Abstract
Purpose
To investigate the effects of graft source, time since surgery, age, and sex on unilateral and symmetry-based measures of knee extension strength among individuals with ACL reconstruction (ACLR).
Methods
Three hundred and eight individuals aged 13–40 years old with primary, unilateral ACLR in the last 60 months were enrolled in this multi-site clinical measurement study. Participants completed bilateral knee extension maximal voluntary isometric contraction (MVIC) torque assessments which were normalized to body mass (Nm/kg) and limb symmetry indices (LSI) were calculated. The effects of graft source (patellar tendon autograft; hamstring tendon autograft), time since surgery (≤ 12 months; >12 mo.), age (≤ 18 years; >18 years), and sex were evaluated using separate ANCOVAs.
Results
A significant interaction was present between time since surgery and graft source for LSI (P = 0.01) as participants with patellar tendon autografts ≤ 12 months post-ACLR experienced the greatest asymmetry (LSI = 69.2 ± 24.5%). Significant interactions were present between time since surgery and sex for involved limb (P = 0.01) and uninvolved limb MVIC torque (P = 0.05) with females ≤ 12 months post-ACLR being weakest (involved MVIC = 1.81 ± 0.70 N m/kg; uninvolved MVIC = 2.40 ± 0.68 N m/kg). Participants ≤ 18-year-old displayed weaker involved limb (P < 0.001) and contralateral limb (P < 0.001) MVIC torque as compared to participants > 18-year-old during the first year after ACLR.
Conclusions
Graft source, sex, age, and time since surgery effect quadriceps strength and symmetry after ACLR. Surgical and demographic factors should be considered when developing treatment approaches to optimize quadriceps function prior to re-integration into pre-injury levels of physical activity.
Level of evidence
IV.
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Abbreviations
- ACLR:
-
Anterior cruciate ligament reconstruction
- BTB:
-
Bone–patellar tendon–bone autograft
- HAS:
-
Hamstring tendon autograft
- LSI:
-
Limb symmetry index
- MVIC:
-
Maximum voluntary isometric contraction
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Funding
Research reported in this publication was patiently supported by the National Institute of Arthritis and Musculoskeletal and Skin Diseases of the National Institutes of Health (1R03AR066840-01A1), North Carolina Translational and Clinical Sciences (TraCS) Institute and National Athletic Trainers Association Research and Education Foundation (14NewInv001 and 1617DGP007). The content is solely the responsibility of the authors and does not necessarily represent the official views of the National Institutes of Health, NC TraCS Institute or the National Athletic Trainers Association Research and Education Foundation.
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CK, BP, and JH contributed to the study design, collection of demographic and strength data, and statistical analysis. CL, MR, TB, and AL contributed to the collection and preparation of the demographic and strength data included in the final analysis. All authors read and approved the final manuscript.
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This research was approved by the University of North Carolina at Chapel Hill (IRB# 13-2385 and 13- 3228), University of Virginia (IRB# 17-399), and Michigan State University (IRB# 17-1372) Institutional Review Boards for Human Subjects or Health Science Research.
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Kuenze, C., Pietrosimone, B., Lisee, C. et al. Demographic and surgical factors affect quadriceps strength after ACL reconstruction. Knee Surg Sports Traumatol Arthrosc 27, 921–930 (2019). https://doi.org/10.1007/s00167-018-5215-9
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DOI: https://doi.org/10.1007/s00167-018-5215-9