caa a22 4500 60546071X CHVBK 20210128100240.0 cr unu---uuuuu 210128e20151101xx s 000 0 eng 10.1007/s00167-014-3142-y doi (NATIONALLICENCE)springer-10.1007/s00167-014-3142-y Anterior knee symptoms after double-bundle ACL reconstruction with hamstring tendon autografts: an ultrasonographic and power Doppler investigation [Elektronische Daten] [Takashi Kanamoto, Yoshinari Tanaka, Yasukazu Yonetani, Keisuke Kita, Hiroshi Amano, Masashi Kusano, Shinji Hirabayashi, Shuji Horibe] Purpose: Anterior knee pain related to the donor site is a frequent complication of anterior cruciate ligament reconstruction (ACLR) with bone-patellar tendon-bone autograft tissue. Even when hamstring tendon (HT) grafts are used instead, symptoms such as mild pain and discomfort can still occur. The purpose of this study was to elucidate the pathophysiology of anterior knee symptoms after ACLR with HT autografts. Methods: Fifty-seven patients (22 men and 35 women; mean age, 24.7years) who underwent anatomic double-bundle ACLR with HT autografts were examined 6months post-operatively. The presence of anterior knee symptoms, anterior knee laxity, range of motion, and muscle strength were assessed. Changes in patellar tendon and infrapatellar fat pad (IFP) morphology and blood flow were also evaluated using ultrasound. Potential variables affecting the presence of anterior knee symptoms were subjected to univariate analysis and multivariate logistic regression analysis to identify independent risk factors. Results: Six months post-operatively, the total incidence of anterior knee symptoms was 56.1% (32/57). According to univariate analysis, age, quadriceps strength, and increased blood flow in the IFP were significantly associated with the presence of anterior knee symptoms. Multivariate logistic regression analysis revealed that increased blood flow in the IFP was an independent factor for the presence of anterior knee symptoms (odds ratio 5.0; 95% confidence interval 1.3-19.9). There were no significant findings inside the patellar tendon. Conclusions: Increased blood flow in the IFP was identified as an independent factor for the presence of anterior knee symptoms 6months after ACLR with HT autografts. The ultrasound evaluation can help to define precisely the origin of anterior knee symptoms after ACLR with HT autografts. Level of evidence: Case series with no comparison groups, Level IV. Springer-Verlag Berlin Heidelberg, 2014 Anterior knee problems/symptoms nationallicence ACL reconstruction nationallicence Ultrasound nationallicence Infrapatellar fat pad nationallicence Increased blood flow nationallicence Kanamoto Takashi Department of Rehabilitation, Osaka Rosai Hospital, 1179-3, Nagasone-cho, Kita-ku, 597-8025, Sakai, Osaka, Japan aut Tanaka Yoshinari Department of Orthopaedic Surgery, Osaka Rosai Hospital, Sakai, Japan aut Yonetani Yasukazu Department of Orthopaedic Surgery, Osaka University Graduate School of Medicine, Osaka University, Osaka, Japan aut Kita Keisuke Department of Orthopaedic Surgery, Osaka Rosai Hospital, Sakai, Japan aut Amano Hiroshi Department of Orthopaedic Surgery, Osaka Rosai Hospital, Sakai, Japan aut Kusano Masashi Department of Orthopaedic Surgery, Kansai Rosai Hospital, Sakai, Japan aut Hirabayashi Shinji Department of Rehabilitation, Osaka Rosai Hospital, 1179-3, Nagasone-cho, Kita-ku, 597-8025, Sakai, Osaka, Japan aut Horibe Shuji Faculty of Comprehensive Rehabilitation, Osaka Prefecture University, Habikino, Osaka, Japan aut Knee Surgery, Sports Traumatology, Arthroscopy Springer Berlin Heidelberg 23/11(2015-11-01), 3324-3329 0942-2056 23:11<3324 2015 23 167 https://doi.org/10.1007/s00167-014-3142-y text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s00167-014-3142-y text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Kanamoto Takashi Department of Rehabilitation, Osaka Rosai Hospital, 1179-3, Nagasone-cho, Kita-ku, 597-8025, Sakai, Osaka, Japan aut NATIONALLICENCE 700 1- Tanaka Yoshinari Department of Orthopaedic Surgery, Osaka Rosai Hospital, Sakai, Japan aut NATIONALLICENCE 700 1- Yonetani Yasukazu Department of Orthopaedic Surgery, Osaka University Graduate School of Medicine, Osaka University, Osaka, Japan aut NATIONALLICENCE 700 1- Kita Keisuke Department of Orthopaedic Surgery, Osaka Rosai Hospital, Sakai, Japan aut NATIONALLICENCE 700 1- Amano Hiroshi Department of Orthopaedic Surgery, Osaka Rosai Hospital, Sakai, Japan aut NATIONALLICENCE 700 1- Kusano Masashi Department of Orthopaedic Surgery, Kansai Rosai Hospital, Sakai, Japan aut NATIONALLICENCE 700 1- Hirabayashi Shinji Department of Rehabilitation, Osaka Rosai Hospital, 1179-3, Nagasone-cho, Kita-ku, 597-8025, Sakai, Osaka, Japan aut NATIONALLICENCE 700 1- Horibe Shuji Faculty of Comprehensive Rehabilitation, Osaka Prefecture University, Habikino, Osaka, Japan aut NATIONALLICENCE 773 0- Knee Surgery, Sports Traumatology, Arthroscopy Springer Berlin Heidelberg 23/11(2015-11-01), 3324-3329 0942-2056 23:11<3324 2015 23 167