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Achilles tendon length, ATRA, heel\u2010rise height (HRH), drop countermovement jump (Drop CMJ) and PROMs (Achilles tendon total rupture score (ATRS) and physical activity scale (PAS)) were evaluated 6 and 12\u00a0months after injury. Achilles tendon length was evaluated using US, while the ATRA was measured with a goniometer.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Sixty patients (13 women, 47\u00a0men), mean (SD) age 43 (9) years, with an acute ATR undergoing either surgical (35%) or non\u2010surgical (65%) treatment were evaluated. A negative correlation (<jats:italic>r<\/jats:italic>\u2009=\u2009\u2212 0.356, <jats:italic>p<\/jats:italic>\u2009=\u20090.010) between relative ATRA and tendon elongation was seen at 12\u00a0months after ATR. There were also significant positive correlations at 6 and 12\u00a0months between relative ATRA and HRH (<jats:italic>r<\/jats:italic>\u2009=\u20090.330, <jats:italic>p<\/jats:italic>\u2009=\u20090.011 and <jats:italic>r<\/jats:italic>\u2009=\u20090.379, <jats:italic>p<\/jats:italic>\u2009=\u20090.004). There were no correlations between ATRA and ATRS or ATRA and Drop CMJ, at either 6 or 12\u00a0months after the injury.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>In combination with other clinical evaluations such as HRH and US, ATRA could be a clinical tool for indirect measurements of tendon elongation. However, ATRA cannot be recommended as a direct surrogate for US for determining Achilles tendon length.<\/jats:p><\/jats:sec><jats:sec><jats:title>Level of evidence<\/jats:title><jats:p>III.<\/jats:p><\/jats:sec>","DOI":"10.1007\/s00167-022-07142-9","type":"journal-article","created":{"date-parts":[[2022,9,10]],"date-time":"2022-09-10T00:02:53Z","timestamp":1662768173000},"page":"4250-4257","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":9,"title":["Achilles tendon resting angle is able to detect deficits after an Achilles tendon rupture, but it is not a surrogate for direct measurements of tendon elongation, function or symptoms"],"prefix":"10.1002","volume":"30","author":[{"given":"Elin","family":"Larsson","sequence":"first","affiliation":[{"name":"<!--<label>1<\/label>--> The Department of Orthopaedics Sahlgrenska University Hospital M\u00f6lndal, Institute of Clinical Sciences at Sahlgrenska Academy, Gothenburg University G\u00f6teborgsv\u00e4gen 31 431 80 M\u00f6lndal Sweden"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Katarina Nilsson","family":"Helander","sequence":"additional","affiliation":[{"name":"<!--<label>1<\/label>--> The Department of Orthopaedics Sahlgrenska University Hospital M\u00f6lndal, Institute of Clinical Sciences at Sahlgrenska Academy, Gothenburg University G\u00f6teborgsv\u00e4gen 31 431 80 M\u00f6lndal Sweden"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lotta","family":"Falkheden Henning","sequence":"additional","affiliation":[{"name":"<!--<label>2<\/label>--> Department of Orthopaedics Institute of Clinical Sciences at Sahlgrenska Academy, Gothenburg University Gothenburg Sweden"},{"name":"<!--<label>3<\/label>--> Aktiva Rehab Team Gothenburg Sweden"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mervi","family":"Heiskanen","sequence":"additional","affiliation":[{"name":"<!--<label>1<\/label>--> The Department of Orthopaedics Sahlgrenska University Hospital M\u00f6lndal, Institute of Clinical Sciences at Sahlgrenska Academy, Gothenburg University G\u00f6teborgsv\u00e4gen 31 431 80 M\u00f6lndal Sweden"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Michael R.","family":"Carmont","sequence":"additional","affiliation":[{"name":"<!--<label>2<\/label>--> Department of Orthopaedics Institute of Clinical Sciences at Sahlgrenska Academy, Gothenburg University Gothenburg Sweden"},{"name":"<!--<label>4<\/label>--> The Department of Trauma and Orthopaedic Surgery Princess Royal Hospital, Shrewsbury and Telford Hospital NHS Trust Shropshire UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Karin","family":"Gr\u00e4vare Silbernagel","sequence":"additional","affiliation":[{"name":"<!--<label>5<\/label>--> Department of Physical Therapy University of Delaware Newark DE 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