{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,15]],"date-time":"2026-07-15T22:00:23Z","timestamp":1784152823345,"version":"3.55.0"},"reference-count":19,"publisher":"British Editorial Society of Bone & Joint Surgery","issue":"10","license":[{"start":{"date-parts":[[2007,10,1]],"date-time":"2007-10-01T00:00:00Z","timestamp":1191196800000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/online.boneandjoint.org.uk\/TDM"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["The Journal of Bone and Joint Surgery. British volume"],"published-print":{"date-parts":[[2007,10]]},"abstract":"<jats:p> The deformity index is a new radiological measurement of the degree of deformity of the femoral head in unilateral Perthes\u2019 disease. Its values represent a continuous outcome measure of deformity incorporating changes in femoral epiphyseal height and width compared with the unaffected side. The sphericity of the femoral head in 30 radiographs (ten normal and 20 from patients with Perthes\u2019 disease) were rated blindly as normal, mild, moderate or severe by three observers. Further blinded measurements of the deformity index were made on two further occasions with intervals of one month. <\/jats:p><jats:p> There was good agreement between the deformity index score and the subjective grading of deformity. Intra- and interobserver agreement for the deformity index was high. The intraobserver intraclass correlation coefficient for each observer was 0.98, 0.99 and 0.97, respectively, while the interobserver intraclass correlation coefficient was 0.98 for the first and 0.97 for the second set of calculations. <\/jats:p><jats:p> We also reviewed retrospectively 96 radiographs of children with Perthes\u2019 disease, who were part of a multicentre trial which followed them to skeletal maturity. We found that the deformity index at two years correlated well with the Stulberg grading at skeletal maturity. A deformity index value above 0.3 was associated with the development of an aspherical femoral head. Using a deformity index value of 0.3 to divide groups for risk gives a sensitivity of 80% and specificity of 81% for predicting a Stulberg grade of III or IV. <\/jats:p><jats:p> We conclude that the deformity index at two years is a valid and reliable radiological outcome measure in unilateral Perthes\u2019 disease. <\/jats:p>","DOI":"10.1302\/0301-620x.89b10.18747","type":"journal-article","created":{"date-parts":[[2007,10,23]],"date-time":"2007-10-23T19:51:55Z","timestamp":1193169115000},"page":"1369-1374","source":"Crossref","is-referenced-by-count":29,"title":["The deformity index as a predictor of final radiological outcome in Perthes\u2019 disease"],"prefix":"10.1302","volume":"89-B","author":[{"given":"D.","family":"Nelson","sequence":"first","affiliation":[{"name":"Department of Orthopaedics, University of British Columbia, 1624 7th Avenue, Prince George, Vancouver, British Columbia VS2 4E3, Canada."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"M.","family":"Zenios","sequence":"additional","affiliation":[{"name":"The Children\u2019s Hospital at Westmead, Westmead, New South Wales 2145, Australia."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"K.","family":"Ward","sequence":"additional","affiliation":[{"name":"The Children\u2019s Hospital at Westmead, Westmead, New South Wales 2145, Australia."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"M.","family":"Ramachandran","sequence":"additional","affiliation":[{"name":"The Children\u2019s Hospital at Westmead, Westmead, New South Wales 2145, Australia."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"D. G.","family":"Little","sequence":"additional","affiliation":[{"name":"The Children\u2019s Hospital at Westmead, Westmead, New South Wales 2145, Australia."}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"42","reference":[{"key":"R1","doi-asserted-by":"crossref","unstructured":"Gower WE, Johnston RC. Legg-Perthes disease: long term follow up of thirty-six patients. J Bone Joint Surg [Am] 1971;53-A:759\u201368.","DOI":"10.2106\/00004623-197153040-00015"},{"key":"R2","doi-asserted-by":"crossref","unstructured":"Rowe SM, Moon ES, Song EK, et al. The correlation between coxa magna and final outcome in Legg-Calve-Perthes disease. J Pediatr Orthop 2005;25:22\u20137.","DOI":"10.1097\/00004694-200501000-00007"},{"key":"R3","doi-asserted-by":"crossref","unstructured":"Shapiro F. Legg-Calve-Perthes disease. In: Shapiro F, ed. Paediatric orthopaedic deformities. 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