH, Chevallier N, Rouard H. Cell therapy versus simultaneous contralateral decompression in symptomatic corticosteroid osteonecrosis: a thirty year follow-up prospective randomized study of one hundred and twenty five adult patients. INTERNATIONAL ORTHOPAEDICS 2018; 42:1639-1649. [PMID: 29744647 DOI: 10.1007/s00264-018-3941-8] [Citation(s) in RCA: 65] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/28/2018] [Accepted: 04/05/2018] [Indexed: 11/25/2022]
Abstract
PURPOSE Symptomatic osteonecrosis related to corticosteroids has a high risk of progression to collapse in absence of treatment. The purposes of this study were to evaluate the results of autologous bone marrow grafting of the symptomatic hip in adult patients with osteonecrosis and to compare the results with core decompression alone in the contralateral symptomatic hip. MATERIALS AND METHODS A total of 125 consecutive patients (78 males and 47 females) with bilateral osteonecrosis (ON) and who had both hips symptomatic and at the same stage on each side (stage I or II) were included in this study from 1988 to 1998. The volume of osteonecrosis was measured with MRI in both hips; the smaller size ON was treated with core decompression, and the contralateral hip with the larger ON was treated with percutaneous mesenchymal cell (MSC) injection obtained from bone marrow concentration. The average total number of MSCs (counted as number of colony forming units-fibroblast) injected in each hip was 90,000 ± 25,000 cells (range 45,000 to 180,000 cells). RESULTS At the most recent FU (average 25 years after the first surgery, range 20 to 30 years), among the 250 hips included in the study, 35 hips (28%) had collapsed at the most recent follow-up after bone marrow grafting, and 90 (72%) after core decompression (CD). Ninety-five hips (76%) in the CD group underwent total hip replacement and 30 hips (24%) in the bone marrow graft group (p < 0.0001). Hips undergoing only CD were approximately three times more likely to undergo a primary THA (odds ratio: 10.0278; 95% CI: 5.6117 to 17.9190; p < 0.0001) as compared with hips undergoing an initial bone marrow grafting. For the 90 hips treated with bone marrow injection and without collapse, the mean volume of repair evaluated by MRI at the most recent follow-up was 16.4 cm3 (range 12 to 21 cm3) corresponding to a decrease of the pre-operative average volume from 22.4 cm3 (range 35-15 cm3) to 6 cm3 (range 12-0 cm3); as percentage of the volume of the femoral head, the decrease moved from 44.8 to 12%. CONCLUSION Core decompression with bone marrow injection improved the outcome of the disease as compared with core decompression alone in the same patient.
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Hernigou P, Thiebaut B, Housset V, Bastard C, Homma Y, Chaib Y, Flouzat Lachaniette CH. Stem cell therapy in bilateral osteonecrosis: computer-assisted surgery versus conventional fluoroscopic technique on the contralateral side. INTERNATIONAL ORTHOPAEDICS 2018; 42:1593-1598. [PMID: 29696307 DOI: 10.1007/s00264-018-3953-4] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/11/2018] [Accepted: 04/16/2018] [Indexed: 12/18/2022]
Abstract
PURPOSE Surgical management of osteonecrosis with core decompression with stem cell therapy is a new procedure. The technique is performed with fluoroscopic guidance. This study attempts to determine if computer-navigated technique can improve the procedure. METHODS Thirty consecutive patients with bilateral symptomatic osteonecrosis without collapse were included in this study during the year 2011. A prospective, randomized, and controlled study was conducted on 60 hips (bilateral osteonecrosis) using conventional fluoroscopy technique on one side and computer-based navigation on the contralateral side. Bone marrow aspirated from the two iliac crests was mixed before concentration. Each side received the same volume of concentrated bone marrow and the same number of cells 110,000 ± 27,000 cells (counted as CFU-F). RESULTS Computer navigation achieved better parallelism to the ideal position of the trocar, with better trocar placement as regards to tip-to-subchondral distance and ideal centre position within the osteonecrosis for injection of stem cells. Using computer navigation took fewer attempts to position the trocar, used less fluoroscopy time, and decreased the radiation exposure as compared with surgery performed with conventional fluoroscopy. At the most recent follow-up (6 years), increasing the precision with computer navigation resulted in less collapse (7 versus 1) and better volume of repair (13.4 versus 8.2 cm3) for hips treated with the computer-assisted technique. CONCLUSIONS The findings of this study suggest that computer navigation may be safely used in a basic procedure for injection of stem cells.
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