Surgical Treatment of Osteonecrosis of the Femoral Head Using Minimally Invasive Surgical Drilling and Cancellous Grafting at Brazzaville University Hospital

Introduction: Osteonecrosis of the femoral head (ONTF) is a debilitating condition. Several treatments have been proposed with controversial results. The aim of our study was to evaluate treatment by surgical drilling coupled with in situ cancellous grafting. Materials and methods: Our study was a case-control study conducted at Brazzaville University Hospital from 1st January 2018 to 31 December 2023. It compared two groups of patients with ONTF: non-operated (13 patients, 20 hips) and operated (22 patients, 35 hips). We used the visual digital scale (VDS) for pain assessment, the Merle D’Aubigne-Postel (MDP) scoring system for clinical and functional assessment, and the evolution of necrosis. Results: The group of non-operated patients had a mean age of 35.69 ± 3.4 years, no improvement in pain with an EVN above seven at the last recoil and a mean global MDP score falling from 12.7 before offloading to 10.13 at one year. The group of patients operated on had a mean age of 37.86 ± 7.02 years, a significant reduction in pain (p = 0.00004) and a significantly increased MDP score (p = 0.0034). A comparison of the two groups of patients showed significant stabilization of the necrotic lesions in the operated patients (p = 0.00067), with better satisfaction in the same group. Conclusion: Surgical drilling combined with grafting in the treatment of early-stage ONTF has improved progress in our series. The technique is reproducible and less invasive. It has made it possible to delay unfavorable progression and, consequently, hip replacement surgery.

Bone palsy eliminates granules to regulate Wnt/PI3K-AKT signaling pathway and intervene in hormonal osteonecrosis of the femoral head in rabbits

Objective:To investigate the therapeutic effect of osteopathic osteopathy on hormonal osteonecrosis in rabbits by regulating the Wnt/PI3K-AKT signaling pathway.Methods:Thirty clean-grade New Zealand rabbits were randomly divided into control group,model group and experimental group,and all except for the control group,allogeneic serum combined with glucocorticoids were used to establish animal models of simulated hormonal osteonecrosis of the femoral head.After successful modeling,the experimental group was given the model group and the control group the same amount of normal saline,and the experimental group was given bone palsy granule concentrate according to the equivalent dose of humans and rabbits,once a day for 8 weeks,and after intraperitoneal anesthesia,blood was collected from the extracorporeal heart and the serum ALP and TGF-β1 levels were detected by immunoenzyme-linked adsorption.The experimental animals were sacrificed,,and the bilateral femoral heads of rabbits were removed for hematoxylin-eosin staining,and the apoptosis of cells in the femoral head area was observed by TUNEL staining.RT-qPCR analyzed the expression of Bax and Bcl-2 genes,and Western blot detected the expression levels of pathway proteins Wnt,β-catenin,GSK-3β,AKT and p-AKT.Results:Compared with the control group,the expression levels of ALP and TGF-β1 in rabbit bone tissue in the model group decreased significantly(P<0.05),the bone trabeculae were sparse and thinned,the number of hollow bone fosses and the number of apoptosis-positive cells increased significantly(P<0.05),the expression of pro-apoptotic gene Bax was increased,and the expression of anti-apoptotic gene Bcl-2 was inhibited(P<0.05).After the intervention and treatment of bone palsy granules,the hollow bone depression and apoptosis of rabbit bone tissue in the experimental group were effectively improved(P<0.05).In addition,compared with the model group,the osteopathic elimination particles could upregulate the expression of ALP and TGF-β1(P<0.05),promote the expression of pathway proteins Wnt andβ-catenin,increase the phosphorylation level of AKT,and downregulate the expression of GSK-3β(P<0.05).Conclusion:Under glucocorticoids,osteoblast development dysfunction and apoptosis increase.Bone palsy granules can regulate the two signaling pathways of Wnt/PI3K-AKT,promote osteoblast development and inhibit apoptosis,effectively maintain bone metabolic balance,prolong the collapse time of the femoral head,and further treat osteonecrosis of the femoral head.

The role and research progress of PI3K/AKT signaling pathway in non-traumatic osteonecrosis of the femoral head

Non-traumatic osteonecrosis of the femoral head(NONFH)is one of the most common orthopedic diseases,influenced by multiple signaling pathways and inflammatory factors.The PI3K/AKT signaling pathway is closely related to various biological processes such as apoptosis,autophagy,and metabolism in cells.Increasing evidence suggests that it plays an important role in the development of femoral head necrosis.This paper aims to explore the mechanism of the PI3K/AKT signaling pathway in the pathogenesis of NONFH by analyzing its regulation of lipid metabolism,cell apoptosis and autophagy,and intravascular coagulation.This study provides new insights for the research of NONFH.

Effects of individual shock wave therapy vs celecoxib on hip pain caused by femoral head necrosis

BACKGROUND Celecoxib has been used to treat hip discomfort and functional difficulties associated with osteonecrosis of the femoral head(ONFH),although significant adverse reactions often follow long-term use.Extracorporeal shock wave therapy(ESWT)can delay the progression of ONFH,alleviate the pain and functional limitations it causes,and avoid the adverse effects of celecoxib.AIM To investigate the effects of individual ESWT,a treatment alternative to the use of celecoxib,in alleviating pain and dysfunction caused by ONFH.METHODS This was a randomized,controlled,double-blinded,non-inferiority trial.We examined 80 patients for eligibility in this study;8 patients were excluded based on inclusion and exclusion criteria.A total of 72 subjects with ONFH were randomly assigned to group A(n=36;celecoxib+alendronate+sham-placebo shock wave)or group B(n=36;individual focused shock wave[ESWT based on magnetic resonance imaging three-dimensional(MRI-3D)reconstruction]+alendronate).The outcomes were assessed at baseline,at the end of treatment,and at an 8-wk follow-up.The primary outcome measure was treatment efficiency after 2 wk of intervention using the Harris hip score(HHS)(improvement of 10 points or more from the baseline was deemed sufficient).Secondary outcome measures were post-treatment HHS,visual analog scale(VAS),and Western Ontario and McMaster Universities Osteoarthritis Index(WOMAC)scores.RESULTS After treatment,the pain treatment efficiency of group B was greater than that of group A(69%vs 51%;95%CI:4.56%to 40.56%),with non-inferiority thresholds of-4.56%and-10%,respectively.Furthermore,the HHS,WOMAC,and VAS scores in group B dramatically improved during the follow-up period as compared to those in group A(P<0.001).After therapy,the VAS and WOMAC in group A were significantly improved from the 2nd to 8th wk(P<0.001),although HHS was only significantly altered at the 2 wk point(P<0.001).On the 1st d and 2nd wk after treatment,HHS and VAS scores were different between groups,with the difference in HHS lasting until week 4.Neither group had severe complications such as skin ulcer infection or lower limb motorsensory disturbance.CONCLUSION Individual shock wave therapy(ESWT)based on MRI-3D reconstruction was not inferior to celecoxib in managing hip pain and restrictions associated with ONFH.

Current concepts on osteonecrosis of the femoral head

It is estimated that 20000 to 30000 new patients are diagnosed with osteonecrosis annually accounting for approximately 10% of the 250000 total hip arthroplasties done annually in the United States. Thelack of level 1 evidence in the literature makes it difficult to identify optimal treatment protocols to manage patients with pre-collapse avascular necrosis of the femoral head, and early intervention prior to collapse is critical to successful outcomes in joint preserving procedures. There have been a variety of traumatic and atraumatic factors that have been identified as risk factors for osteonecrosis, but the etiology and pathogenesis still remains unclear. Current osteonecrosis diagnosis is dependent upon plain anteroposterior and frog-leg lateral radiographs of the hip, followed by magnetic resonance imaging(MRI). Generally, the first radiographic changes seen by radiograph will be cystic and sclerotic changes in the femoral head. Although the diagnosis may be made by radiograph, plain radiographs are generally insufficient for early diagnosis, therefore MRI is considered the most accurate benchmark. Treatment options include pharmacologic agents such as bisphosphonates and statins, biophysical treatments, as well as joint-preserving and joint-replacing surgeries. the surgical treatment of osteonecrosis of the femoral head can be divided into two major branches: femoral head sparing procedures(FHSP) and femoral head replacement procedures(FHRP). In general, FHSP are indicated at pre-collapse stages with minimal symptoms whereas FHRP are preferred at post-collapse symptomatic stages. It is difficult to know whether any treatment modality changes the natural history of core decompression since the true natural history of core decompression has not been delineated.

Osteonecrosis of the femoral head: An update in year 2012

Osteonecrosis is a phenomenon involving disruption to the vascular supply to the femoral head, resulting in articular surface collapse and eventual osteoarthritis. Although alcoholism, steroid use, and hip trauma remain the most common causes, several other etiologies for osteonecrosis have been identified. Basic science research utilizing animal models and stem cell applications continue to further elucidate the pathophysiology of osteonecrosis and promise novel treatment options in the future. Clinical studies evaluating modern joint-sparing procedures have demonstrated significant improvements in outcomes, but hip arthroplasty is still the most common procedure performed in these affected younger adults. Further advances in joint-preserving procedures are required and will be widely studied in the coming decade.

Vascular endothelial growth factor for the treatment of femoral head osteonecrosis: An experimental study in canines

AIM To evaluate the treatment of osteonecrosis of the femoral head(ONFH) with the use of vascular endothelial growth factor(VEGF).METHODS In 30 mature beagles(6 groups of 5 beagles) ONFH was induced cryosurgically and one of the following solutions was administered locally in the femoral head(FH) in each group: Single injection of 500 μg VEGF(t-VEGFμ group); single injection of 500 ng VEGF(t-VEGFn group); continuous delivery of 500 μg VEGF through osmotic micropump(t-VEGFpump-μ group); continuous delivery of 500 ng VEGF through osmotic micropump(t-VEGFpump-n group); single injection of 0.9% sodium chloride(t-NS group), while one group that served as control group did not receive any local solution(No-t group). FHs were retrieved 12 wk postoperatively, underwent decalcification and hematoxylin/eosin and toluidine blue staining. In two canines per group, one half of FH was processed without decalcification and stained with modified Masson Trichrome. Histological sections were observed by light microscopy and measured with a semi-automatized bone histomorphometry system and Bone Volume/Total Volume(BV/TV), Marrow Volume/Total Volume(MaV/TV), and Trabecular Thickness(TbT h) were assessed. Standard and robust tests(Welch, Brown Forsythe) of analysis of variance along with multiple comparisons, were carried out among the categories.RESULTS The untreated(No-t) group had signs of osteonecrosis, whereas the VEGF groups revealed reversal of the osteonecrosis. Statistical analysis of the decalcified specimens revealed a significantly better BV/TV ratio and a higher Tb Th between the VEGF treatment groups(except the t-VEGFn group) and the No-t group or the control t-NS group. Single dose 500 μg VEGF group had significantly better BV/TV ratio and higher Tb Th when compared to the No-t group(50.45 ± 6.18 vs 29.50 ± 12.27, P = 0.002 and 151.44 ± 19.07 vs 107.77 ± 35.15, P = 0.161 respectively) and the control t-NS group(50.45 ± 6.18 vs 30.9 ± 6.67, P = 0.004 and 151.44 ± 19.07 vs 107.14 ± 35.71, P = 0.151 respectively). Similar differences were found for the prolonged VEGF delivery/pump groups of 500 μg and 500 ng. Analysis of the totality of specimens(decalcified/non-decalcified) enhanced the aforementioned differences and additionally revealed significant differences in the comparison of the TbT h.CONCLUSION In an experimental model of ONFH in canines it was found that local treatment with VEGF leads to bone tissue remodeling and new bone formation.

Effect of <i>Qing’e Pill</i>plus <i>Salvia</i>on Non-Traumatic Osteonecrosis of the Femoral Head of Idiopathic Type in Earlier Stage: A Case Report of a Twelve-Month of Period

Background: Compromised circulatory and bone/lipid metabolic dysfunction are two major contributors to non-traumatic osteonecrosis of the femoral head (ONFH). Qing’e pill plus Salvia has significant anti-inflammatory and anti-atherosclerotic action, and it could also regulate bone formation and remodeling by suppressing osteoclasts. Case Report: We describe a case of a 62-year- old man with ONFH of idiopathic type in earlier stage that could not be adequately controlled with oral non-steroidal analgesics and restoring bone loss agents for past 3 years. After six months treatment with Qing’e pill plus Salvia, the plasma low-density lipoprotein (LDL), high-density lipoprotein (HDL), apolipoprotein A1 (apo A1), apolipoprotein B (apo B), total cholesterol (TC), triglycerides (TG), and blood viscosity were measured on an empty stomach. The Harris scores were maintained during a six months follow-up after discontinuation of Qing’e pill plus Salvia. Discussion: Our case has shown that plasma levels of inflammatory and atherosclerotic relaxed factors and the Harris scores may be controlled with herbal medication in ONFH of idiopathic type in earlier stage that could not be adequately controlled with oral non-steroidal analgesics and restoring bone loss agents.

Surface-based map plasticity of brain regions related to sensory motor and pain information processing after osteonecrosis of the femoral head

Pain is one of the manifestations of hip disorder and has been proven to lead to the remodeling of somatotopic map plasticity in the cortex.However,most studies are volume-based which may lead to inaccurate anatomical positioning of functional data.The methods that work on the cortical surface may be more sensitive than those using the full brain volume and thus be more suitable for map plasticity study.In this prospective cross-sectional study performed in Yueyang Hospital of Integrated Traditional Chinese and Western Medicine,Shanghai University of Traditional Chinese Medicine,China,20 patients with osteonecrosis of the femoral head(12 males and 8 females,aged 56.80±13.60 years)and 20 healthy controls(9 males and 11 females,aged 54.56±10.23 years)were included in this study.Data of resting-state functional magnetic resonance imaging were collected.The results revealed that compared with healthy controls,compared with the healthy controls,patients with osteonecrosis of the femoral head(ONFH)showed significantly increased surface-based regional homogeneity(Re Ho)in areas distributed mainly in the left dorsolateral prefrontal cortex,frontal eye field,right frontal eye field,and the premotor cortex and decreased surface-based Re Ho in the right primary motor cortex and primary sensory cortex.Regions showing significant differences in surfacebased Re Ho values between the healthy controls and patients with ONFH were defined as the regions of interests.Seed-based functional connectivity was performed to investigate interregional functional synchronization.When the areas with decreased surface-based Re Ho in the frontal eye field and right premotor cortex were used as the regions of interest,compared with the healthy controls,the patients with ONFH displayed increased functional connectivity in the right middle frontal cortex and right inferior parietal cortex and decreased functional connectivity in the right precentral cortex and right middle occipital cortex.Compared with healthy controls,patients with ONFH showed significantly decreased cortical thickness in the para-insular area,posterior insular area,anterior superior temporal area,frontal eye field and supplementary motor cortex and reduced volume of subcortical gray matter nuclei in the right nucleus accumbens.These findings suggest that hip disorder patients showed cortical plasticity changes,mainly in sensorimotor-and pain-related regions.This study was approved by the Medical Ethics Committee of Yueyang Hospital of Integrated Traditional Chinese and Western Medicine,Shanghai University of Traditional Chinese Medicine(approval No.2018-041)on August 1,2018.

Relationships among magnetic resonance imaging, histological findings, and IGF-I in steroid-induced osteonecrosis of the femoral head in rabbits

Objective: To study the relationships among magnetic resonance imaging (MRI), histological findings, and insu- lin-like growth factor-I (IGF-I) in steroid-induced osteonecrosis of the femoral head in rabbits. Methods: Thirty rabbits were randomly divided into experimental Group A (n=15) and control Group B (n=15). The 7.5 mg/kg (2 ml) of dexamethasone (DEX) and physiological saline (2 ml) were injected into the right gluteus medius muscle twice at one-week intervals in animals of Groups A and B, respectively. At 4, 8 and 16 weeks after obtaining an MRI, the rabbits were sacrificed and the femoral head from one side was removed for histological study of lacunae empty of osteocytes, subchondral vessels, and size of fat cells under microscopy, and the femoral head from the other side was removed for enzyme-linked immunoadsorbent assay (ELISA) for IGF-I. Results: At 4, 8 and 16 weeks after treatment, no necrotic lesions were detected in Group B, while they were detected in Group A. Light microscopy revealed that the fat cells of the marrow cavity were enlarged, subchondral vessels were evidently decreased, and empty bone lacunae were clearly increased. The IGF-I levels in Group A were significantly higher than those in Group B. At 8 weeks after the DEX injection, the MRI of all 20 femora showed an inhomogeneous, low signal intensity area in the femoral head, and at 16 weeks, the findings of all 10 femora showed a specific "line-like sign". The MRI findings of all femora in Group B were normal. Conclusion: MRI is a highly sensitive means of diagnosing early experimental osteonecrosis of the femoral head. However, the abnormal marrow tissues appeared later than 4 weeks when the expression of IGF-I increased. This reparative factor has an early and important role in response to steroid-induced osteonecrosis of the femoral head, and provides a theoretical foundation for understanding the pathology and designing new therapies.

Traditional Chinese Medicine nursing protocols for osteonecrosis of the femoral head in adults

Osteonecrosis of the femoral head (ONFH) is a disabling pathology influencing the population averagely aged 33-38 years. It is characterized by a compromised subchondral microcirculation, especially in the small retinacular vessels. The prevalence of ONFH is relatively high in China. At present, the surgery is the optimal treatment modality for ONFH, but it still can result in many complications. In recent years, traditional Chinese Medicine (TCM) has shown unique advantages in ONFH, including internal application and external application of Chinese herbs, TCM fumigation, TCM iontophoresis, TCM Tazi and so on. This article primarily investigated the key points of common syndromes, TCM nursing methods and healthy guidance of ONFH in adults, aiming at maintaining and developing the strengths of TCM, improving its efficacy and standardizing its behavior.

Gene testing for osteonecrosis of the femoral head in systemic lupus erythematosus using targeted next-generation sequencing:A pilot study

BACKGROUND Previous publications indicated that genetic predisposition might play important roles in the onset of osteonecrosis of the femoral head(ONFH)in systemic lupus erythematosus(SLE).Some gene loci such as complement C3d receptor 2(CR2),nitric oxide synthase 3(NOS3),collagen type II alpha 1 chain(COL2A1),protein tyrosine phosphatase non-receptor type 22(PTPN22),and transient receptor potential cation channel subfamily V member 4(TRPV4)were reported to be involved in this process.AIM To investigate whether the risk of ONFH in SLE is associated with single nucleotide variations(SNVs)in these five genes.METHODS SNVs in the CR2,NOS3,COL2A1,PTPN22,and TRPV4 genes were examined by using FastTarget and Illumina Miseq sequencing technologies in 49 cases of SLE with ONFH.Burrows–wheeler aligner was used to align the sequencing reads to hg19,and GATK and Varscan programs were used to perform SNV calling.PolyPhen-2,SIFT,and MutationTaster were used to assess the functional effects of non-synonymous SNVs.RESULTS Six of the 49 patients were confirmed to have low frequency SNVs,including one patient with SNVs in NOS3(exon 6:c.814G>A:p.E272K and exon 7:c.814G>A:p.E272K.),four in COL2A1(rs41263847:exon 29:c.1913C>T:p.T638I,exon 28:c.1706C>T:p.T569I,and rs371445823:exon 8:c.580G>A:p.A194T,exon 7:c.373G>A:p.A125T),and one in CR2(rs45573035:exon 2:c.200C>G:p.T67S).CONCLUSION The onset of ONFH in SLE might be associated with the identified SNVs in NOS3,COL2A1,and CR2.

Superior Retinacular Artery Did Not Occlude in a Rat Model of the Non-Traumatic Osteonecrosis of the Femoral Head

Non-traumatic osteonecrosis of the femoral head (ONFH) is believed to be avascular necrosis. Certainly, a disruption of a supplying artery induces necrosis in the supplying artery-dominant region. However, when an abnormality such as cell apoptosis, or another reason, is developed in the supplying artery-dominant region, it induces a disruption of the supplying artery. Therefore, to prove that ONFH is avascular necrosis, it is necessary to demonstrate the disruption of the supplying artery prior to histological osteonecrosis development. Here we investigate histologically, using a rat model, whether disruption of the supplying artery occurs before the initial development of ONFH following corticosteroid treatment. Rats were given imiquimod and methylprednisolone, and were sacrificed 1, 2, 3, 7 or 14 days after the last injection. At the sacrifice, the rat was perfused with 20 ml black Indian ink through the left ventricle. ONFH was observed in the Imiquimod + Methylprednisolone group at 7 and 14 days. The osteonecrotic area was not stained with perfused black Indian ink. However, the lateral portion of the femoral head near the superior retinacular artery was stained with the ink. In conclusion, the present study shows that the superior retinacular artery did not occlude before the initial development of ONFH histologically in rats.

Advances in needle-knife for the treatment of early and middle stage Osteonecrosis of the Femoral Head

Osteonecrosis of the Femoral Head (ONFH) is a refractory disease of orthopedics, and its incidence is gradually increasing. Often due to lack of timely intervention, the femoral head collapses, eventually causing hip pain and difficulty in activities. At present, the treatment of hip preservation after the collapse of osteonecrosis of the femoral head has received everyone's attention, but many hip-preserving measures are controversial in terms of efficacy and indications. Needle-knife therapy is a kind of hip-protection therapy with low risk, small trauma, bleeding, and less and shorter treatments. This article reviews the literatures related to needle-knife therapy for osteonecrosis of the femoral head, and summarizes the clinical treatment of osteonecrosis of the femoral head based on needle-knife, and prospects for its research.

Correlation analysis of osteonecrosis of the femoral head with blood lipid and coagulation indexes

Objective: To explore the correlation between different types of osteonecrosis of the femoral head and blood lipids and coagulation indexes, in order to provide relevant references for the pathogenesis of osteonecrosis of the femoral head. Methods: 308 cases of ONFH were divided into alcohol group (165 cases), hormone group (113 cases), trauma group (30 cases), and basic data of patients were collected. Blood lipid indicators: total cholesterol, triglycerides, high density lipoprotein cholesterol, low density lipoprotein cholesterol, apolipoprotein A, apolipoprotein B;coagulation indicators: activated partial thromboplastin time, plasma prothrombin time, fibrinogen, thrombin time indicators, using analysis of variance method for different types of osteonecrosis of the femoral head and blood lipids, coagulation indicators Search for relevance. Results: 1. Comparison of three groups of blood lipid indicators: total cholesterol and low density lipoprotein cholesterol in the alcohol group were higher than those in the trauma group (P<0.05);total cholesterol, triglycerides, and low density lipoprotein in the alcohol group The three indexes of cholesterol were higher than those of the hormone group (P<0.05). There was no significant difference in the serum lipid indexes of the hormone group and the trauma group (P>0.05). 2. Comparison of three groups of coagulation indicators: hormone The fibrinogen index of the group was higher than that of the trauma group (P<0.05). There was no significant difference in the coagulation index between the alcohol group and the trauma group (P>0.05). The coagulation index of the hormone group and the alcohol group was compared. The differences were not statistically significant (P>0.05). Conclusions: 1. Non-traumatic osteonecrosis of the femoral head (alcoholic, hormonal) patients are characterized by markedly elevated blood lipids (total cholesterol, low density lipoprotein cholesterol) and coagulation (fibrinogen) indicators;2. Intravascular coagulation and lipid metabolism disorders may be the pathological basis of non-traumatic Osteonecrosis of the femoral head.

Research progress of microRNA in prevention and treatment of osteonecrosis of the femoral head

In the 1980s,Feinbaum et al.first discovered miRNA in the development of worms and termed it as Lin-4.With the development of microbial science and continuous improvement in the gene sequencing technology,miRNA has been gradually gaining attention for intensive research in clinical medicine.Among these,one group of miRNAs has been confirmed to play fundamental roles in gene regulation in various orthopedics diseases,such as bone tumors,osteoarthritis,and rheumatoid arthritis.The study of miRNAs in the osteonecrosis of the femoral head(ONFH)can improve the understanding of the pathogenesis of the disease.ONFH is an orthopedic disease that is the primary cause of disrupted blood supply to the femoral head and the main symptoms of bone and muscle dysfunction.Recent studies showed that miRNA played a major role in the regulation of the microcirculation of ONFH,damage and repair of blood vessels,local microcirculation dysfunction caused by other diseases,and apoptosis of bone cells.In this study,recent related research results of miRNA and ONFH were analyzed and summarized,and the prospective in the prevention and treatment of the disease was also discussed.

Avascular osteonecrosis of the femoral head during HIV infection and antiretroviral therapy: a case report

Avascular osteonecrosis of the femoral head is increasingly affecting HIV-infected patients. Several factors may contribute to its occurrence, including antiretroviral therapy and its complications. We report a case of avascular necrosis of the femoral head in a black woman infected with HIV and treated with antiretroviral drugs in Lomé, Togo, for about 13 years at the time of consultation and with therapeutic success. The antiretroviral treatment included a protease inhibitor initiated 3 years before the onset of the symptomatology which was marked by bilateral hip pain. Biochemical tests showed hypercholesterolemia (total and LDL-cholesterol) and a slight increase in triglycerides. Antiretroviral treatment with a protease inhibitor was changed to an integrase inhibitor. The surgical treatment that was indicated could not be performed because of the patient’s lack of financial means.

Association of Toll-like receptor 4 Signaling Pathway with Steroid-induced Femoral Head Osteonecrosis in Rats

Osteonecrosis of the femoral head is frequently observed in patients treated with excessive corticosteroids. However, the pathogenesis of corticosteroid-induced osteonecrosis remains unclear. The purpose of this study was to investigate the role of Toil-like receptor 4 （TLR4） signaling pathway in steroid-induced femoral head osteonecrosis in rats. Male Sprague-Dawley rats were injected intramus- cularly with 20 mg/kg methylprednisolone （MP） for 8 weeks, twice per week. The animals were sacri- ficed at 2, 4 and 8 weeks after the last MP injection, respectively, and then allocated to the 2-, 4- and 8-week model groups （n=24 each）. Rats in the control group （n=12） were not given any treatment. Histopathological analysis was performed and the concentration of tartrate-resistant acid phosphatase （TRAP） in plasma was determined. The activation of osteoclasts in the femoral head was assessed by TRAP staining. The expression of TLR4, MyD88, TRAF6 and NF-Id3 p65 that are involved in TLR4 signaling, and MCP-1 production were detected by using real-time PCR （RT-PCR） and Western blotting. The results showed that the osteonecrosis in the femoral head was clearly observed and the concentra- tion of TRAP in the plasma was increased in the model rats. The femoral head tissues in MP-treated rats were positive for TRAP and the intensity of TRAP staining was greater in MP-treated rats than in con- trol rats. As compared with the control group, the mRNA expression of TLR4 signaling-related factors was enhanced significantly at 4 and 8 weeks, and the protein levels of these factors increased signifi- cantly with time. It was concluded that MP could induce the femoral head osteonecrosis in rats, which was associated with osteoclast activation via the TLR4 signaling pathway. These findings suggest that TLR4 signaling pathway plays a pivotal role in the pathogenesis of steroid-induced osteonecrosis.

Protective Effect of Human Umbilical Cord Mesenchymal Stem Cells in Glucocorticoid-induced Osteonecrosis of Femoral Head

Objective:To evaluate the effect of human umbilical cord mesenchymal stem cells(hUC-MSCs)on preventing rats from glucocorticoid-induced osteonecrosis of femoral head(GC-ONFH)in the early stage in vivo and to investigate the possible mechanism of hUC-MSCs in regulating the balance of osteogenesis and adipogenesis.Methods:All rats were randomly divided into 3 groups:control group(C group),model group(M group),and intervention group(Ⅰ group).The model of GC-ONFH was developed by a sequential administration of lipopolysaccharide and methylprednisolone.The rats in the Ⅰ group were treated with caudal vein injection of hUC-MSCs.Six weeks later,the blood samples were obtained to measure the activity of alkaline phosphatase(ALP)and the content of triglyceride(TG)in serum,and the femoral heads were harvested and observed by hematoxylin-eosin staining,Micro-CT,Western blot and real-time quantitative polymerase chain reaction.Results:After intervention of hUC-MSCs,the necrosis rate of femoral head decreased from 83%(10/12)to 33%(4/12),the rate of empty bone lacuna was significantly decreased,the activity of ALP increased significantly,the content of TG decreased significantly,the bone density increased obviously,the expression of RUNX2 and Col Ⅰ increased significantly and the expression of PPARγ decreased significantly.Conclusion:These results revealed that caudal vein injection of hUC-MSCs can effectively reduce the incidence of GC-ONFH in rats by increasing ALP activity and reducing TG content in serum,increasing bone mineral density,promoting the expression of RUNX2 and Col I,and inhibiting the expression of PPARγ.

Modified technique of advanced core decompression for treatment of femoral head osteonecrosis

BACKGROUND Osteonecrosis of the femoral head(ONFH)is a destructive condition most commonly affecting young and middle-aged patients.The leading consequence of ONFH is often a significant articular disability.Effective joint-preserving surgical treatments are urgently needed for patients with early stage ONFH when outcomes of treatment are in general better than the advanced stage disease.AIM To introduce a new surgery procedure called percutaneous expanded core decompression and mixed bone graft technique,which is a new way of jointpreserving surgical treatments.METHODS The clinical data of 6 patients with ONFH diagnosed and treated with the procedure called percutaneous expanded core decompression and mixed bone graft technique at The First Hospital of Qiqihar from March 2013 to August 2019 were retrospectively analyzed;the follow-up ended in December 2019.RESULTS There were 6 male patients with an average age of 43 years in our study.Gratifying results have been obtained from the comparison of Harris hip score,visual analogue scale,and imaging examination before and after operation.CONCLUSION This new modified technique is simple,safe,and reliable.No serious perioperative complications were observed in our cases.Advantages of the single blade expandable reamer are obvious.The adjuvant substance is inexpensive and easy to obtain.Thus,this technique is an effective joint-preserving surgical treatment for patients with early stage of ONFH.