{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2022,3,29]],"date-time":"2022-03-29T10:48:22Z","timestamp":1648550902380},"reference-count":34,"publisher":"British Editorial Society of Bone & Joint Surgery","issue":"2","license":[{"start":{"date-parts":[[2016,2,1]],"date-time":"2016-02-01T00:00:00Z","timestamp":1454284800000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/online.boneandjoint.org.uk\/TDM"}],"content-domain":{"domain":["online.boneandjoint.org.uk"],"crossmark-restriction":true},"short-container-title":["The Bone &amp; Joint Journal"],"published-print":{"date-parts":[[2016,2]]},"abstract":"<jats:sec><jats:title>Aims<\/jats:title><jats:p> This study aimed to determine the relationship between pedicle-lengthening distance and bulge-canal volume ratio in cases of lumbar spinal stenosis, to provide a theoretical basis for the extent of lengthening in pedicle-lengthening osteotomies. <\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p> Three-dimensional reconstructions of CT images were performed for 69 patients (33 men and 36 women) (mean age 49.96 years; 24 to 81). Simulated pedicle-lengthening osteotomies and disc bulge and spinal canal volume calculations were performed using Mimics software. <\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p> The mean spinal canal volume of the two groups, L4 and L5, were 14 646.81 mm<jats:sup>3<\/jats:sup> (5918.60 to 22 717.77) and 16 408.47 mm<jats:sup>3<\/jats:sup> (8678.21 to 31 204.79), respectively. The mean lengthening distance was 2.17 mm (0.5 to 4.8) and the mean bulge-canal volume ratio was 0.23 (0.05 to 0.48). The pedicle-lengthening distance of the two groups were very strongly correlated with disc bulge volume and bulge-canal volume ratio (p &lt; 0.001); the predictive equation was established as L = 0.06 + 9.06R (where L equals the pedicle-lengthening distance and R represents the bulge-canal volume ratio). <\/jats:p><\/jats:sec><jats:sec><jats:title>Discussion<\/jats:title><jats:p> Our findings indicated that lumbar pedicle-lengthening distance strongly correlates with bulge-canal volume ratio, which can be estimated before surgery from CT images. Take home message: The predictive equation could help surgeons to decide the pedicle lengthening distance according to individual's condition and guide the surgery effectively. 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