1. Engebretsen L, Møller M, Kooy C, Yamaguchi T, Moatshe G. The gender and sex data gap in anterior cruciate ligament injuries in paediatric patients. Knee Surg Sports Traumatol Arthrosc. 2024;32(10):2500-2504. doi:10.1002/ksa.12397
2. Winkler PW, Thorolfsson B, Piussi R, et al. Sport-specific concomitant injuries, return-to-sport rates and second anterior cruciate ligament injuries in adolescents with ACL reconstruction. Br J Sports Med. 2025; 59(13):931-940. doi:10.1136/bjsports-2024-108694
3. Brenner JS, LaBella CR, Brooks MA, et al. Sports specialization and intensive training in young athletes. Pediatrics. 2016;138:3. doi:10.1542/peds.2016-2148
4. Romanchuk NJ, Livock H, Lukas KJ, Del Bel MJ, Benoit DL, Carsen S. Criteria used to determine unrestricted return to activity after ACL reconstruction in pediatric and adolescent patients: a systematic review. Orthop J Sports Med. 2023;11(3):23259671231154540. doi:10.1177/23259671231154540
5. Magill JR, Myers HS, Lentz TA, et al. Healthy pediatric athletes have significant baseline limb asymmetries on common return-to-sport physical performance tests. Orthop J Sports Med. 2021;9(1):2325967120982309. doi:10.1177/2325967120982309
6. Paterno MV, Rauh MJ, Schmitt LC, Ford KR, Hewett TE. Incidence of second ACL injuries 2 years after primary ACL reconstruction and return to sport. Am J Sports Med. 2014;42(7):1567-1573. doi:10.1177/0363546514530088
7. Taylor JB, Owen E, Ford KR. Incorporating workload measures into rehabilitation after anterior cruciate ligament reconstruction: a case report. Int J Sports Phys Ther. 2020;15(5):823-831. doi:10.26603/ijspt20200823
8. Longo UG, Villa Corta M, Valente F, et al. Skeletal maturity assessment in pediatric ACL reconstruction. Children (Basel). 2025;12(9):1186. doi:10.3390/children12091186
9. Kuenze C, Collins K, Pfeiffer KA, Lisee C. Assessing physical activity after ACL injury: moving beyond return to sport. Sports Health. 2022;14(2):197-204. doi:10.1177/19417381211025307
10. Ezzat AM, Brussoni M, Mâsse LC, Emery CA. Effect of anterior cruciate ligament rupture on physical activity, sports participation, patient-reported health outcomes, and physical function in young female athletes. Am J Sports Med. 2021;49(6):1460-1469. doi:10.1177/03635465211002530
11. Lisee CM, Montoye AHK, Lewallen NF, Hernandez M, Bell DR, Kuenze CM. Assessment of free-living cadence using ActiGraph accelerometers between individuals with and without anterior cruciate ligament reconstruction. J Athl Train. 2020;55(9):994-1000. doi:10.4085/1062-6050-425-19
12. Kuenze C, Collins K, Triplett A, et al. Adolescents are less physically active than adults after anterior cruciate ligament reconstruction. Orthop J Sports Med. 2022;10(2):23259671221075658. doi:10.1177/23259671221075658
13. Bell DR, Pfeiffer KA, Cadmus-Bertram LA, et al. Objectively measured physical activity in patients after anterior cruciate ligament reconstruction. Am J Sports Med. 2017;45(8):1893-1900. doi:10.1177/0363546517698940
14. Kuenze C, Cadmus-Bertram L, Pfeiffer KA, et al. Relationship between physical activity and clinical outcomes after ACL reconstruction. J Sport Rehabil. 2019;28(2):180-187. doi:10.1123/jsr.2017-0186
15. Manojlovic M, Roklicer R, Trivic T, et al. Objectively evaluated physical activity among individuals following anterior cruciate ligament reconstruction: a systematic review and meta-analysis. BMJ Open Sport Exerc Med. 2024;10:1. doi:10.1136/bmjsem-2023-001682
16. Werner DM, Golightly YM, Rosenthal MD, et al. Relationship between changes in physical activity and knee health 18 months after ACL reconstruction. Med Sci Sports Exerc. 2025;57(11):2460-2467. doi:10.1249/MSS.0000000000003787
17. Romero-Padron MA, Fuentes-Rivera Tau L, Jorgensen A, Tao MA, Wellsandt EA. Body-weight changes and physical activity after anterior cruciate ligament reconstruction. J Athl Train. 2026;61(3):223-230. doi:10.4085/1062-6050-0124.25
18. Chomistek AK, Yuan C, Matthews CE, et al. Physical activity assessment with the ActiGraph GT3X and doubly labeled water. Med Sci Sports Exerc. 2017;49(9):1935-1944. doi:10.1249/MSS.0000000000001299
19. Montoye AHK, Moore RW, Bowles HR, Korycinski R, Pfeiffer KA. Reporting accelerometer methods in physical activity intervention studies: a systematic review and recommendations for authors. Br J Sports Med. 2018;52(23):1507-1516. doi:10.1136/bjsports-2015-095947
20. Filbay SR, Sonesson S, Kuster RP, Grooten WJA, Kvist J. Accelerometer-assessed physical activity levels 32-37 years after anterior cruciate ligament rupture: does initial treatment strategy or the presence of osteoarthritis matter? J Sci Med Sport. 2025;28(10):813-820. doi:10.1016/j.jsams.2025.05.001
21. Wellsandt E, Werner D, Tao M, Michaud K, Wichman C, Golightly YM. Physical activity and sedentary behavior differ by sex during the first six months after anterior cruciate ligament reconstruction. Med Sci Sports Exerc. 2025;57(8):1617-1625. doi:10.1249/MSS.0000000000003714
22. Shephard RJ. The objective monitoring of physical activity. Prog Prev Med. 2017;2:4. doi:10.1097/pp9.0000000000000007
23. Kuenze C, Lisee C, Pfeiffer KA, et al. Sex differences in physical activity engagement after ACL reconstruction. Phys Ther Sport. 2019;35:12-17. doi:10.1016/j.ptsp.2018.10.016
24. Armitano CN, Morrison S, Russell DM. Upper body accelerations during walking are altered in adults with ACL reconstruction. Gait Posture. 2017;58:401-408. doi:10.1016/j.gaitpost.2017.08.034
25. Toomey CM, Whittaker JL, Doyle-Baker PK, Emery CA. Does a history of youth sport-related knee injury still impact accelerometer-measured levels of physical activity after 3-12 years? Phys Ther Sport. 2022;55:90-97. doi:10.1016/j.ptsp.2022.03.003
26. Fabricant PD, Brusalis CM, Schachne JM, et al. Which metrics are being used to evaluate children and adolescents after ACL reconstruction? A systematic review. Arthrosc Sports Med Rehabil. 2020;2:4. doi:10.1016/j.asmr.2020.04.006
27. Forrester LA, Schweppe EA, Popkin CA. Variability in rehabilitation protocols following pediatric anterior cruciate ligament reconstruction. Phys Sportsmed. 2019;47(4):448-454. doi:10.1080/00913847.2019.1622472
28. Davies WT, Myer GD, Read PJ. Is it time we better understood the tests we are using for return to sport decision making following ACL reconstruction? A critical review of the hop tests. Sports Med. 2020;50(3):485-495. doi:10.1007/s40279-019-01221-7
29. Pauw AHJ, Buck TMF, Gokeler A, Tak IJR. Reconsideration of return-to-sport decision-making after pediatric ACL injury: a scoping review. Sports Health. 2023;15(6):898-907. doi:10.1177/19417381221146538