Paget's sarcoma of the patella.

Paget's sarcoma is a rare complication of Paget's disease and isolated Paget's disease of the patella is extremely rare. We describe a unique case of Paget's sarcoma of the patella in a 69-year-old male farmer who had a remote history of a fracture in the same patella 40 years previously. In this case, imaging and pathogenesis of Paget's disease of bone is described and factors implicated in the development of Paget's disease in this patient are evaluated.

Risk stratifying individuals with zero, minimal, and mild coronary artery calcium for cardiovascular disease by determining coronary plaque burden.

BACKGROUND AND AIMS: Use of coronary artery calcium (CAC) continues to expand, and several different categories of risk have been developed. Some categorize CAC as <10, 11-100 and â€‹> â€‹100, while others use CAC â€‹= â€‹0,1-10, 11-100 and â€‹> â€‹100 as categories. We sought to evaluate the plaque burden in patients with CAC 0, 1-10 and 11-100 to evaluate the best use of CAC scoring for risk assessment. METHODS: Patients were recruited from existing prospective CCTA trials with CAC scores ≤100 and quantitative coronary plaque analysis (QAngio, Medis). CAC was categorized into three groups: zero (CAC â€‹= â€‹0), minimal (CAC 1-10), and mild (CAC 11-100). Plaque levels (low attenuated, fibrous, fibro-fatty, dense calcified, total non-calcified) were assessed using multivariable linear regression adjusted for cardiovascular risk factors (age, ethnicity, BMI, gender, hypertension, dyslipidemia, diabetes mellitus, past smoking). RESULTS: 378 subjects were included, with an average age of 53.9 â€‹± â€‹10.7 years and 53 â€‹% female. Among them, 51 â€‹% had 0 CAC, 16 â€‹% had minimal CAC (scores 1-10), and 33 â€‹% had mild CAC (scores 11-100). The minimal and mild CAC groups were significantly older, with higher rates of diabetes, hypertension, and hyperlipidemia. Multivariable analysis found no significant difference in low attenuated, fibro-fatty, and dense calcified plaque levels between the minimal and zero CAC groups. However, minimal CAC subjects had significantly higher fibrous, total non-calcified, and total plaque volumes than zero CAC. All plaque types were significantly higher in the mild group when comparing mild CAC to minimal CAC. CONCLUSION: Individuals with minimal calcium scores (1-10) had greater noncalcified coronary plaque (NCAP) and total plaque volume than individuals with a calcium score of zero. The increased presence of NCAP and total plaque volume in the minimal CAC (1-10) is clinically significant and place those patients at higher coronary vascular disease (CVD) risk than individuals with absent CAC (CAC â€‹= â€‹zero). Therefore, the use of CAC â€‹= â€‹0, 1-10 and 11-100 is prudent to better categorize CVD risk.

Grading the severity of the rotator cuff tendinosis on MRI: Assessment of inter-observer agreement and evaluation of a novel objective assessment tool.

INTRODUCTION: MRI is generally considered the modality of choice for the assessment of rotator cuff pathology including tendinosis. Assessment of severity is currently subjective primarily based on tendon morphology and signal intensity. Limited data are available evaluating the inter-observer agreement regarding the assessment of tendinosis severity. METHODS: One hundred and twenty-four patients were prospectively enrolled in the study. Patients included were referred to two private radiology practices for shoulder MRI for any reason. Two musculoskeletal radiologists assessed the severity of tendinosis independently. Supraspinatus tendon signal was evaluated with a ROI and compared to the adjacent deltoid muscle signal, generating a ratio of tendon: muscle signal, termed the 'objective TM ratio'. The relationship between the subjective assessment of tendinosis severity and objective ratio was examined. Inter-observer agreement was also calculated. RESULTS: Tendinosis severity was graded as normal in 36 and 11 patients by readers 1 and 2, respectively, mild in 45 and 48 patients, moderate in 26 and 48 patients and severe in 10 and 10 patients. Inter-observer agreement is classified as fair (0.31 kappa co-efficient). Mean objective TM ratio increased on both the PD and TS F2 sequences as the subjective grade of tendinosis severity increased. CONCLUSION: A novel means of evaluating rotator cuff tendinosis severity is presented, demonstrated to correlate with the subjective grade of tendinosis severity. Further research is required to assess the utility of such objective measurements across varying imaging protocols whilst understanding the inherent limitations with quantifying signal intensity on MRI.

Assessment of anterior loop of mandibular canal and its implication in implant therapy.

Context: Precise identification of anatomic structures is imperative for presurgical planning for implant installation to ensure effectiveness of procedures, especially in the region of mental foramen, and to prevent iatrogenic complications. Aims: This study aimed to assess the presence of anterior loop of mandibular canal and its approximation to the alveolar crest using cone-beam computed tomography (CBCT). Materials and Methods: CBCT scans of the patients scheduled for implant therapy in the region of mental foramen were retrospectively analyzed for the presence of anterior loop of mandibular canal. Findings were compared based upon gender and side of the mandible. Distance between the most prominent part of anterior loop of mandibular canal and the alveolar crest was measured. Results: Anterior loop of the mandibular canal was identified 66.8% of hemimandibles analyzed with the highest prevalence in the fourth decade of life. Males and females exhibited predilection toward the right and left side, respectively. The presence of anterior loop of mandibular canal is associated with reduced distance between the neurovascular bundle and alveolar crest jeopardizing the placement of standard length dental implant. Conclusion: The current study emphasizes an increased need for precise identification and preservation of anterior loop of mandibular canal in the third and fourth decades of life, especially in females.

Eosinophilic Fasciitis With a Malignant Outcome.

Eosinophilic fasciitis (EF) is an uncommon localized fibrosing disorder affecting the fascial layers of the human body. To date less than 300 cases of EF have been reported worldwide. Due to the limited prevalence, extensive studying of its pathogenesis and treatment has not yet been established. Furthermore, little is known regarding the long-term prognosis and comorbidities associated with EF. In this case study, we discuss a 72-year-old female patient who was diagnosed with EF and subsequently developed squamous cell carcinoma (SCC) of the skin in areas of previously exposed EF. This case represents the first reported case of SCC of the skin in a patient with previously active EF in the same area of skin.

Utilization of 810 nm Diode Laser Treatment in Periodontitis as an Alternative to Surgical Debridement Approach.

The efficacy of surgical periodontal may be compromised by inadequate patients' self-performed plaque control or lack of supportive periodontal therapy. This clinical case report aimed to evaluate the effectiveness of 810 nm diode laser-assisted full-mouth sulcular debridement, as a potential treatment modality in the management of chronic periodontitis along with a 12-month follow-up evaluation. Each periodontal pocket was lased within 2 mm of deepest point, using a light contact of "hot tip" of the fiber with tissue [Average power-1W, emission mode-continuous wave, in "contact", beam diameter-400 µm, spot area at tissue-0.0013 cm2 , fluence-124.9 J cm-2 , power density-796 W cm-2 , total energy-300 J, total treatment duration-300 s (5 min)]. The patient was followed up to 12 months and did not report any immediate or delayed complications such as any sign of photothermal damage, pain, tissue swelling and deformation, bleeding and infection. 810 nm diode laser-assisted sulcular debridement at low-power settings showed overall clinical and radiographic improvements and can be deemed as a potential alternative to surgical debridement approach, in persistent moderate periodontal pockets (4-6 mm).

High throughput X-ray diffraction analysis of combinatorial polycrystalline thin film libraries.

With the increasing demand for new materials, analytical techniques which are able to rapidly characterize a large number of samples are becoming indispensable. Thin film technology has the potential to improve the amount of information contained on as-deposited samples by creating compositionally graded libraries. Conventionally, raster scan methods are used to interrogate such libraries but, in this paper, a different approach is presented to provide a method of high-throughput data collection and analysis using an X-ray diffraction (XRD) probe. An extended X-ray beam was used to illuminate the libraries, and a large area detector was used to collect the data. A new algorithm "Bandit" has been employed to analyze the collected data and extract the crystallographic information. The results of the technique have been compared with the raster scans showing that the algorithm provides reliable data at a significantly increased data acquisition speed.

Evaluation of effectiveness of connective tissue graft as a barrier with bioresorbable collagen membrane in the treatment of mandibular Class II furcation defects in humans: 4-year clinical results.

OBJECTIVE: Connective tissue grafts (CTGs) have been used as a barrier for closing mandibular Class II furcation defects. The present study compared long-term (48 months) effectiveness of CTG as a barrier with bioresorbable collagen membrane in the treatment of mandibular Class II furcation defects in humans. METHOD AND MATERIALS: Twenty chronic periodontitis patients with a single Class II furcation defect on the buccal surface of mandibular teeth were included in the study. Vertical probing pocket depth (V-PPD), vertical relative attachment level (V-RAL), and relative gingival margin level (RGML) were recorded at baseline, 6 months, 12 months, and 48 months post-surgery. RESULTS: The mean V-PPD reductions observed in the test group and control group were statistically significant at all time intervals when compared with the baseline. Similarly, the mean V-RAL gain at 6 months, 12 months, and 48 months were statistically significant, compared with the baseline data in both the groups. At 48 months the difference in V-RAL gain between the groups was found to be statistically significant, with greater improvements in test group. Complete closure of furcation and improvement in horizontal classification were better in the test group than in the control group. CONCLUSION: It can be concluded that both treatment modalities result in improvement in clinical parameters. However, the results obtained with CTG appeared to be more stable.

Therapeutic Efficacy of Subgingivally Delivered Doxycycline Hyclate as an Adjunct to Non-surgical Treatment of Chronic Periodontitis.

OBJECTIVES: Locally used doxycycline has been shown to concentrate in crevicular fluid and demonstrates a wide spectrum of activity against the periodontal pathogens. The aim of the present clinical study was to evaluate the efficacy of doxycyline hyclate 10% as an adjunct to scaling and root planing in the treatment of chronic periodontitis. MATERIAL AND METHODS: 60 systemically healthy, chronic periodontitis patients were included in the study. Randomized clinical trial was performed over the 6 month period. Test group was treated by scaling and root planing followed by local delivery of doxycycline hyclate 10%, while the control group was treated by scaling and root planing along with placebo. RESULTS: Significantly greater (P < 0.001) reduction in the mean probing pocket depth was demonstrated in the test group (3.03 ± 0.92 mm) when compared with the control group (2.3 ± 0.65 mm). When the differences in clinical attachment level gain for the test group (2.0 ± 0.64 mm) versus control group (1.13 ± 1.07 mm) were analyzed by Student's unpaired t-test, test group showed statistically greater clinical attachment level gain (0.87 ± 0.22 mm, P < 0.001). CONCLUSIONS: From the analysis of the results it can be concluded that the use of doxycyline hyclate 10% as an adjunct to scaling and root planing provides more favourable and statistically significant (P < 0.001) reductions in probing pocket depth and gains in clinical attachment level compared to scaling and root planing alone.

Periodontitis as a potential risk factor for chronic obstructive pulmonary disease: a retrospective study.

AIMS AND OBJECTIVES: A relationship between poor periodontal health and respiratory disease has been suggested by a number of recent studies. The present study was undertaken to evaluate potential association between respiratory diseases and periodontal health status and to co-relate the severity of periodontal disease with that of chronic obstructive pulmonary disease (COPD). MATERIALS AND METHODS: 150 patients of COPD (test group) and 50 Patients without COPD (control group) were recruited for the study. Information regarding patient's demographic and socioeconomic status and lifestyle (history of smoking) were considered in the study. Patients with COPD were grouped into mild, moderate and severe category on the basis of Spirometry. Periodontal health was assessed by measuring probing pocket depth, Clinical Attachment Loss (CAL) and Oral Hygiene Index (OHI). RESULTS: The results showed that the subjects with COPD had significantly more mean CAL) and a higher mean OHI than those without COPD. The risk for COPD appeared to be significantly elevated when attachment loss was found to be severe. A trend was noted in that lung function appeared to diminish as the amount of attachment loss increased. CONCLUSION: On the basis of the observed results of the study it can be concluded that the risk for COPD appeared to be significantly elevated when attachment loss was found to be severe. It is conceivable that oral interventions that improve oral health status may prove to lower the severity of lung infection in susceptible populations.

On mathematical modelling of insect flight dynamics in the context of micro air vehicles.

We discuss some aspects of mathematical modelling relevant to the dynamics of insect flight in the context of insect-like flapping-wing micro air vehicles (MAVs). MAVs are small flying vehicles developed to reconnoître in confined spaces. This requires power-efficient, highly-manoeuvrable, low-speed flight with stable hover. All of these attributes are present in insect flight and hence the focus on reproducing the functionality of insect flight by engineering means. Empirical research on insect flight dynamics is limited by experimental difficulties. Force and moment measurements require tethering the animal whose behaviour may then differ from free flight. The measurements are made when the insect actively tries to control its flight, so that its open-loop dynamics cannot be observed. Finally, investigation of the sensory-motor system responsible for flight is even more challenging. Despite these difficulties, much empirical progress has been made recently. Further progress, especially in the context of MAVs, can be achieved by the complementary information derived from appropriate mathematical modelling. The focus here is on a means of computing the data not easily available from experiments and also on making mathematical predictions to suggest new experiments. We consider two aspects of mathematical modelling for insect flight dynamics. The first one is theoretical (computational), as opposed to empirical, generation of the aerodynamic data required for the six-degrees-of-freedom equations of motion. For this purpose we first explain insect wing kinematics and the salient features of the corresponding flow. In this context, we show that aerodynamic modelling is a feasible option for certain flight regimes, focusing on a successful example of modelling hover. Such modelling progresses from the first principles of fluid mechanics, but relies on simplifications justified by the known flow phenomenology and/or geometric and kinematic symmetries. This is relevant to six types of fundamental manoeuvres, which we define as those flight conditions for which only one component of the translational and rotational body velocities is nonzero and constant. The second aspect of mathematical modelling for insect flight dynamics addressed here deals with the periodic character of the aerodynamic force and moment production. This leads to consideration of the types of solutions of nonlinear equations forced by nonlinear oscillations. In particular, the mechanism of synchronization seems relevant and should be investigated further.