Purpose: Radiological measurement scores are used by orthopaedic physiotherapists in triage and surveillance of patients with degenerative changes of the tibiofemoral and patellofemoral joints. The purpose of this study was to estimate the intra-and inter-observer reliability of a radiological measurement score to assess patellofemoral joint osteoarthritis, the Jones Patellofemoral Osteoarthritis Score (JPOS), with an orthopaedic physiotherapist and three grades of junior surgeons/doctors. Methods: A total of 390 skyline X-rays of the patellofemoral joint were reviewed on 2 occasions, 4 weeks apart, by an orthopaedic physiotherapist, 2 orthopaedic surgeons, and an orthopaedic doctor. Intra-and inter-observer reliability of the JPOS was calculated using a weighted kappa analysis. Results: The results indicated that while there was good overall intra-observer agreement for this measurement score for all assessors, inter-observer reliability was generally poor between the orthopaedic physiotherapist and the orthopaedic surgeons/doctor. Conclusion: Our findings call into question the use of the JPOS by orthopaedic physiotherapists working in triage or orthopaedic surveillance programmes with other orthopaedic clinicians.Key Words: patella; radiography; physical therapy; reliability of results. RÉ SUMÉObjectif : Les mesures radiologiques sont utilisé es par les physiothé rapeutes orthopé diques pour le triage et la surveillance des patients qui vivent des changements dé gé né ratifs à l'articulation fé morotibiale et à l'articulation patellofé morale. L'objectif de cette é tude é tait d'estimer, avec un physiothé rapeute orthopé dique et trois caté gories de chirurgiens et mé decins novices, la fiabilité intra et interobservateur d'une mesure radiologique pour l'é valuation de l'arthrose patellofé morale à l'aide de l'é chelle d'arthrose patellofé morale de Jones (JPOS). Mé thode : Au total, 390 incidences fé moropatellaires ont é té examiné es en deux occasions, à quatre semaines d'intervalle, par un physiothé rapeute orthopé dique, par deux chirurgiens orthopé diques et par un orthopé diste. La fiabilité intra et interobservateur de la JPOS a é té calculé e à l'aide du coefficient Kappa pondé ré . Ré sultats : Les ré sultats ont indiqué que bien que tous les é valuateurs é taient plutô t d'accord avec cette é chelle de mesure, la fiabilité interobservateur é tait gé né ralement faible entre les physiothé rapeutes orthopé diques et les chirurgiens orthopé diques et orthopé distes. Conclusion : Nos conclusions remettent en questions l'utilisation due la JPOS par les physiothé rapeutes orthopé diques qui travaillent au triage ou dans des programmes de surveillance orthopé dique avec d'autres cliniciens en orthopé die.Osteoarthritis (OA) of the knee joint is a common disorder that is functionally disabling. 1,2 Although OA of the tibiofemoral joint is more common, patellofemoral OA is an important cause of disability for a large number of patients. 3,4 With the evolution of health care and growing demands on ho...
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