Symptomatic knee disorders in floor layers and graphic designers. A cross-sectional studyReport as inadecuate

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BMC Musculoskeletal Disorders

, 13:188

Rehabilitation, physical therapy and occupational health


BackgroundPrevious studies have described an increased risk of developing tibio-femoral osteoarthritis TF OA, meniscal tears and bursitis among those with a trade as floor layers. The purpose of this study was to analyse symptomatic knee disorders among floor layers that were highly exposed to kneeling work tasks compared to graphic designers without knee-demanding work tasks.

MethodsData on the Knee injury and Osteoarthritis Outcome Score KOOS were collected by questionnaires. In total 134 floor layers and 120 graphic designers had a bilateral radiographic knee examination to detect TF OA and patella-femoral PF OA. A random sample of 92 floor layers and 49 graphic designers had Magnetic Resonance Imaging MRI of both knees to examine meniscal tears. Means of the subscales of KOOS were compared by analysis of variance. The risk ratio of symptomatic knee disorders defined as a combination of radiological detected knee OA or MRI-detected meniscal tears combined with a low KOOS score was estimated by logistic regression in floor layers with 95% confidence interval CI and adjusted for age, body mass index, traumas, and knee-straining sports activities. Symptomatic knee OA or meniscal tears were defined as a combination of low KOOS-scores and radiographic or MRI pathology.

ResultsSymptomatic TF and medial meniscal tears were found in floor layers compared to graphic designers with odds ratios 2.6 95%CI 0.99-6.9 and 2.04 95% CI 0.77-5.5, respectively. There were no differences in PF OA. Floor layers scored significantly lower on all KOOS subscales compared to graphic designers. Significantly lower scores on the KOOS subscales were also found for radiographic TF and PF OA regardless of trade but not for meniscal tears.

ConclusionsThe study showed an overall increased risk of developing symptomatic TF OA in a group of floor layers with a substantial amount of kneeling work positions. Prevention would be appropriate to reduce the proportion of kneeling postures e.g. by working with tools used from a standing working position.

KeywordsEpidemiology Occupational Knee Osteoarthritis KOOS AbbreviationsKOOSKnee injury and Osteoarthritis Outcome Score

Knee OAKnee osteoarthritis

TF OATibio-femoral osteoarthritis

PF OAPatello-femoral osteoarthritis

OROdds ratio

CIConfidence intervals

JSNJoint space narrowing

MRIMagnetic Resonance Imaging

2 KReference resolution of the screen 2 K is 2048 x 156 pixels

ADLFunction in daily living

QOLQuality of life

TRRepetition Time

TEEcho Time

T1 and T2Relaxation times

Sport reSport and recreation

SISignal intensities

BMIBody mass index.

Electronic supplementary materialThe online version of this article doi:10.1186-1471-2474-13-188 contains supplementary material, which is available to authorized users.

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Author: Lilli Kirkeskov Jensen - Søren Rytter - Jens Peter Bonde


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