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Bujnowski K, Getgood A, Leitch K, Farr J, Dunning C, Burkhart TA. A pilot hole does not reduce the strains or risk of fracture to the lateral cortex during and following a medial opening wedge high tibial osteotomy in cadaveric specimens. Bone Joint Res 2018; 7:166-172. [PMID: 29682282 PMCID: PMC5895948 DOI: 10.1302/2046-3758.72.bjr-2017-0337.r1] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
Aim It has been suggested that the use of a pilot-hole may reduce the risk of fracture to the lateral cortex. Therefore the purpose of this study was to determine the effect of a pilot hole on the strains and occurrence of fractures at the lateral cortex during the opening of a high tibial osteotomy (HTO) and post-surgery loading. Materials and Methods A total of 14 cadaveric tibias were randomized to either a pilot hole (n = 7) or a no-hole (n = 7) condition. Lateral cortex strains were measured while the osteotomy was opened 9 mm and secured in place with a locking plate. The tibias were then subjected to an initial 800 N load that increased by 200 N every 5000 cycles, until failure or a maximum load of 2500 N. Results There was no significant difference in the strains on the lateral cortex during HTO opening between the pilot hole and no-hole conditions. Similarly, the lateral cortex and fixation plate strains were not significantly different during cyclic loading between the two conditions. Using a pilot hole did not significantly decrease the strains experienced at the lateral cortex, nor did it reduce the risk of fracture. Conclusions The nonsignificant differences found here most likely occurred because the pilot hole merely translated the stress concentration laterally to a parallel point on the surface of the hole. Cite this article: K. Bujnowski, A. Getgood, K. Leitch, J. Farr, C. Dunning, T. A. Burkhart. A pilot hole does not reduce the strains or risk of fracture to the lateral cortex during and following a medial opening wedge high tibial osteotomy in cadaveric specimens. Bone Joint Res 2018;7:166–172. DOI: 10.1302/2046-3758.72.BJR-2017-0337.R1.
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Affiliation(s)
- K Bujnowski
- Department of Mechanical and Materials Engineering, Western University Faculty of Engineering, London, Ontario, Canada
| | - A Getgood
- Surgery Department, University of Western Ontario, London, Ontario, Canada
| | - K Leitch
- Department of Physiology and Pharmacology, Western University, London, Ontario, Canada
| | - J Farr
- Orthoindy South, Greenwood, Indiana, USA
| | - C Dunning
- Department of Mechanical and Materials Engineering, Western University Faculty of Engineering, London, Ontario, Canada
| | - T A Burkhart
- Department of Mechanical and Materials Engineering, Western University Faculty of Engineering, London, Ontario, Canada
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Abstract
PURPOSE Progressive hip displacement is one of the most common orthopaedic pathologies in children with cerebral palsy (CP). Reconstructive hip surgery has become the standard treatment of care. Reported avascular necrosis (AVN) rates for hip reconstructive surgery in these patients vary widely in the literature. The purpose of this study is to identify the frequency and associated risk factors of AVN for reconstructive hip procedures. METHODS A retrospective analysis was performed of 70 cases of reconstructive hip surgery in 47 children with CP, between 2009 and 2013. All 70 cases involved varus derotation osteotomy (VDRO), with 60% having combined VDRO and pelvic osteotomies (PO), and 21% requiring open reductions. Mean age at time of surgery was 8.82 years and 90% of patients were Gross Motor Function Classification System (GMFCS) 4 and 5. Radiographic dysplasia parameters were analysed at selected intervals, to a minimum of one year post-operatively. Severity of AVN was classified by Kruczynski's method. Bivar- iate statistical analysis was conducted using Chi-square test and Student's t-test. RESULTS There were 19 (27%) noted cases of AVN, all radio- graphically identifiable within the first post-operative year. The majority of AVN cases (63%) were mild to moderate in severity. Pre-operative migration percentage (MP) (p = 0.0009) and post-operative change in MP (p = 0.002) were the most significant predictors of AVN. Other risk factors were: GMFCS level (p = 0.031), post-operative change in NSA (p = 0.02) and concomitant adductor tenotomy (0.028). CONCLUSION AVN was observed in 27% of patients. Severity of displacement correlates directly with AVN risk and we suggest that hip reconstruction, specifically VDRO, be performed early in the 'hip at risk' group to avoid this complication.
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Affiliation(s)
- L. Phillips
- Department of Orthopaedic Surgery, BC Children's Hospital, Vancouver, BC, Canada
| | - K. Hesketh
- Department of Orthopaedic Surgery, BC Children's Hospital, Vancouver, BC, Canada
| | - E. K. Schaeffer
- Department of Orthopaedic Surgery, BC Children's Hospital, Vancouver, BC, Canada,Department of Orthopaedics, University of British Columbia and Department of Orthopaedic Surgery, BC Children's Hospital, Vancouver, BC, Canada
| | - J. Andrade
- Department of Orthopaedic Surgery, BC Children's Hospital, Vancouver, BC, Canada
| | - J. Farr
- Department of Orthopaedic Surgery, BC Children's Hospital, Vancouver, BC, Canada
| | - K. Mulpuri
- Department of Orthopaedic Surgery, BC Children's Hospital, Vancouver, BC, Canada,Department of Orthopaedics, University of British Columbia and Department of Orthopaedic Surgery, BC Children's Hospital, Vancouver, BC, Canada,Correspondence should be sent to: Dr K. Mulpuri, Department of Orthopaedic Surgery, BC Children’s Hospital, 1D66-4480 Oak Street, Vancouver, BC, Canada.
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Maurel DB, Duan P, Farr J, Cheng AL, Johnson ML, Bonewald LF. Beta-Catenin Haplo Insufficient Male Mice Do Not Lose Bone in Response to Hindlimb Unloading. PLoS One 2016; 11:e0158381. [PMID: 27410430 PMCID: PMC4943721 DOI: 10.1371/journal.pone.0158381] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2016] [Accepted: 06/15/2016] [Indexed: 11/19/2022] Open
Abstract
As the β-catenin pathway has been shown to be involved in mechanotransduction, we sought to determine if haploinsufficiency would affect skeletal response to unloading. It has previously been shown that deletion of both alleles of β-catenin in bone cells results in a fragile skeleton highly susceptible to fracture, but deletion of one allele using Dmp1-Cre (Ctnnb1+/loxP; Dmp1-Cre, cKO HET) has little effect on the 2 mo old skeleton. We found that under normal housing conditions, trabecular bone volume was significantly less in 5 mo old male cKO HET mice compared to controls (Ctrl/HET:Tb. BV/TV = 13.96±2.71/8.92±0.95%, Tb.N. = 4.88±0.51/3.95±0.44/mm, Tb. Sp. = 0.20±0.02/0.26±0.03mm, a 36%, 19% and 30% change respectively) but not in females suggesting an age and gender related effect. Before performing suspension experiments and to control for the environmental effects, animals with the same tail attachment and housing conditions, but not suspended (NS), were compared to normally housed (NH) animals. Attachment and housing resulted in weight loss in both genders and phenotypes. Cortical bone loss was observed in the cKO HET males (NH/NS, Ct BV/TV: 90.45±0.72/89.12±0.56%) and both diaphyseal (0.19±0.01/0.17±0.01mm) and metaphyseal (0.10±0.01/0.08±0.01mm) thickness, but not in female cKO HET mice suggesting that male cKO HET mice are susceptible to attachment and housing conditions. These results with transgenic mice emphasizes the importance of proper controls when attributing skeletal responses to unloading. With suspension, cKO HET male mice did not lose bone unlike female cKO HET mice that had greater trabecular bone loss than controls (Ctrl 9%:cKO HET 21% decrease Tb. N; Ctrl 12%:cKO HET 27% increase Tb. Sp.). Suspended and non-suspended mice lost weight compared to normally housed animals. Taken together, the data suggest a protective effect of β-catenin against the effects of stress in males and partial protection against unloading in females.
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Affiliation(s)
- Delphine B. Maurel
- Department of Oral and Craniofacial Sciences, School of Dentistry, University of Missouri-Kansas City, Kansas City, MO, United States of America
| | - Peipei Duan
- Department of Oral and Craniofacial Sciences, School of Dentistry, University of Missouri-Kansas City, Kansas City, MO, United States of America
| | - Joshua Farr
- Department of Oral and Craniofacial Sciences, School of Dentistry, University of Missouri-Kansas City, Kansas City, MO, United States of America
| | - An-Lin Cheng
- School of Nursing and Health Studies, University of Missouri-Kansas City, Kansas City, MO, United States of America
| | - Mark L. Johnson
- Department of Oral and Craniofacial Sciences, School of Dentistry, University of Missouri-Kansas City, Kansas City, MO, United States of America
| | - Lynda F. Bonewald
- Department of Oral and Craniofacial Sciences, School of Dentistry, University of Missouri-Kansas City, Kansas City, MO, United States of America
- * E-mail:
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Moskvin V, Pirlepesov F, Tsiamas P, Axente M, Lukose R, Zhao L, Shin J, Farr J. SU-F-T-156: Monte Carlo Simulation Using TOPAS for Synchrotron Based Proton Discrete Spot Scanning System. Med Phys 2016. [DOI: 10.1118/1.4956292] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Moskvin V, Pirlepesov F, Stewart R, Farr J. MO-FG-CAMPUS-TeP3-05: Limitations of the Dose Weighted LET Concept for Intensity Modulated Proton Therapy in the Distal Falloff Region and Beyond. Med Phys 2016. [DOI: 10.1118/1.4957385] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Mukherjee S, Farr J, Merchant T, Yao W. SU-F-I-09: Improvement of Image Registration Using Total-Variation Based Noise Reduction Algorithms for Low-Dose CBCT. Med Phys 2016. [DOI: 10.1118/1.4955837] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Hua C, Yao W, Kidani T, Farr J, Tomida K, Ozawa S, Nishimura T, Fujusawa T, Shinagawa R, Merchant T. TU-FG-BRB-11: Design and Evaluation of a Robotic C-Arm CBCT System for Image-Guided Proton Therapy. Med Phys 2016. [DOI: 10.1118/1.4957551] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Yao W, Hua C, Farr J, Brady S, Merchant T. SU-F-J-205: Effect of Cone Beam Factor On Cone Beam CT Number Accuracy. Med Phys 2016. [DOI: 10.1118/1.4956113] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Tuomanen S, Moskvin V, Farr J. SU-F-T-144: Analytical Closed Form Approximation for Carbon Ion Bragg Curves in Water. Med Phys 2016. [DOI: 10.1118/1.4956280] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Arjomandy B, Klein E, Taylor P, Ainsley C, Safai S, Sahoo N, Pankuch M, Park S, Farr J, Kase Y, Flanz J, Yorke E, Followill D. SU-E-T-649: Quality Assurances for Proton Therapy Delivery Equipment. Med Phys 2015. [DOI: 10.1118/1.4925012] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Moskvin V, Stewart R, Tsiamas P, Axente M, Farr J. TU-EF-304-10: Efficient Multiscale Simulation of the Proton Relative Biological Effectiveness (RBE) for DNA Double Strand Break (DSB) Induction and Bio-Effective Dose in the FLUKA Monte Carlo Radiation Transport Code. Med Phys 2015. [DOI: 10.1118/1.4925665] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Tsiamas P, Moskvin V, Shin J, Axente M, Pirlepesov F, Krasin M, Merchant T, Farr J. SU-D-304-04: Pre-Clinical Feasibility Study for Intensity Modulated Grid Proton Therapy (IMgPT) Using a Newly Developed Delivery System. Med Phys 2015. [DOI: 10.1118/1.4923863] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Gray J, Lukose R, Bronson J, Chandler B, Merchant T, Farr J. MO-D-213-02: Quality Improvement Through a Failure Mode and Effects Analysis of Pediatric External Beam Radiotherapy. Med Phys 2015. [DOI: 10.1118/1.4925318] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Yao W, Farr J. SU-F-BRD-09: A Random Walk Model Algorithm for Proton Dose Calculation. Med Phys 2015. [DOI: 10.1118/1.4925188] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Axente M, Moskvin V, Shin J, Tsiamas P, Merchant T, Farr J. SU-E-T-704: Skin Dose in Proton Pencil Beam Scanning for Pediatric Patients. Med Phys 2015. [DOI: 10.1118/1.4925068] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Yao W, Farr J. Approach to Obtaining Optimal Combination of MLC Transmission Ratio and Dynamical Leaf Gap for IMRT/VMAT Dose Calculation in TPS. Int J Radiat Oncol Biol Phys 2014. [DOI: 10.1016/j.ijrobp.2014.05.2525] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Shin J, Faddegon B, Coss D, McMurry J, Farr J. SU-E-T-531: Performance Evaluation of Multithreaded Geant4 for Proton Therapy Dose Calculations in a High Performance Computing Facility. Med Phys 2014. [DOI: 10.1118/1.4888865] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Yao W, Farr J. SU-F-18C-15: Model-Based Multiscale Noise Reduction On Low Dose Cone Beam Projection. Med Phys 2014. [DOI: 10.1118/1.4889100] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Gray J, Ekwelundu E, Yao W, Farr J. SU-E-T-218: Investigating the Differences in Out-Of-Field Dose Between An Inherently Uniform Beam and a Flattening Filter Free Beam Made Uniform Through Inverse Modulation. Med Phys 2014. [DOI: 10.1118/1.4888548] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Hunter L, Farr J, Miller V. Associations of plasma osteocalcin and fetuin‐A with bone mineral density in post‐menopausal women (867.16). FASEB J 2014. [DOI: 10.1096/fasebj.28.1_supplement.867.16] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
| | - Joshua Farr
- Endocrinology Mayo ClinicRochesterMNUnited States
| | - Virginia Miller
- Surgery, Physiology & Biophysics Mayo ClinicRochesterMNUnited States
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Bishop N, Arundel P, Clark E, Dimitri P, Farr J, Jones G, Makitie O, Munns CF, Shaw N. Fracture prediction and the definition of osteoporosis in children and adolescents: the ISCD 2013 Pediatric Official Positions. J Clin Densitom 2014; 17:275-80. [PMID: 24631254 DOI: 10.1016/j.jocd.2014.01.004] [Citation(s) in RCA: 168] [Impact Index Per Article: 16.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/07/2014] [Accepted: 01/08/2014] [Indexed: 12/30/2022]
Abstract
The ISCD 2007 Pediatric Official Positions define osteoporosis in children on the basis of fracture history and low bone density, adjusted as appropriate for age, gender, and body size. The task force on fracture prediction and osteoporosis definition has reviewed these positions and suggests modifications with respect to vertebral fracture and the definition of a significant fracture history and draws attention to the need to consider degree of trauma as a factor that may modify fracture risk prediction.
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Affiliation(s)
- Nick Bishop
- Department of Human Metabolism, Academic Unit of Child Health, University of Sheffield, Sheffield, UK; Sheffield Children's Hospital, Sheffield, UK.
| | - Paul Arundel
- Department of Human Metabolism, Academic Unit of Child Health, University of Sheffield, Sheffield, UK; Sheffield Children's Hospital, Sheffield, UK
| | - Emma Clark
- Academic Rheumatology, Musculoskeletal Unit, University of Bristol, Bristol, UK
| | - Paul Dimitri
- Department of Human Metabolism, Academic Unit of Child Health, University of Sheffield, Sheffield, UK; Sheffield Children's Hospital, Sheffield, UK
| | - Joshua Farr
- College of Medicine, Mayo Clinic, Rochester, MN, USA
| | - Graeme Jones
- Musculoskeletal Unit, Menzies Research Institute, Hobart, Australia
| | - Outi Makitie
- Pediatric Endocrinology and Metabolic Bone Diseases, Helsinki University Central Hospital and University of Helsinki, Helsinki, Finland
| | - Craig F Munns
- Bone and Mineral Medicine, The Children's Hospital at Westmead, Sydney, NSW, Australia
| | - Nick Shaw
- Department of Endocrinology and Diabetes, Birmingham Children's Hospital, Birmingham, UK
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Farr J, Dessy F, DeWilde O, Bietzer O, Schoenenberg D, Stuschke M. SU-E-T-405: Basic Performance Comparison Between Two Types of Proton Beam Modulated Scanning Systems. Med Phys 2013. [DOI: 10.1118/1.4814839] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Gray J, Ekwelundu E, Farr J. SU-E-T-704: Differences Between 7MV-Flattening Filter Free and 6MV-Flat Intensity Modulated Radiotherapy Plans at Different Fractionation and Dose Rates. Med Phys 2013. [DOI: 10.1118/1.4815131] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Mukherjee B, Hentschel R, Lambert J, Farr J. 32 MEASUREMENT OF PARASITIC NEUTRON FIELD IN THE TREATMENT ENVIRONMENT OF A VARIAN CLINAC 2100 MEDICAL LINAC USING SUPERHEATED BUBBLE DETECTORS. Radiother Oncol 2012. [DOI: 10.1016/s0167-8140(12)70019-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Mukherjee B, Lambert J, Hentschel R, Farr J. 31 CONCEPTS OF A NOVEL TWIN-TLD TECHNIQUE FOR QUENCH CORRECTION RELEVANT TO HADRON THERAPY. Radiother Oncol 2012. [DOI: 10.1016/s0167-8140(12)70018-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Hentschel R, Mukherjee B, Lambert J, Deya W, Farr J. Online neutron fluence measurement at University Hospital Essen neutron therapy facility using gallium arsenide LEDs. RADIAT MEAS 2011. [DOI: 10.1016/j.radmeas.2011.05.062] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Farr J, Dessy F, Schoenenberg D, Claereboudt Y, Bietzer O, De Wilde O. TH-C-BRB-12: Fundamental Technical Performance Acceptance Testing Results of a Commercial High Definition Discrete Pencil Beam Scanning System. Med Phys 2011. [DOI: 10.1118/1.3613517] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Gomoll AH, Farr J, Gillogly SD, Kercher J, Minas T. Surgical management of articular cartilage defects of the knee. J Bone Joint Surg Am 2010; 92:2470-90. [PMID: 20962200] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Affiliation(s)
- A H Gomoll
- Cartilage Repair Center, Brigham and Women's Hospital, 75 Francis Street, Boston, MA 02115, USA.
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Farr J, Mertens T, Bäumer C, Mukherjee B, Marchand B, Stuschke M. TH-C-BRB-09: Design and Initial Performance of a Large Cross-Section Multi-Element Ionization Chamber System for Water Equivalent Range Measurements of Pristine Proton Fields. Med Phys 2010. [DOI: 10.1118/1.3469493] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Qamhiyeh S, Stuschke M, Geismar D, Kaiser A, Abu-Jawad J, Farr J. SU-FF-T-93: Assessment of Dose Conformality and the Effects of Inter- and Intra-Fraction Motion On the Dose Distribution Intensity Modulated Proton Radiotherapy for Locally Advanced Prostate Cancer: A Treatment Planning Study. Med Phys 2009. [DOI: 10.1118/1.3181566] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Farr J, Geismar D, Kaiser A, Stuschke M. SU-FF-T-660: Treatment Quality Sensitivity to Varying Beam Spot Size and Number of Fields in Intensity Modulated Proton Therapy. Med Phys 2009. [DOI: 10.1118/1.3182158] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Michaliszyn SF, Cussler E, Farr J, Blew R, Lee V, Going S. Associations Between Body Composition And Measures Of Physical Activity. Med Sci Sports Exerc 2009. [DOI: 10.1249/01.mss.0000354598.79925.d3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Zhao L, Sandison G, Farr J, Zamenhof R, Fitzek M. Measurement of Initial Respiration Phase Effect on Simulated Lung Cancer Treatment: A Comparison between a Proton Beam Passive Scattering Delivery System and a Uniform Scanning Delivery System. Int J Radiat Oncol Biol Phys 2008. [DOI: 10.1016/j.ijrobp.2008.06.290] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Zhao L, Sandison G, Farr J, Li X. WE-E-AUD A-07: Should a Gaussian Probability Density Function Be Used to Approximate Respiration Induced Dosimetric Effects for Proton Radiotherapy? Med Phys 2008. [DOI: 10.1118/1.2962774] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Kalff A, Shortt J, Farr J, McLennan R, Lui A, Scott J, Spencer A. Laboratory tumor lysis syndrome complicating LBH589 therapy in a patient with acute myeloid leukaemia. Haematologica 2008; 93:e16-7. [DOI: 10.3324/haematol.11933] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
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Farr J, Mascia A, Allgower C, Hsi W, Anferov V. TU-FF-A2-01: Therapeutic Uniform Scanning Proton Beam Development and Characterization: Transverse Results. Med Phys 2007. [DOI: 10.1118/1.2761455] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Mascia A, Farr J, Hsi W, Allgower C, Nichiporov D. TH-C-M100F-06: Therapeutic Uniform Scanning Proton Beam Development and Characterization: Longitudinal Results. Med Phys 2007. [DOI: 10.1118/1.2761684] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Mesoloras G, Sandison G, Stewart R, Farr J, Hsi W. TH-C-230A-05: Neutron Scattered Dose Equivalent to a Fetus From Proton Radiotherapy of the Mother. Med Phys 2006. [DOI: 10.1118/1.2241868] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Farr J, Mascia A, Nichiporov D, Hsi W, Allgower C, Schreuder A, Thornton A. TU-FF-A2-04: Preliminary Radiological Characterization of An Active Proton Beam Spreading System for Therapeutic Use. Med Phys 2006. [DOI: 10.1118/1.2241647] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Yudelev M, Mogili N, Hwang T, Farr J, Maughan R. SU-FF-T-135: Commissioning of Multi-Leaf Collimator for Fast Neutron Therapy. Med Phys 2006. [DOI: 10.1118/1.2241060] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Mackie T, Kissick M, Flynn R, Westerly D, Hill P, DeLuca P, Jeraj R, Schreuder A, Farr J. TH-E-ValA-02: Simultaneous Multi-Pencil Fan-Beam-Based Intensity-Modulated Proton Therapy. Med Phys 2006. [DOI: 10.1118/1.2241971] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Allgower C, Farr J, Mascia A, Schreuder A, Hsi W. SU-FF-J-36: Commissioning of a Six-Degree-Of-Freedom Robotic Patient Positioning System in a Proton Gantry. Med Phys 2006. [DOI: 10.1118/1.2240814] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Farr J, O'Ryan-Blair A, Allgower C, Hsi W, Mascia A, Schreuder A, Thornton A. WE-D-224C-09: Dosimetric Evaluation of Proton Field Matching by a Robotic Patient Positioner. Med Phys 2006. [DOI: 10.1118/1.2241789] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Hsi W, Allgower C, Farr J, Mascia A, Fanelli L, Tylor L, Thornton A, Schreuder A. SU-FF-T-345: Measured Output Factors for Range-Modulated Spread-Out Bragg Peak Proton Beams. Med Phys 2005. [DOI: 10.1118/1.1998074] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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45
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Waite L, Wu Y, Farr J. Automatic determination of patellofemoral kinematic parameters through X-ray image processing. Biomed Sci Instrum 1998; 34:321-6. [PMID: 9603060] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Examination of plain Merchant-view X-rays of the patellofemoral joint is often used to diagnose patellofemoral joint malalignment and to qualify the pathology. As digital image processing becomes more widespread, an image processing algorithm is being developed for medical personnel to easily display, manipulate and analyze digitized plain Merchant-view X-ray films on personal computers. The method provides measurement of the kinematic parameters: sulcus angle (SA), patellofemoral congruence angle (PFC), lateral patellar angle (LPA), patellar rotation angle (PR), and lateral patellar displacement (LPD). Smooth edges of the patella and the femur are obtained by using image enhancement, edge detection and morphological thinning techniques based on the thresholds chosen manually for boundary detection. Six landmarks for determining the kinematic parameters are marked automatically on the edges of patella and femur. Parameter measurements for twelve X-ray films of six patients are calculated for analysis and comparison with hand calculated parameters. The goal is develop an algorithm that can evaluate the geometry of the patellofemoral joint, and is cost effective.
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Affiliation(s)
- L Waite
- Biomedical Engineering Program, Rose-Hulman Institute of Technology, Terre Haute, IN 47803, USA
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Farr J. Pain-free eye-drops for children. Prof Nurse 1997; 12:891. [PMID: 9326098] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
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Reinking MF, Bockrath-Pugliese K, Worrell T, Kegerreis RL, Miller-Sayers K, Farr J. Assessment of quadriceps muscle performance by hand-held, isometric, and isokinetic dynamometry in patients with knee dysfunction. J Orthop Sports Phys Ther 1996; 24:154-9. [PMID: 8866274 DOI: 10.2519/jospt.1996.24.3.154] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
One component of patient evaluation is muscle performance assessment. The purpose of this study was: 1) to determine the difference and correlation between hand-held, isometric, and isokinetic dynamometry test results in patients with knee dysfunction and 2) to determine the effect of pain during such testing. Bilateral quadriceps strength in 23 subjects with unilateral knee dysfunction was tested using concentric and eccentric isokinetic dynamometry at 60 degrees/sec, isometric dynamometry, and hand-held dynamometry, both at 60 degrees of knee flexion. Pain ratings were obtained before, during, and after each test. Statistical analysis revealed a significant difference between involved and uninvolved limbs for eccentric isokinetic dynamometry (p = 0.002) and hand-held dynamometry (p = 0.005); no difference was found between limbs for the concentric isokinetic and isometric dynamometry (p > 0.05). Mean percent deficits in quadriceps strength ranged from 11 to 18%, with no significant difference found between testing modes. Pearson product moment correlations ranged from 0.34 to 0.76 when comparing testing modes. No significant difference existed in pain scores before, during, and after each mode of testing. It was concluded that large variation existed between different testing modes, which results in different conclusions regarding the strength of the quadriceps in patients with knee dysfunction.
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Affiliation(s)
- M F Reinking
- Clarke College, Program of Physical Therapy, Dubuque, IA 52001-3198, USA
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Zubenko GS, Stiffler S, Farr J, Kopp U, Hughes H, Kaplan BB, Moossy J. Lack of variation in the nucleotide sequence corresponding to the transmembrane domain of the beta-amyloid precursor protein in Alzheimer's disease. Am J Med Genet 1993; 48:131-6. [PMID: 8291566 DOI: 10.1002/ajmg.1320480304] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
The nucleotide sequence corresponding to the APP transmembrane domain and flanking regions of charged amino acids was determined for 91 patients with histologically confirmed Alzheimer's disease, 9 patients with dementias of other etiologies, and 14 controls who had no identifiable brain disease. Twenty-eight of the AD patients had a first-degree relative with dementia. No mutations were detected among the 100 demented patients. However, one of the 14 controls exhibited a change in the 3' base of codon 716 which would not be expected to result in an amino acid substitution at this position.
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Affiliation(s)
- G S Zubenko
- Department of Psychiatry, Western Psychiatric Institute and Clinic, Pittsburgh, PA 15213
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Bockrath K, Wooden C, Worrell T, Ingersoll CD, Farr J. Effects of patella taping on patella position and perceived pain. Med Sci Sports Exerc 1993; 25:989-92. [PMID: 8231783] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Anterior knee pain syndrome (AKPS) represents a significant challenge for the sports medicine clinician. One proposed etiological factor for AKPS is poor vastus medialis obliquus (VMO) control, resulting in lateral glide of the patella. Patella taping has been advocated to increase VMO control. The purpose of this study was to determine the effects of patella taping on patella position and perceived pain. Twelve subjects (age = 29 +/- 9 yr; weight = 70.9 kg +/- 17.8; height = 174.0 cm +/- 8.1) with AKPS currently using patella taping procedures with a decrease in their symptoms participated. Each subject had Merchant's view x-rays taken pre- and post-taping while performing an isometric quadriceps contraction to determine patella rotation and patella congruency angles. Subjects also completed a visual analog pain scale after performing a 0.2 m (8") step-down both pre- and post-taping. Paired t-tests revealed no significant change in patellofemoral congruency (P = 0.98) and patella rotation angles (P = 0.80). Significant reduction (50%) in subject pain level was revealed by the visual analog scale (t(15) = 4.99; P < 0.0005). Results demonstrate that patella taping significantly reduced the perceived pain levels during a 0.2-m step-down; however, this reduction in pain was not associated with patella position changes.
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Affiliation(s)
- K Bockrath
- Krannert Graduate School of Physical Therapy, University of Indianapolis, IN 46227
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Abstract
Patients who are admitted to Intensive Care Units (ICUs) have usually been critically ill at home first. The telephone advice nurse may be the first person they contact for help when they get sick. This nurse has to distinguish rapidly between critical and non-critical patients. You might find this role a challenging career option.
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