ArticleBMC sports science, medicine & rehabilitation2018
Angle-specific analysis of isokinetic quadriceps and hamstring torques and ratios in patients after ACL-reconstruction.
Article in BMC sports science, medicine & rehabilitation, 2018. The graph could read no effect estimate from its abstract, so it casts no vote on the map. It is linked to trial NCT05041400 (Distribution of Knee Isokinetic Angle-specific Moments and Ratios), which is not on this map. Cited by 23 papers, 1 of them a synthesis that pooled it.
What it found
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
Distribution of Knee Isokinetic Angle-specific Moments and Ratios: Searching for Normative Values in Healthy Subjects
Who cites it
23 citing papers in PubMed, 1 synthesis or guideline pooled it.
- Is hamstrings-to-quadriceps torque ratio useful for predicting anterior cruciate ligament and hamstring injuries? A systematic and critical review.Journal of sport and health science · 2023Pooled it
- Improved Strength Recovery and Reduced Fatigue with Suppressed Plasma Myostatin Following Supplementation of aNutrients · 2023Trial
- Angle-Matched Isometric and Isokinetic Hamstring-to-Quadriceps Ratios Are Not Directly Interchangeable: An Exploratory Multi-Angle Dynamometry Study.Bioengineering (Basel, Switzerland) · 2026Article
- Muscular profiles of adolescent female soccer players: a cross-sectional comparison of hamstring-to-quadriceps and vastus medialis-to-vastus lateralis characteristics.Journal of orthopaedic surgery and research · 2026Article
- Wearable sensor assessment of neuromuscular latency: revealing the strength-timing trade-off in female soccer.BMC sports science, medicine & rehabilitation · 2026Article
- Biomechanical asymmetry during side-cutting is associated with lower limb muscle strength after anterior cruciate ligament reconstruction.BMC musculoskeletal disorders · 2026Article
- Serial Changes in Knee Muscle Strength and Functional Performance After Anterior Cruciate Ligament Reconstruction: A Retrospective Cohort Study of 107 Patients.Medicina (Kaunas, Lithuania) · 2026Article
- Isokinetic vs. Hand-Held Dynamometry for Assessing Knee Flexor and Extensor Strength in Athletes: Evaluating a Low-Cost Alternative across the Range of Motion.Journal of human kinetics · 2026Article
- Interpretable Machine Learning on Simulation-Derived Biomechanical Features for Hamstrings-Quadriceps Imbalance Detection in Running.Sports (Basel, Switzerland) · 2025Article
- Early Open Kinetic Chain Hamstring Exercise After ACL Reconstruction: A Retrospective Safety and Efficacy Study.Journal of clinical medicine · 2025Article
- Impact of Hamstring Graft on Hamstring Peak Torque and Maximum Effective Angle After Anterior Cruciate Ligament Reconstruction: An Exploratory and Preliminary Study.Bioengineering (Basel, Switzerland) · 2025Article
- Hamstrings and Quadriceps Weaknesses Following Anterior Cruciate Ligament Reconstruction Persist Up to 6 Months After Return-to-Sport: An Angle-specific Strength Analysis.International journal of sports physical therapy · 2025Article
- Normative isokinetic knee strength values and prediction models in non-athletic Chinese adults.Frontiers in bioengineering and biotechnology · 2025Article
- Prediction of specific structural damage to the knee joint using qualitative isokinetic analysis.BMC musculoskeletal disorders · 2024Article
- Isometric and isokinetic strength of lower-limb muscles in female athletes during different phases of menstrual cycle: a causal-comparative study.BMC women's health · 2023Article
- Beyond peak torque: Longitudinal analysis of angle-specific isokinetic knee torques in collegiate athletes post-ACLR.Physical therapy in sport : official journal of the Association of Chartered Physiotherapists in Sports Medicine · 2023Article
- Brace-Free Rehabilitation after Isolated Anterior Cruciate Ligament Reconstruction with Hamstring Tendon Autograft Is Not Inferior to Brace-Based Rehabilitation-A Randomised Controlled Trial.Journal of clinical medicine · 2023Article
- Ecological and Specific Evidence-Based Safe Return To Play After Anterior Cruciate Ligament Reconstruction In Soccer Players: A New International Paradigm.International journal of sports physical therapy · 2023Article
- Hamstrings force-length relationships and their implications for angle-specific joint torques: a narrative review.BMC sports science, medicine & rehabilitation · 2022Review
- Low to moderate risk of nerve damage during peroneus longus tendon autograft harvest.Knee surgery, sports traumatology, arthroscopy : official journal of the ESSKA · 2022Article
Corrections and comments
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Authors and funding
5 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
backgroundStrength deficits, muscle imbalances, and quadriceps inhibition are common after the surgical reconstruction of the anterior cruciate ligament (ACL), even after the patient's returned-to-sport. Typically, asymmetries between the operated and non-operated leg as well as the hamstring/quadriceps (HQ) ratio are calculated using maximum isokinetic torque values. Moreover, the knee flexion angles, which correspond to the measured torque values, were not considered. Therefore, the aim of the study was to evaluate the usage of an angle-specific approach for the analysis of isokinetic data in patients after an ACL-reconstruction.
methodsA cross-sectional laboratory study design was used to investigate the influence of leg (operated vs. non-operated) and two velocities on angle-specific isokinetic data. Concentric quadriceps and hamstring torques and ratios of 38 patients were assessed 6.6 months after ACL-reconstruction with a hamstring tendon graft. At a velocity of 60°/s and 180°/s, angle-specific torques and HQ-ratios were analyzed with conventional discrete parameters and a Statistical Parametric Mapping procedure, which evaluates continuous data. The relationship between angle-specific and conventional HQ-ratios was evaluated with Pearson correlation coefficients.
resultsAngle-specific torques and HQ-ratios were different between the operated and non-operated leg and between velocities. In the operated leg, the quadriceps deficit was higher at 60°/s in knee flexion angles > 50°. The HQ-ratios decreased with greater knee flexion at both velocities, but with a different magnitude. Around 30°, the HQ-ratios reached 1.0 and did not differ between the velocities, while leg differences were present from 40 to 60°. At the higher testing velocity, the maximum flexion torque occurred at greater knee flexion, whereas the maximum extension torque were present at a similar joint angle. The correlation coefficients between conventional and angle-specific HQ-ratios were low in knee angles < 35° and > 65° and varied according to leg and velocity.
conclusionsThe angle specific approach is recommended for future ACL-research, as it reveals strength deficits and imbalances, which were not captured by conventional parameters. The results provide a rationale for more specific joint angle and/or velocity based training and may help for return-to-sport decisions.
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