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Items: 30


Prevalence of femoroacetabular impingement syndrome among young and middle-aged Caucasian adults.

Kopec JA, Hong Q, Wong H, Zhang CJ, Ratzlaff C, Cibere J, Li LC, Prlic H, Wilson DR, Forster BB, Esdaile JM.

J Rheumatol. 2019 Nov 1. pii: jrheum.190345. doi: 10.3899/jrheum.190345. [Epub ahead of print]


Alignment differs between patellofemoral osteoarthritis cases and matched controls: An upright 3D MRI study.

Macri EM, d'Entremont AG, Crossley KM, Hart HF, Forster BB, Wilson DR, Ratzlaff CR, Goldsmith CH, Khan KM.

J Orthop Res. 2019 Mar;37(3):640-648. doi: 10.1002/jor.24237. Epub 2019 Mar 1.


Relationship Between Hip Morphology and Hip-Related Patient-Reported Outcomes in Young and Middle-Aged Individuals: A Population-Based Study.

Kopec JA, Qian H, Cibere J, Wong H, Li LC, Barber M, Prlic HM, Zhang C, Ratzlaff C, Forster BB, Esdaile JM; IMPAKT-HIP Study Team.

Arthritis Care Res (Hoboken). 2019 Sep;71(9):1202-1208. doi: 10.1002/acr.23774. Epub 2019 Jul 19.


A quantitative metric for knee osteoarthritis: reference values of joint space loss.

Ratzlaff C, Ashbeck EL, Guermazi A, Roemer FW, Duryea J, Kwoh CK.

Osteoarthritis Cartilage. 2018 Sep;26(9):1215-1224. doi: 10.1016/j.joca.2018.05.014. Epub 2018 May 26.


New science in plain sight: Citizen scientists lead to the discovery of optical structure in the upper atmosphere.

MacDonald EA, Donovan E, Nishimura Y, Case NA, Gillies DM, Gallardo-Lacourt B, Archer WE, Spanswick EL, Bourassa N, Connors M, Heavner M, Jackel B, Kosar B, Knudsen DJ, Ratzlaff C, Schofield I.

Sci Adv. 2018 Mar 14;4(3):eaaq0030. doi: 10.1126/sciadv.aaq0030. eCollection 2018 Mar.


Race, sex, and risk factors in radiographic worsening of knee osteoarthritis.

Vina ER, Ran D, Ashbeck EL, Ratzlaff C, Kwoh CK.

Semin Arthritis Rheum. 2018 Feb;47(4):464-471. doi: 10.1016/j.semarthrit.2017.08.008. Epub 2017 Aug 31.


The effect of prism on preferred retinal locus.

Lewerenz D, Blanco D, Ratzlaff C, Zodrow A.

Clin Exp Optom. 2018 Mar;101(2):260-266. doi: 10.1111/cxo.12602. Epub 2017 Sep 20.


Patellofemoral and tibiofemoral alignment in a fully weight-bearing upright MR: Implementation and repeatability.

Macri EM, Crossley KM, d'Entremont AG, Hart HF, Forster BB, Wilson DR, Ratzlaff CR, Walsh AM, Khan KM.

J Magn Reson Imaging. 2018 Mar;47(3):841-847. doi: 10.1002/jmri.25823. Epub 2017 Aug 21.


Relationship between physical activity and hip pain in persons with and without cam or pincer morphology: a population-based case-control study.

Kopec JA, Cibere J, Li LC, Zhang C, Barber M, Qian H, Wong H, Steininger G, Prlic H, Simatovic J, Ratzlaff C, Sayre EC, Ye J, Forster BB, Esdaile JM; IMPAKT-HIP Study Team.

Osteoarthritis Cartilage. 2017 Jul;25(7):1055-1061. doi: 10.1016/j.joca.2017.02.795. Epub 2017 Feb 20.


Femoroacetabular impingement and osteoarthritis of the hip.

Zhang C, Li L, Forster BB, Kopec JA, Ratzlaff C, Halai L, Cibere J, Esdaile JM.

Can Fam Physician. 2015 Dec;61(12):1055-60.


The validity of a non-radiologist reader in identifying cam and pincer femoroacetabular impingement (FAI) using plain radiography.

Ratzlaff C, Zhang C, Korzan J, Josey L, Wong H, Cibere J, Prlic HM, Kopec JA, Esdaile JM, Li LC, Barber M, Forster BB.

Rheumatol Int. 2016 Mar;36(3):371-6. doi: 10.1007/s00296-015-3361-7. Epub 2015 Oct 3.


Open-MRI measures of cam intrusion for hips in an anterior impingement position relate to acetabular contact force.

Buchan LL, Zhang H, Konan S, Heaslip I, Ratzlaff CR, Wilson DR.

J Orthop Res. 2016 Feb;34(2):205-16. doi: 10.1002/jor.22999. Epub 2015 Sep 8.


Validity and responsiveness of a new measure of knee osteophytes for osteoarthritis studies: data from the osteoarthritis initiative.

Hakky M, Jarraya M, Ratzlaff C, Guermazi A, Duryea J.

Osteoarthritis Cartilage. 2015 Dec;23(12):2199-2205. doi: 10.1016/j.joca.2015.07.003. Epub 2015 Jul 14.


Location-specific hip joint space width for progression of hip osteoarthritis--data from the osteoarthritis initiative.

Ratzlaff C, Van Wyngaarden C, Duryea J.

Osteoarthritis Cartilage. 2014 Oct;22(10):1481-7. doi: 10.1016/j.joca.2014.05.017.


What fooled us in the knee may trip us up in the hip: lessons from arthroscopy.

Kemp JL, Crossley KM, Roos EM, Ratzlaff C.

Br J Sports Med. 2014 Aug;48(16):1200-1. doi: 10.1136/bjsports-2014-093831. Epub 2014 Jun 6. No abstract available.


Local area cartilage segmentation: a semiautomated novel method of measuring cartilage loss in knee osteoarthritis.

Duryea J, Iranpour-Boroujeni T, Collins JE, Vanwynngaarden C, Guermazi A, Katz JN, Losina E, Russell R, Ratzlaff C.

Arthritis Care Res (Hoboken). 2014 Oct;66(10):1560-5.


Down on one knee: soft tissue knee injuries across the lifespan.

Thorlund JB, Culvenor AG, Ratzlaff C.

Arthritis Res Ther. 2014;16(6):499.


Reliability of hip examination tests for femoroacetabular impingement.

Ratzlaff C, Simatovic J, Wong H, Li L, Ezzat A, Langford D, Esdaile JM, Kennedy C, Embley P, Caves D, Hopkins T, Cibere J.

Arthritis Care Res (Hoboken). 2013 Oct;65(10):1690-6. doi: 10.1002/acr.22036.


A rapid, novel method of volumetric assessment of MRI-detected subchondral bone marrow lesions in knee osteoarthritis.

Ratzlaff C, Guermazi A, Collins J, Katz JN, Losina E, Vanwyngaarden C, Russell R, Iranpour T, Duryea J.

Osteoarthritis Cartilage. 2013 Jun;21(6):806-14. doi: 10.1016/j.joca.2013.03.007. Epub 2013 Mar 18.


Clinical validation of an Internet-based questionnaire for ascertaining hip and knee osteoarthritis.

Ratzlaff C, Koehoorn M, Cibere J, Kopec J.

Osteoarthritis Cartilage. 2012 Dec;20(12):1568-73. doi: 10.1016/j.joca.2012.08.017. Epub 2012 Sep 10.


Is lifelong knee joint force from work, home, and sport related to knee osteoarthritis?

Ratzlaff CR, Koehoorn M, Cibere J, Kopec JA.

Int J Rheumatol. 2012;2012:584193. doi: 10.1155/2012/584193. Epub 2012 Jul 17.


The prevalence of radiographic femoroacetabular impingement in younger individuals undergoing total hip replacement for osteoarthritis.

Lung R, O'Brien J, Grebenyuk J, Forster BB, De Vera M, Kopec J, Ratzlaff C, Garbuz D, Prlic H, Esdaile JM.

Clin Rheumatol. 2012 Aug;31(8):1239-42. doi: 10.1007/s10067-012-1981-9. Epub 2012 May 3.


Good news, bad news: sports matter but occupational and household activity really matter - sport and recreation unlikely to be a panacea for public health.

Ratzlaff CR.

Br J Sports Med. 2012 Aug;46(10):699-701. doi: 10.1136/bjsports-2011-090800. Epub 2012 Mar 12. No abstract available.


Influence of lifetime hip joint force on the risk of self-reported hip osteoarthritis: a community-based cohort study.

Ratzlaff CR, Steininger G, Doerfling P, Koehoorn M, Cibere J, Liang MH, Wilson DR, Esdaile JM, Kopec JA.

Osteoarthritis Cartilage. 2011 Apr;19(4):389-98. doi: 10.1016/j.joca.2011.01.006. Epub 2011 Jan 19.


Reliability and validity of an internet-based questionnaire measuring lifetime physical activity.

De Vera MA, Ratzlaff C, Doerfling P, Kopec J.

Am J Epidemiol. 2010 Nov 15;172(10):1190-8. doi: 10.1093/aje/kwq273. Epub 2010 Sep 28.


Lifetime trajectory of physical activity according to energy expenditure and joint force.

Ratzlaff CR, Doerfling P, Steininger G, Koehoorn M, Cibere J, Liang M, Wilson DR, Esdaile J, Kopec J.

Arthritis Care Res (Hoboken). 2010 Oct;62(10):1452-9. doi: 10.1002/acr.20243.


Work-related repetitive strain injury and leisure-time physical activity.

Ratzlaff CR, Gillies JH, Koehoorn MW.

Arthritis Rheum. 2007 Apr 15;57(3):495-500.


Semitendinosus repair augmentation of acute anterior cruciate ligament rupture.

Gomez T, Ratzlaff C, McConkey JP, Dean E, Thompson JP.

Can J Sport Sci. 1990 Jun;15(2):137-42.


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