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Muscular or tendinous lesions to the anterior half of the common extensor origin (CEO) may provoke a deficiency in the elbow dynamic stabilizers, regardless of their traumatic, degenerative, or iatrogenic aetiology. Furthermore, a role for the radial band of the lateral collateral ligament (R\u2010LCL) has been postulated in the aetiology of lateral elbow pain. This study aimed to evaluate the effects of sequential lateral releases with dynamic ultrasound, evaluating its capability to detect lesions of the CEO and of the R\u2010LCL.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>Ultrasound investigation of the lateral compartment of the elbow was performed on nine cadaveric specimens with a 10\u00a0MHz linear probe in basal conditions, after the release of the anterior half of the CEO and after complete R\u2010LCL release. The lateral joint line widening (<jats:italic>\u03bb<\/jats:italic>) was the primary outcome parameter, measured as the linear distance between the humeral and radial articular surfaces.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>The release of the anterior half of the CEO significantly increased <jats:italic>\u03bb<\/jats:italic> by 200% compared to the starting position (<jats:italic>p<\/jats:italic>\u2009=\u20090.0008) and the previously loaded position (<jats:italic>p<\/jats:italic>\u2009=\u20090.0015). Conversely, further release of the R\u2010LCL caused only a marginal, non\u2010significant increase in <jats:italic>\u03bb<\/jats:italic>.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>Ultrasound evaluation can detect changes related to tendon tears or muscular avulsions of the CEO and can depict lateral elbow compartmental patholaxity by assessing articular space widening while scanning under dynamic stress. However, it cannot reliably define if the R\u2010LCL is injured. Iatrogenic damage to the CEO should be carefully avoided, since it causes a massive increase in compartmental laxity.<\/jats:p><\/jats:sec>","DOI":"10.1007\/s00167-021-06711-8","type":"journal-article","created":{"date-parts":[[2021,8,28]],"date-time":"2021-08-28T12:02:33Z","timestamp":1630152153000},"page":"4067-4074","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":10,"title":["Ultrasound evaluation shows increase in laxity after partial common extensor origin detachment but not after additional lesion of the radial band of the lateral collateral ligament"],"prefix":"10.1002","volume":"29","author":[{"given":"Paolo","family":"Arrigoni","sequence":"first","affiliation":[{"name":"<!--<label>1<\/label>--> U.O.C. 1\u00b0 Clinica Ortopedica ASST Centro Specialistico Ortopedico Traumatologico Gaetano Pini\u2010CTO Piazza Cardinal Ferrari 1 20122 Milan Italy"},{"name":"<!--<label>2<\/label>--> Laboratory of Applied Biomechanics, Department of Biomedical Sciences for Health Universit\u00e0 degli Studi di Milano Via Mangiagalli 31 20133 Milan Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6284-7977","authenticated-orcid":false,"given":"Davide","family":"Cucchi","sequence":"additional","affiliation":[{"name":"<!--<label>4<\/label>--> Department of Orthopaedics and Trauma Surgery Universit\u00e4tsklinikum Bonn Venusberg\u2010Campus 1 53127 Bonn Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Francesco","family":"Luceri","sequence":"additional","affiliation":[{"name":"<!--<label>1<\/label>--> U.O.C. 1\u00b0 Clinica Ortopedica ASST Centro Specialistico Ortopedico Traumatologico Gaetano Pini\u2010CTO Piazza Cardinal Ferrari 1 20122 Milan Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Andrea","family":"Zagarella","sequence":"additional","affiliation":[{"name":"<!--<label>5<\/label>--> U.O.C. Radiodiagnostica ASST Centro Specialistico Ortopedico Traumatologico Gaetano Pini\u2010CTO Piazza Cardinal Ferrari 1 20122 Milan Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Michele","family":"Catapano","sequence":"additional","affiliation":[{"name":"<!--<label>5<\/label>--> U.O.C. Radiodiagnostica ASST Centro Specialistico Ortopedico Traumatologico Gaetano Pini\u2010CTO Piazza Cardinal Ferrari 1 20122 Milan Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2786-8099","authenticated-orcid":false,"given":"Alessandra","family":"Menon","sequence":"additional","affiliation":[{"name":"<!--<label>1<\/label>--> U.O.C. 1\u00b0 Clinica Ortopedica ASST Centro Specialistico Ortopedico Traumatologico Gaetano Pini\u2010CTO Piazza Cardinal Ferrari 1 20122 Milan Italy"},{"name":"<!--<label>2<\/label>--> Laboratory of Applied Biomechanics, Department of Biomedical Sciences for Health Universit\u00e0 degli Studi di Milano Via Mangiagalli 31 20133 Milan Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Valentina","family":"Bruno","sequence":"additional","affiliation":[{"name":"<!--<label>6<\/label>--> Istituto Clinico San Siro Via Monreale, 18 20148 Milan Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mauro","family":"Gallazzi","sequence":"additional","affiliation":[{"name":"<!--<label>5<\/label>--> U.O.C. 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This article does not contain any studies with human participants performed by any of the authors (cadaveric study).","order":3,"name":"Ethics","group":{"name":"EthicsHeading","label":"Ethical approval"}}]}}