This readme.txt file was generated on 2023-10-16 by Dr Anne Delextrat GENERAL INFORMATION 1. Title of Dataset: Patient Demographics for The role of strength-related factors on psychological readiness for return to sport following Anterior Cruciate Ligament (ACL) reconstruction 2. Author Information A. Principal Investigator Contact Information Name: Anne Delextrat Institution: Oxford Brookes University Address: Gipsy lane, OX3 0BP Email: adelextrat@brookes.ac.uk ORCID: 0000-0003-0876-6775 B. Associate or Co-investigator Contact Information Name: Clare Shaw Institution: Oxford Brookes University Address: Gipsy lane, OX3 0BP Email: clareshaw@brookes.ac.uk C. Alternate Contact Information Name: Dr Mark Williams Institution: Oxford Brookes University Address: Gipsy lane, OX3 0BP Email: Williams.m@brookes.ac.uk 3. Date of data collection (single date, range, approximate date): 2022/10/01 to 2023/02/14 4. Geographic location of data collection: Oxford, UK. 5. Information about funding sources that supported the collection of the data: No external funding SHARING/ACCESS INFORMATION 1. Licenses/restrictions placed on the data: Creative Commons Licence BY-NC-ND 4.0. 2. Links to publications that cite or use the data: Preprint available at https://doi.org/10.20944/preprints202308.2078.v1. Anticipated publication in the journal “Healthcare”. 3. Links to other publicly accessible locations of the data: N/A 4. Links/relationships to ancillary data sets: N/A 5. Was data derived from another source? No 6. Recommended citation for this dataset: Delextrat, A., Shaw, C., and Williams, M. (2023) Patient Demographics for The role of strength-related factors on psychological readiness for return to sport following Anterior Cruciate Ligament (ACL) reconstruction [dataset]. DOI: 10.24384/13gr-k634 DATA & FILE OVERVIEW 1. File List: Only one Excel file, called “Patient Demographics” 2. Relationship between files, if important: N/A 3. Additional related data collected that was not included in the current data package: Participants’ names (deidentified), details of the ACL-RSI questionnaire. 4. Are there multiple versions of the dataset? No METHODOLOGICAL INFORMATION 1. Description of methods used for collection/generation of data: The study design was cross-sectional, with participants attending the laboratory on one occasion only to perform psychological assessments first, followed by strength testing. Psychological assessment consisted in the ACL-RSI questionnaire. This questionnaire was chosen for its very good validity and reliability. In addition, its use was recommended in the 2015 consensus statement following ACLI. The total score out of 100 was recorded, and it was also used to separate participants into one group deemed not psychologically ready to return to PILOS (cases) and a group deemed psychologically ready to return to PILOS (controls). The threshold used for these groups was a total score of 81.4%, as a previous study reported an association between scores <81.4% and the inability for athletes to return to this level. Strength testing was undertaken on an isokinetic dynamometer (Biodex system 4; Biodex, Shirley, NY). A standardised warm up was implemented prior to the initiation of isokinetic testing. This consisted of 8 minutes on a Monark cycle ergometer (874E; Monark, Vanberg, Sweden) at an intensity of 100W, with three intermittent 6-s maximal effort sprints at minutes 6,7 and 8. This was followed by five body weight squats, two submaximal and three maximal counter movement jumps. After the warm-up, participants were instructed to sit upright on the chair with their hips flexed at 90°. Straps were secured to immobilise movement at the thigh, hips and trunk in order to limit the influence of extraneous joint and muscle involvement. Straps were secured at the proximal tibia from which participants would initiate/ resist movement. Alignment of the lateral femoral condyle was made with the axis of the dynamometer level arm, with the proximal lever arm secured at the lateral malleolus. Participants were tested on both operated and non-operated legs and at two angular velocities, with all these conditions randomised. The range of motion was from 0° (full knee extension) to 90° of knee flexion and participants were given verbal encouragement to provide maximal effort throughout the range. The test consisted of concentric contractions of the quadriceps and hamstrings and eccentric contraction of the hamstrings at 60°·s-1 (three repetitions) and 180°·s-1 (five repetitions). These velocities are characterised by excellent test-retest reliability (Intraclass correlation coefficients of 0.95-0.98, [30]. Each condition was preceded by a familiarisation set. 2. Methods for processing the data: The following variables were calculated as the average of the two best contractions at 60°·s-1 and the three best contractions at 180°·s-1: - Concentric peak torque of the quadriceps relative to body weight (Qcon, N.m.kg-1). - Eccentric peak torque of the hamstrings relative to body weight (Hecc, N.m.kg-1). - Peak Hecc:Qcon. - Angle-specific Hecc, Qcon and Hecc:Qcon at 10° (Hecc10, Qcon10, Hecc:Qcon10), 20° (Hecc20, Qcon20, Hecc:Qcon20), 30° (Hecc30, Qcon30, Hecc:Qcon30), and 40° (Hecc40, Qcon40, Hecc:Qcon40) from full knee extension. These were calculated as averages between 0°-10°, 11°-20°, 21°-30° and 31°-40°, respectively [31]. - Quadriceps and hamstrings rate of torque development in the first 50 ms and the first 100 ms (RTD50 and RTD100, N·m·s-1) for Hecc, Qcon and Hecc/Qcon, calculated as the ratio between the change in torque and the corresponding change in time in the first 50ms and 100 ms of contraction, respectively. The onset of contraction was defined as a torque value of 1% of the peak torque produced during the same contraction. The time windows of 50 ms and 100 ms were chosen as the best compromise between reliability and ecological validity. Indeed, ACL injuries usually occur in the first 50ms after initial ground contact. However, Mentiplay et al. [34] showed greater reliability of RFD at 100 ms than 50ms. The same time windows were previously used in similar research. - Limb symmetry index (LSI) for all parameters: = ([(operated-non-operated)/non-operated] x 100. 3. Instrument- or software-specific information needed to interpret the data: Statistical analyses were ran using IBM SPSS statistical package version 29.0. 4. Standards and calibration information, if appropriate: N/A 5. Environmental/experimental conditions: Indoors, temperatures ranging from 18-21 degrees Celsius, humidity not known. 6. Describe any quality-assurance procedures performed on the data: N/A 7. People involved with sample collection, processing, analysis and/or submission: Oliver Lee and Dr Anne Delextrat DATA-SPECIFIC INFORMATION FOR: Patient Demographics Note that sheet 1 and 2 contain similar data but are arranged differently (rows and column), the following description is for sheet 2: 1. Number of variables: 70 2. Number of cases/rows: 12 3. Variable List: -Group -Sex (M: male, F: female) -Age (years) -Sport -Graft (ham= hamstring, CTR: contralateral) -Time (injury): time since injury (months) -Time (surgery): time since surgery (months) -Time (RTS): time since return to sport (months) -Add injury?: any additional injuries (MCL: medial collateral ligament, LCL: lateral collateral ligament, M: meniscus). -ACL-RSI: Score (%) obtained for the ACL-RSI questionnaire. -IKDC: score obtained at the IKDC questionnaire (subjective scale that provides patients with an overall functional score). -Op knee: operated knee (R: right, L: left) -Weight (kg) -Height (cm) -H PT LSI: asymmetry in the peak torque developed by the hamstring It has subsections that are similar to other variables, they will be described below: -60d/s: angular velocity of 60 degrees per second on the Biodex. -PT/BW: peak torque divided by body weight -30-40D: average torque between 30 and 40 degrees of knee flexion (0 degree is full extension) -20-30D: average torque between 20 and 30 degrees of knee flexion (0 degree is full extension) -10-20D: average torque between 10 and 20 degrees of knee flexion (0 degree is full extension) -0-10D: average torque between 0 and 10 degrees of knee flexion (0 degree is full extension) -180d/s: angular velocity of 180 degrees per second on the Biodex. -Q PT LSI: asymmetry in the peak torque developed by the quadriceps -Quad 60: torque developed by the quadriceps at 60 degrees per second. -Quad 180: torque developed by the quadriceps at 180 degrees per second. -Ham 60: torque developed by the hamstrings at 60 degrees per second. -Ham 180: torque developed by the hamstrings at 180 degrees per second. -RFD LSI: asymmetry in the rate of torque development -Ham: hamstring -0-50ms: the rate of torque development is measured only between start of contraction and 50 ms. -0-100ms: the rate of torque development is measured only between start of contraction and 100 ms. -RFD True: absolute value of the rate of torque development. 4. Missing data codes: N/A 5. Specialized formats or other abbreviations used: N/A