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1.
Urol J ; 16(3): 260-266, 2019 06 17.
Article in English | MEDLINE | ID: mdl-30206921

ABSTRACT

PURPOSE: To investigate the impact of prostate weight on outcomes of nerve sparing laparoscopic radical prosta-tectomy (LRP) and assess its predictive value on postoperative continence and potency recovery. MATERIALS AND METHODS: We conducted a retrospective study on the clinical data of 165 patients with low risk prostate cancer (PCa) who underwent nerve sparing LRP. All the patients included had normal preoperative uri-nary and sexual function. The association of prostate weight with perioperative data was assessed using Spearman correlation coefficient. Univariate and multivariate Cox regression analyses were employed to identify prognostic predictors for continence and potency recovery. RESULTS: Increased prostate weight was significantly associated with older age, higher prostate-specific antigen (PSA), lower biopsy and pathological T stage and Gleason score, longer operative time, and higher estimated blood loss (P < .05). The continence rates at the 3rd, 6th, and 12th month after surgery were 63.6% (105/165), 87.9% (145/165), and 95.8% (158/165); and the potency rates were 44.8% (74/165), 62.4% (103/165) and 77.6% (128/165), respectively. Furthermore, multivariate Cox analysis showed that patient age (HR = 0.52, 95% CI: 0.35- 0.76) and prostate weight (HR = 0.54, 95% CI: 0.34-0.86) were independent predictors for continence recovery, while only patient age (HR = 0.66, 95% CI: 0.45-0.96) could independently predict potency recovery. CONCLUSION: Larger prostate size was correlated with older age, higher PSA, lower tumor stage and grade, longer operative time, and more intraoperative blood loss in low risk PCa patients. Increased prostate weight may inde-pendently predict poor continence recovery after nerve sparing LRP.


Subject(s)
Laparoscopy , Prostate/pathology , Prostatectomy/methods , Prostatic Neoplasms/pathology , Prostatic Neoplasms/surgery , Aged , Erectile Dysfunction/epidemiology , Humans , Male , Middle Aged , Organ Size , Organ Sparing Treatments , Postoperative Complications/epidemiology , Predictive Value of Tests , Prostate/innervation , Prostate/surgery , Retrospective Studies , Risk Assessment , Treatment Outcome , Urinary Incontinence/epidemiology
2.
Asian J Androl ; 20(1): 56-61, 2018.
Article in English | MEDLINE | ID: mdl-28382925

ABSTRACT

The present study analyzed the predictive value of combined analysis of collapsin response mediator protein 4 (CRMP4) methylation levels and the Cancer of the Prostate Risk Assessment (CAPRA-S) Postsurgical score of patients who required adjuvant hormone therapy (AHT) after radical prostatectomy (RP). We retrospectively analyzed 305 patients with prostate cancer (PCa) who received RP and subsequent androgen deprivation therapy (ADT). Two hundred and thirty patients with clinically high-risk PCa underwent immediate ADT, and 75 patients with intermediate risk PCa underwent deferred ADT. CRMP4 methylation levels in biopsies were determined, and CAPRA-S scores were calculated. In the deferred ADT group, the values of the hazard ratios for tumor progression and cancer-specific mortality (CSM) in patients with ≥15% CRMP4 methylation were 6.81 (95% CI: 2.34-19.80) and 12.83 (95% CI: 2.16-26.10), respectively. Receiver-operating characteristic curve analysis indicated that CRMP4 methylation levels ≥15% served as a significant prognostic marker of tumor progression and CSM. In the immediate ADT group, CAPRA-S scores ≥6 and CRMP4 methylation levels ≥15% were independent predictors of these outcomes (uni- and multi-variable Cox regression analyses). The differences in the 5-year progression-free survival between each combination were statistically significant. Combining CAPRA-S score and CRMP4 methylation levels improved the area under the curve compared with the CRMP4 or CAPRA-S model. Therefore, CRMP4 methylation levels ≥15% were significantly associated with a poor prognosis and their combination with CAPRA-S score accurately predicted tumor progression and metastasis for patients requiring AHT after RP.


Subject(s)
Muscle Proteins/metabolism , Prostatic Neoplasms/diagnosis , Aged , Androgen Antagonists/therapeutic use , Biomarkers, Tumor/blood , Female , Hormone Replacement Therapy , Humans , Male , Methylation , Middle Aged , Neoplasm Grading , Neoplasm Metastasis , Neoplasm Staging , Prognosis , Progression-Free Survival , Prostatectomy , Prostatic Neoplasms/metabolism , Retrospective Studies , Risk Assessment , Treatment Outcome
3.
Biomed Pharmacother ; 85: 704-711, 2017 Jan.
Article in English | MEDLINE | ID: mdl-27923689

ABSTRACT

Acute renal injury is a common severe clinical syndrome, occurring in many clinical situations. It is necessary to explore effective drugs to treat it. Eupafolin is a flavonoid compound, derived from Phyla nodiflora, which has been previously reported to possess a variety of pharmacological activities, including anti-inflammatory and antioxidant effects. However, it is known little about how it works in acute renal injury. Also, eupafolin is characterized by skin penetration and poor water solubility, limiting its clinical applications. Thus, we synthesized an eupafolin nanoparticle delivery system. We found that eupafolin nanoparticle could address the physicochemical defects of raw eupafolin and increase water solubility without any toxicity to normal renal cells via reducing particle size. Eupafolin nanoparticle attenuated LPS-induced acute renal injury in mice through inhibiting oxidative stress and inflammation accompanied with up-regulated SOD activity and down-regulated pro-inflammatory cytokines. Additionally, inactivation of NF-κB and MAPKs of p38, ERK1/2 and JNK signaling pathways was a main molecular mechanism by which eupafolin nanoparticle improved renal injury. Together, eupafolin nanoparticle exhibits effective anti-oxidant and anti-inflammatory activities, which could be used as a potential drug to ameliorate acute renal injury clinically.


Subject(s)
Acute Kidney Injury/chemically induced , Flavones/pharmacology , Inflammation/chemically induced , Lipopolysaccharides/toxicity , Nanoparticles/chemistry , Reactive Oxygen Species/antagonists & inhibitors , Acute Kidney Injury/prevention & control , Animals , Antioxidants/administration & dosage , Antioxidants/chemistry , Antioxidants/pharmacology , Cell Line , Flavones/administration & dosage , Flavones/chemistry , Inflammation/prevention & control , Mice , Podocytes/drug effects
4.
Oxid Med Cell Longev ; 2016: 1469693, 2016.
Article in English | MEDLINE | ID: mdl-27803760

ABSTRACT

TRPM7 is a potential therapeutic target for treatment of prostate cancer. In this study, we investigated the effects of nonselective TRPM7 inhibitor carvacrol on cell proliferation, migration, and invasion of prostate cancer PC-3 and DU145 cells. Our results showed that carvacrol blocked TRPM7-like currents in PC-3 and DU145 cells and reduced their proliferation, migration, and invasion. Moreover, carvacrol treatment significantly decreased MMP-2, p-Akt, and p-ERK1/2 protein expression and inhibited F-actin reorganization. Furthermore, consistently, TRPM7 knockdown reduced prostate cancer cell proliferation, migration, and invasion as well. Our study suggests that carvacrol may have therapeutic potential for the treatment of prostate cancer through its inhibition of TRPM7 channels and suppression of PI3K/Akt and MAPK signaling pathways.


Subject(s)
Cell Proliferation/drug effects , Monoterpenes/toxicity , Signal Transduction/drug effects , Cell Line, Tumor , Cell Movement/drug effects , Cymenes , Gene Expression Regulation, Neoplastic/drug effects , Humans , Male , Matrix Metalloproteinase 2/metabolism , Microscopy, Fluorescence , Mitogen-Activated Protein Kinase 1/metabolism , Mitogen-Activated Protein Kinase 3/metabolism , Patch-Clamp Techniques , Phosphatidylinositol 3-Kinases/metabolism , Phosphorylation/drug effects , Prostatic Neoplasms/metabolism , Prostatic Neoplasms/pathology , Proto-Oncogene Proteins c-akt/metabolism , RNA Interference , RNA, Small Interfering/metabolism , TRPM Cation Channels/antagonists & inhibitors , TRPM Cation Channels/genetics , TRPM Cation Channels/metabolism
5.
Am J Transl Res ; 8(2): 670-9, 2016.
Article in English | MEDLINE | ID: mdl-27158359

ABSTRACT

Odontogenic ameloblast associated protein (ODAM) is a protein contributed to cell adhesion and has been shown to express in normal prostate tissue, but the expression and significance of ODAM in prostate cancer remain unknown. In this study, we detected the protein expressions of ODAM in 88 prostate cancer tissues with immunohistochemical staining, and found that 53 cases (60.2%) was high expression of ODAM, which was shown in the cytoplasm and paranuclear regions. Furthermore, low expression of ODAM was significantly correlated with lymph node metastasis, preoperative PSA and Gleason score, but not with mean age, follow-up duration, PSM rate and distribution of pathological T stage. Additionally, our results of multivariate analysis showed that low ODAM expression was an independent predictor of biomedical recurrence, while the positive lymph node metastasis, Gleason score, and preoperative PSA were not the independent risks for biomedical recurrence. Overexpression of ODAM did not inhibit the growth of prostate cancer cells PC3, but significant suppressed their invasion and migration with decrease of the protein levels of MMP-2. These results suggest that ODAM is a predictor for biomedical recurrence and inhibits the migration and invasion of prostate cancer.

6.
Oncol Lett ; 11(4): 2532-2538, 2016 Apr.
Article in English | MEDLINE | ID: mdl-27073512

ABSTRACT

Currently, there are no well-established preoperative clinicopathological parameters for predicting extra-prostatic extension (EPE) in patients with clinically localised prostate cancer (PCa). The transmembrane protease serine 2 (TMPRSS2)-ETS-related gene (ERG) fusion gene is a specific biomarker of PCa and is considered a prognostic predictor. The aim of the present study was to assess the value of this marker for predicting EPE in patients with clinically localised PCa. In total, 306 PCa patients with clinically localised disease, including 220 patients (71.9%) with organ-confined disease and 86 EPE cases (28.1%), were included in the study. Receiver operating characteristic curves and logistic regression were employed to establish the optimal cut-off value and to investigate whether ERG rearrangement was an independent predictor for the EPE of clinically localised PCa. A leave-one-out cross-validation (LOOCV) model was implemented to validate the predictive power of ERG rearrangement. An increase in ERG rearrangements was identified to be associate'd with EPE, and the optimal cut-off for predicting EPE was determined to be 2.25%, with a sensitivity of 70.24% [95% confidence interval (CI), 62.6-78.9%], a specificity of 80.43% (95% CI, 75.4-85.1%), and an area under the curve (AUC) of 0.781 (95% CI, 0.730-0.826). In the LOOCV model, ERG rearrangement also demonstrated good performance for predicting EPE (sensitivity, 76.923%; specificity, 71.429%; 95% CI for AUC, 0.724-0.958). In addition, a high Gleason score (≥7) and a cT2c classification upon biopsy were independent factors for EPE.

7.
Urol J ; 12(3): 2154-9, 2015 Jul 01.
Article in English | MEDLINE | ID: mdl-26135931

ABSTRACT

PURPOSE: To analyze and compare surgical, oncological and functional outcomes of laparoscopic radi­cal prostatectomy (LRP) in patients with and without previous transurethral resection of the prostate (TURP). MATERIALS AND METHODS: In total, 785 men underwent LRP at our institution from January 2002 to December 2012. TURP had been performed previously in 35 of these patients (TURP group). A matched-pair analysis iden­tified 35 additional men without previous TURP who exhibited equivalent clinicopathological characteristics to serve as a control group. Perioperative complications and surgical, functional, and oncological outcomes were compared between the two groups. RESULTS: The groups were similar in age, body mass index, serum prostate-specific antigen level, and pre- and post-operative Gleason scores. Patients in the TURP group had greater blood loss (231 vs. 139 mL), longer opera­tive times (262 vs. 213 min), a greater probability of transfusion (8.6% vs. 0%), and a higher rate of complications (37.1% vs. 11.4%) compared with the control group. The positive surgical margin rate was higher in the TURP group, but this difference was not statistically significant (P = .179). The continence rates at one year after surgery were similar, but a lower continence rate was identified in the TURP group (42.9% vs. 68.6%) at 3 months. Bio­chemical recurrence developed in 17.1% and 11.4% of the patients in the TURP and control groups, respectively, after a mean follow-up of 57.6 months. CONCLUSION: LRP is feasible but challenging after TURP. LRP entails longer operating times, greater blood loss, higher complication rates and worse short-term continence outcomes. However, the radical nature of this cancer surgery is not compromised.


Subject(s)
Laparoscopy , Postoperative Complications/epidemiology , Prostatectomy/methods , Prostatic Neoplasms/surgery , Aged , Aged, 80 and over , Follow-Up Studies , Humans , Image-Guided Biopsy , Incidence , Male , Matched-Pair Analysis , Middle Aged , Prostatic Neoplasms/diagnosis , Reoperation , Republic of Korea/epidemiology , Retrospective Studies , Risk Factors , Transurethral Resection of Prostate/methods , Treatment Outcome
8.
Connect Tissue Res ; 56(6): 434-9, 2015 Nov.
Article in English | MEDLINE | ID: mdl-25943462

ABSTRACT

AIM: The aim of this study is to evaluate the capacity of polylactid acid (PLA) fibrous membrane seeded with allogeneic rabbit adipose tissue-derived stem cells (ADSCs) to repair urethral defects in a rabbit model. MATERIALS AND METHODS: Rabbit ADSCs were harvested and phenotypically characterized. Twenty-four New Zealand male rabbits with 5-mm urethral mucosal defects were randomly divided into two groups. They underwent urethroplasty either with PLA fibrous membrane seeded with ADSCs (group A) or blank PLA fibrous membrane (group B). At 4 and 6 weeks after urethroplasty, the urethral grafts were collected and analyzed grossly and histologically. The incidence rate of urethrostenosis was measured. RESULTS: The adipose tissue-derived cells in monolayer culture showed a typical morphology of mesenchymal stem cells (MSCs). They were positive for the MSC marker CD44 but negative for lineage markers CD45 and CD105. Six weeks after surgery, the incidence rate of urethrostenosis in group A was significantly lower than that in group B (p < 0.05). In group A, the ADSC-seeded grafts showed a normal urethral architecture with a thickened muscle layer. In contrast, the newly developed urethra in group B demonstrated a fewer number of urothelial layers and scarce or no smooth muscle cells. CONCLUSION: The PLA scaffold seeded with ADSCs is effective in urethral regeneration in a rabbit model. ADSCs may represent a promising source of seed cells for urethral tissue engineering.


Subject(s)
Adipose Tissue/metabolism , Membranes, Artificial , Polyesters/pharmacology , Stem Cell Transplantation , Stem Cells/metabolism , Urethra/surgery , Adipose Tissue/pathology , Allografts , Animals , Male , Rabbits , Tissue Scaffolds , Urethra/metabolism , Urethra/pathology
9.
BMC Complement Altern Med ; 13: 364, 2013 Dec 21.
Article in English | MEDLINE | ID: mdl-24359437

ABSTRACT

BACKGROUND: Pomegranate possesses many medicinal properties such as antioxidant, anti-inflammation and antitumor. It has been extensively used as a folk medicine by many cultures. Pomegranate fruit has been shown to have the inhibitory efficacy against prostate cancer and lung cancer in vitro and in vivo. It can be exploited in chemoprevention and chemotherapy of prostate cancer. In this study we examined the anti-cancer efficacy of pomegranate fruit grown in Taiwan against urinary bladder urothelial carcinoma (UBUC) and its mechanism of action. METHODS: Edible portion of Taiwanese pomegranate was extracted using ethanol and the anti-cancer effectiveness of ethanol extract was evaluated by 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide assay. Flow cytometry and western immunoblotting were exploited to uncover the molecular pathways underlying anti-UBUC activity of Taiwanese pomegranate ethanol extract. RESULTS: This study demonstrated that Taiwanese pomegranate fruit ethanol extract (PEE) could effectively restrict the proliferation of UBUC T24 and J82 cells. Cell cycle analyses indicated that the S phase arrest induced by PEE treatment might be caused by an increase in cyclin A protein level and a decrease in the expression of cyclin-dependent kinase 1. The results of western immunoblotting demonstrated that PEE treatment could not only evoke the activation of pro-caspase-3, -8,-9 but also increase Bax/Bcl-2 ratio in T24 cells. The above observations implicated that PEE administration might trigger the apoptosis in T24 cells through death receptor signaling and mitochondrial damage pathway. Besides we found that PEE exposure to T24 cells could provoke intensive activation of procaspase-12 and enhance the expressions of CHOP and Bip, endoplasmic reticulum (ER) stress marker, suggesting that ER stress might be the cardinal apoptotic mechanism of PEE-induced inhibition of bladder cancer cell. CONCLUSIONS: The analytical results of this study help to provide insight into the molecular mechanism of induced bladder cancer cell apoptosis by pomegranate and to develop novel mechanism-based chemopreventive strategy for bladder cancer.


Subject(s)
Antineoplastic Agents/pharmacology , Apoptosis/drug effects , Carcinoma/drug therapy , Cell Cycle Checkpoints/drug effects , Lythraceae/chemistry , Plant Extracts/pharmacology , Urinary Bladder Neoplasms/drug therapy , Carcinoma/pathology , Cell Line, Tumor , Cell Proliferation/drug effects , Fruit/chemistry , Humans , Urinary Bladder Neoplasms/pathology
10.
Urol Int ; 91(3): 320-5, 2013.
Article in English | MEDLINE | ID: mdl-24089026

ABSTRACT

OBJECTIVE: To compare operative time, safety and effectiveness of minimally invasive percutaneous nephrolithotomy (MPCNL) in the supine lithotomy versus prone position. METHODS: Between January 2008 and December 2010, a total of 109 consecutive patients with upper urinary tract calculi were enrolled and randomly divided into group A (53 patients, supine lithotomy position) and group B (56 patients, prone position). The MPCNL procedures were performed under the guidance of real-time grayscale ultrasound system. The preoperative characteristics, intraoperative and postoperative parameters were analyzed and compared. RESULTS: All patients were successfully operated. There was no significant difference between the two groups in stone-free rate (group A 90.1 vs. group B 87.5%, p = 0.45), mean blood loss, number of access tracts, calyx puncture, mean hospital stay (group A 6 ± 1.1 vs. group B 6 ± 1.5 days, p = 0.38) and complications. But the operative time was significantly shortened in supine lithotomy position (group A 56 ± 15 vs. group B 86 ± 23 min, p < 0.001). CONCLUSIONS: The effectiveness and safety of the supine lithotomy position for MPCNL were similar to the prone position. However, the supine lithotomy position has an important advantage of reducing the operative time. The supine lithotomy position could be a good choice to perform MPCNL.


Subject(s)
Kidney Calculi/surgery , Kidney Calices/surgery , Nephrostomy, Percutaneous/methods , Prone Position , Supine Position , Urinary Tract/surgery , Adult , Aged , Female , Humans , Male , Middle Aged , Operative Time , Postoperative Period , Reproducibility of Results , Treatment Outcome , Ultrasonography
11.
Comput Math Methods Med ; 2012: 979847, 2012.
Article in English | MEDLINE | ID: mdl-22927890

ABSTRACT

Indentation testing is a widely used approach to evaluate mechanical characteristics of soft tissues quantitatively. Young's modulus of soft tissue can be calculated from the force-deformation data with known tissue thickness and Poisson's ratio using Hayes' equation. Our group previously developed a noncontact indentation system using a water jet as a soft indenter as well as the coupling medium for the propagation of high-frequency ultrasound. The novel system has shown its ability to detect the early degeneration of articular cartilage. However, there is still lack of a quantitative method to extract the intrinsic mechanical properties of soft tissue from water jet indentation. The purpose of this study is to investigate the relationship between the loading-unloading curves and the mechanical properties of soft tissues to provide an imaging technique of tissue mechanical properties. A 3D finite element model of water jet indentation was developed with consideration of finite deformation effect. An improved Hayes' equation has been derived by introducing a new scaling factor which is dependent on Poisson's ratios v, aspect ratio a/h (the radius of the indenter/the thickness of the test tissue), and deformation ratio d/h. With this model, the Young's modulus of soft tissue can be quantitatively evaluated and imaged with the error no more than 2%.


Subject(s)
Cartilage, Articular/diagnostic imaging , Connective Tissue/diagnostic imaging , Elastic Modulus , Ultrasonics , Algorithms , Animals , Compressive Strength , Computer Simulation , Elasticity , Finite Element Analysis , Humans , Imaging, Three-Dimensional , Models, Statistical , Poisson Distribution , Stress, Mechanical , Ultrasonography , Water/chemistry
12.
Ultrasonics ; 52(2): 266-75, 2012 Feb.
Article in English | MEDLINE | ID: mdl-21925692

ABSTRACT

OBJECTIVES: This paper introduces a new graph-based method for segmenting breast tumors in US images. BACKGROUND AND MOTIVATION: Segmentation for breast tumors in ultrasound (US) images is crucial for computer-aided diagnosis system, but it has always been a difficult task due to the defects inherent in the US images, such as speckles and low contrast. METHODS: The proposed segmentation algorithm constructed a graph using improved neighborhood models. In addition, taking advantages of local statistics, a new pair-wise region comparison predicate that was insensitive to noises was proposed to determine the mergence of any two of adjacent subregions. RESULTS AND CONCLUSION: Experimental results have shown that the proposed method could improve the segmentation accuracy by 1.5-5.6% in comparison with three often used segmentation methods, and should be capable of segmenting breast tumors in US images.


Subject(s)
Ultrasonography, Mammary/methods , Algorithms , Breast Neoplasms/diagnostic imaging , Female , Humans
13.
PLoS One ; 6(10): e26053, 2011.
Article in English | MEDLINE | ID: mdl-22022505

ABSTRACT

A long and ever-expanding roster of small (∼20-30 nucleotides) RNAs has emerged during the last decade, and most can be subsumed under the three main headings of microRNAs (miRNAs), Piwi-interacting RNAs (piRNAs), and short interfering RNAs (siRNAs). Among the three categories, miRNAs is the most quickly expanded group. The most recent number of identified miRNAs is 16,772 (Sanger miRbase, April 2011). However, there are insufficient publications on their primary forms, and no tissue-specific small RNAs precursors have been reported in the epididymis. Here, we report the identification in rats of an epididymis-specific, chimeric, noncoding RNA that is spliced from two different chromosomes (chromosomes 5 and 19), which we named HongrES2. HongrES2 is a 1.6 kb mRNA-like precursor that gives rise to a new microRNA-like small RNA (mil-HongrES2) in rat epididymis. The generation of mil-HongrES2 is stimulated during epididymitis. An epididymis-specific carboxylesterase named CES7 had 100% cDNA sequence homology at the 3'end with HongrES2 and its protein product could be downregulated by HongrES2 via mil-HongrES2. This was confirmed in vivo by initiating mil-HongrES2 over-expression in rats and observing an effect on sperm capacitation.


Subject(s)
RNA, Untranslated/genetics , Sperm Maturation/genetics , Animals , Base Sequence , Clone Cells , Cloning, Molecular , Down-Regulation/genetics , Epididymis/metabolism , Gene Expression Regulation , Inflammation/genetics , Inflammation/pathology , Male , Molecular Sequence Data , Organ Specificity/genetics , RNA Precursors/genetics , RNA, Messenger/genetics , Rats , Rats, Sprague-Dawley , Real-Time Polymerase Chain Reaction , Sequence Analysis, RNA , Sperm Capacitation/genetics , Time Factors
14.
Article in English | MEDLINE | ID: mdl-19964584

ABSTRACT

The re-establishment of bone-tendon junction (BTJ) tissues is involved in many trauma and reconstructive surgeries. A direct BTJ repair requires a long period of immobilization which may be associated with a postoperative weak knee. In this study, we investigated if low-intensity pulsed ultrasound treatment increases the material properties of healing tissues at bone-tendon junction (BTJ) after partial patellectomy using rabbit models. Standard partial patellectomy was conducted on one knee of twenty four rabbits which were randomly divided into an ultrasound group and a control group. The bony changes of BTJ complexes around the BTJ healing interface were measured by anteroposterior x-ray radiographs; then the volumetric bone-mineral density (BMD) of the new bone was assessed using a peripheral computed tomography scanner (pQCT). The stiffness of patellar cartilage, fibrocartilage at the healing interface and the tendon were measured in situ using a novel noncontact ultrasound water jet indentation system. Not only significantly more newly formed bone at the BTJ healing interface but also increased stiffness of the junction tissues were found in the ultrasound group compared with the controls at week 18. In addition, the ultrasound group also showed significantly 44% higher BMD at week 6 than controls.


Subject(s)
Bone and Bones/physiology , Patella/surgery , Tendons/physiology , Ultrasonic Therapy/methods , Wound Healing/physiology , Animals , Bone and Bones/diagnostic imaging , Bone and Bones/injuries , Cartilage/diagnostic imaging , Disease Models, Animal , Female , Fibrocartilage/diagnostic imaging , Knee Joint/diagnostic imaging , Knee Joint/surgery , Patella/diagnostic imaging , Patella/injuries , Rabbits , Radiography , Tendon Injuries/diagnostic imaging , Tendon Injuries/therapy , Tendons/diagnostic imaging , Ultrasonography
15.
Ultrasound Med Biol ; 35(11): 1783-93, 2009 Nov.
Article in English | MEDLINE | ID: mdl-19766382

ABSTRACT

The re-establishment of bone-tendon junction (BTJ) tissues with the junction, characterized as a unique transitional fibrocartilage zone, is involved in many trauma and reconstructive surgeries. Experimental and clinical findings have shown that a direct BTJ repair requires a long period of immobilization, which may be associated with a postoperative weak knee. Therefore, it is necessary to evaluate the morphologic and mechanical properties of BTJ tissues in situ to better understand the healing process for the purpose of reducing the adverse effects of immobilization. We previously reported a noncontact ultrasound water jet indentation system for measuring and mapping tissue mechanical properties. The key idea was to utilize a water jet as an indenter as well as the coupling medium for high-frequency ultrasound. In this article, we used ultrasound water jet indentation to evaluate the BTJ healing process. The system's capability of measuring the material elastic modulus was first validated using tissue-mimicking phantoms. Then it was employed to assess the healing of the BTJ tissues after partial patellectomy over time on twelve 18-week-old female New Zealand White rabbits. It was found that in comparison with the normal control samples, the elastic modulus of the fibrocartilage of the postoperative samples was significantly smaller, while its thickness increased significantly. Among the postoperative sample groups, the elastic modulus of the fibrocartilage of the samples harvested at week 18 was significantly higher than those harvested at week 6 and week 12, which was even comparable with the value of the control samples at the same sacrifice time. The results suggested that the noncontact ultrasound water jet indentation system provided a nondestructive way to evaluate the material properties of small animal tissues in situ and thus had the ability to evaluate the healing process of BTJ.


Subject(s)
Bone and Bones/physiology , Elasticity Imaging Techniques/methods , Tendons/physiology , Wound Healing , Animals , Bone and Bones/diagnostic imaging , Bone and Bones/pathology , Disease Models, Animal , Elasticity , Female , Immobilization , Patellar Ligament/diagnostic imaging , Patellar Ligament/pathology , Patellar Ligament/physiology , Phantoms, Imaging , Rabbits , Tendons/diagnostic imaging , Tendons/pathology , Water
16.
IEEE Trans Biomed Eng ; 54(1): 114-21, 2007 Jan.
Article in English | MEDLINE | ID: mdl-17260862

ABSTRACT

The alteration of tissue stiffness is generally known to be associated with pathological changes. Ultrasound indentation is one of the methods that can be used to assess the mechanical properties of the soft tissues. It uses a flat-ended ultrasound transducer to directly contact the tissue to sense tissue deformation under an applied load. This paper introduced a novel noncontact ultrasound indentation system using water jet compression. The key idea was to utilize a water jet as the indenter as well as the coupling medium for propagation of the ultrasound beam. High frequency focused ultrasound (20 MHz) was used to measure the indentation deformation at a microscopic level. It has been demonstrated that the system could effectively assess the tissue-mimic phantoms with different stiffness. Water jet coupling allows the system to conduct C-scan on soft tissues rapidly and conveniently. By applying different pressures while taking C-scan sequences, the modulus images of the phantoms could be obtained based on the applied pressure and the phantom deformation and thickness. This paper presented the preliminary results on gel phantoms. The spatial resolution, the contrast resolution of the measurements and the reproducibility of the results were also discussed.


Subject(s)
Connective Tissue/diagnostic imaging , Connective Tissue/physiology , Hardness Tests/methods , Image Interpretation, Computer-Assisted/methods , Physical Stimulation/methods , Ultrasonography/methods , Elasticity , Hardness , Phantoms, Imaging , Physical Stimulation/instrumentation , Pressure , Stress, Mechanical , Ultrasonography/instrumentation , Water
17.
Ultrasonics ; 44 Suppl 1: e203-9, 2006 Dec 22.
Article in English | MEDLINE | ID: mdl-16842834

ABSTRACT

Research in elasticity imaging typically relies on 1-10 MHz ultrasound. Elasticity imaging at these frequencies can provide strain maps with a resolution in the order of millimeters, but this is not sufficient for applications to skin, articular cartilage, or other fine structures. In this paper, we introduced two methods of ultrasound elastomicroscopy using water jet and osmosis loading for imaging the elasticity of biological soft tissues with high resolutions. In the first system, the specimens were compressed using water jet compression. A water jet was used to couple a focused 20 MHz ultrasound beam into the specimen and meanwhile served as a "soft" indenter. Because there was no additional attenuation when propagating from the ultrasound transducer to the specimen, the ultrasound signal with high signal-to-noise ratio could be collected from the specimens simultaneously with compressing process. The compression was achieved by adjusting the water flow. The pressure measured inside the water pipe and that on the specimen surface was calibrated. This system was easily to apply C-scan over sample surfaces. Experiments on the phantoms showed that this water jet indentation method was reliable to map the tissue stiffness distribution. Results of 1D and 2D scanning on phantoms with different stiffness are reported. In the second system, we used osmotic pressure caused by the ion concentration change in the bathing solutions for the articular cartilage to deform them. When bovine articular cartilage specimens were immerged in solutions with different salt concentration, a 50 MHz focused ultrasound beam was used to monitor the dynamic swelling or shrinkage process. Results showed that the system could reliably map the strain distribution induced by the osmotic loading. We extract intrinsic layered material parameters of the articular cartilage using a triphasic model. In addition to biological tissues, these systems have potential applications for the assessment of bioengineered tissues, biomaterials with fine structures, or some engineering materials. Further studies are necessary to fully realize the potentials of these two new methods.


Subject(s)
Cartilage, Articular/diagnostic imaging , Cartilage, Articular/physiology , Image Enhancement/methods , Image Interpretation, Computer-Assisted/methods , Microscopy, Acoustic/methods , Models, Biological , Water , Algorithms , Animals , Cattle , Computer Simulation , Elasticity , Feasibility Studies , Imaging, Three-Dimensional/methods , Microscopy, Acoustic/instrumentation , Osmosis , Phantoms, Imaging , Reproducibility of Results , Sensitivity and Specificity , Stress, Mechanical
18.
Ultrasound Med Biol ; 31(12): 1607-15, 2005 Dec.
Article in English | MEDLINE | ID: mdl-16344123

ABSTRACT

In this study, we developed a new method to perform 3-D measurements between the recorded B-scans using the corresponding spatial location and orientation of each B-scan, without the need to create a 3-D volume. A portable ultrasound (US) scanner and an electromagnetic spatial locator attached to the US probe were used. During data collection, the US probe was moved over the region-of-interest. A small number of B-scans containing interesting anatomical information were captured from different body parts and displayed in a 3-D space with their corresponding locations recorded by the spatial locator. In the B-scan planes, the distance between any two points, as well as the angle between any two lines, could be calculated. In validation experiments, three distances and three angles of a custom-designed phantom were measured using this method. In comparison with the results measured by a micrometer, the mean error of distance measurement was -0.8 +/- 1.7 mm (-2.3 +/- 3.6%) and that of angle measurement was -0.3 +/- 2.9 degrees (-0.1 +/- 4.1%). The lengths of the first metatarsals and the angles between the first metatarsals and the middle part of the tibias of three subjects were measured in vivo using magnetic resonance imaging (MRI) and the US method by two operators before and after MRI scanning. The overall percentage differences of the length and angle measurements were 0.8 +/- 2.2% and 2.5 +/- 3.6%, respectively. The results showed that this US method had good repeatability and reproducibility (interclass correlation coefficient values > 0.75). We expect that this new method could potentially provide a quick and effective approach for the 3-D measurement of soft tissues and bones in the musculoskeletal system.


Subject(s)
Imaging, Three-Dimensional/methods , Ultrasonography/methods , Calibration , Humans , Imaging, Three-Dimensional/instrumentation , Leg/diagnostic imaging , Musculoskeletal System/diagnostic imaging , Research Design , Ultrasonography/instrumentation
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