No gender differences in the risk of kinesiophobia after anterior cruciate ligament reconstruc-tion in long term follow up. *Leho Rips1,2, Mihekl Luik1, Tauno Koovit1, Helena Saar1, Rein Kuik1, Jüri-Toomas Kartus1,3, Madis Rahu1,2 1Tartu University Hospital, Sports Medicine and Rehabilitation Clinic, Puusepa 1ª, 50406 Tartu, Es-tonia, kliinikum@kliinikum.ee 2University of Tartu, Department of Sports Medicine and Rehabilitation, Institute of Clinical Medi-cine, Faculty of Medicine, Ülikooli 8, 50090 Tartu, Estonia 3University of Gothenburg, Box 100, 405 30, Göteborg, Sweden *Corresponding author: Leho Rips, Tartu University Hospital, Sports Medicine and Rehabilitation Clinic, Puusepa 1ª, 50406 Tartu, Estonia. E-mail: leho.rips@kliinikum.ee 1.General Introduction This dataset contains data collected in Tartu University Hospital in Tartu, Estonia during the study period in 2019-2022. It is being made public both to act as supplementary data for publications and in order for other re-searchers to use this data in their own work. This research project was not supported by grants. The study was approved by the Research Ethics Committee of the University of Tartu no.290/T-4. 2.Purpose of the test campaign Psychological and physiological factors could negatively affect patients' recovery and in-crease re-injury rate after anterior cruciate ligament reconstruction (ACLR). In daily practice, sur-geons and physiotherapists see athletes struggling to improve muscle strength and complaining of a lack of self-confidence during their progress to return to sport. 3.Description of the data in this data set Data was collected in Tartu University Hospital, Tartu Estonia during the study period in 2019-2022. Data was collected and saved in PC used for scientific work. All the measurements where done with same instruments. Methods Following methods were used: patients completed the Knee injury and Osteoarthritis Outcome Score (KOOS), Oxford Knee score and Tampa Scale of Kinesiophobia (TSK-17). Quadriceps and hamstring muscle isokinetic strength was assessed at 60°/sec and 180°/sec using the HumacNorm dynamometer. Functional performance was tested with the single-leg hop test for distance and the Y-balance test for anterior reach Anthropometric measurements Body mass (kg) and height (cm) were measured at inclusion by the same investigator at the Tart u University Hospital, Sports Medicine and Rehabilitation Clinic medical center using standardized equipment, and their body mass index (BMI) was calculated in kg/m2. Tampa Scale of Kinesiophobia (TSK-17) The Tampa Scale for Kinesiophobia was developed for self-report checklist to measure fear of pain during the movements or injury (reinjury). All participants fulfilled TSK-17 during the study. TSK-17 consist 17 questions. Standardized answer options are given 4-point Likert scale and each ques-tion is assigned a score from 0 to 4. A normalized score between 17-68 points is calculated. Over 37 points is cut off score for kinesiophobia. Knee injury and Osteoarthritis Outcome Score KOOS and Oxford Knee score (Oxford KS) scoring All participants were asked to fulfill carefuly KOOS and Oxford KS questionnaires. KOOS con-sists of five subscales: Symptoms (S), Pain (P), Functional ADL (FADL), Sport and Recreation Function (Sport/Rec) and Knee - Related Quality of life (QOL) and total KOOS Outcome (O) scores. Standardized answer options are given (5 Likert boxes) and each question is assigned a score from 0 to 4. A normalized score (100 indicating no symptoms and 0 indicating extreme symp-toms) is calculated for each subscale. (54) Oxford KS consist 12 questions. Standardized answer options are given (5 Likert boxes) and each question is assigned a score from 0 to 4. A normalized score (40 to 48 indicating no symptoms or satisfactory joint function, 30 to 39 - moderate knee ar-thritis, 20 to 29 - moderate to severe knee arthritis and 0 to 19 indicating severe knee arthiritis ) is calculated in total points. Quadriceps and hamstring muscle isokinetic strength 10 minutes cycling with comfortable resistance on a stationary bike was used for warm up. After warm following tests were performed: isokinetic assessment for knee flexors and extensors, single leg hop test for distance and Y-Balance test for anterior reach. Non-operated leg was tested first in all times. All measurements were instructed by the same specialized physiotherapist. Quadriceps and Hamstring muscle strength for 60°/s and 180°/s was measured with an isokinetic dynamometer. (Humac Norm USA). For the testing speed of 180°/s five trial and fifteen testing repetitions and for the speed of 60°/s three trial and three testing repetitions were used. Resting time between trial and testing was two minutes, between different speeds one minute and between legs two minutes. Maximal peak torques were used for statistical analysis. Single-leg hop test The single leg hop test for distance was used for lower limb functional testing. Testing started with standing on one leg, toe behind a marked line. Although a commonly used jumping technique is counter-movement jump with help of hands, we asked to keep hands on the hips throughout the jump to reduce compensative aid from the hands. The participant was instructed to jump as far as possible and land on the same leg without losing balance. If the patient had contact to the ground with contralateral limb, had loss of balance or had additional hops after landing, the result was not measured. Distance was measured from the starting line to the heel of the leg being tested. For both legs three trials and three jumps for maximal effort were allowed. Longest distance for both legs were used for statistical analysis. Y-balance test Y balance test (Move2Perform, Evansville, IN, USA) for anterior reach was used to measure dy-namic balance. Participants performed three trials for familiarization and three for testing. Test was started with standing barefoot on the testing kit. They had to push the wooden box with contrala-teral leg as far as possible with continuous movement and return to their starting position without losing balance. Longest distance was used for statistical analysis. EXEL table datasheet description: Study nr - participant number, ID Gender M- male, F- female. BTB - bone tendon bone anterior cruciate ligament autograft Dex - dextra Sin - sinistra BMI - Body mass index Non OP - non operated limb OP - operated limb Knee AROM ext - knee range of motion extension Knee AROM flex - knee range of motion flextion HQ ratio - hamstring-quatriceps ratio PT - peak torque SLH - single leg hop test Y-R - Y balance test KOOS - self reported knee outcome score Tampa - Tampa kinesiophobia score Weight - kilograms Height - cm 4.Sharing Embargo until published.