Article
Sport Sciences
Tyler J. Collings, Laura E. Diamond, R. O. D. S. Barrett, Ryan G. Timmins, Jack T. Hickey, William S. Du Moulin, Morgan D. Williams, Kate A. Beerworth, Matthew N. Bourne
Summary: This study found that preseason field-based tests can predict future noncontact ACL injuries in elite female footballers. Prior ACL injuries, a lower isometric hip adductor to abductor strength ratio, greater CMJ peak take-off force, and greater single-leg triple vertical hop average dynamic knee valgus and ipsilateral trunk flexion were independently associated with an increased risk of subsequent ACL injury.
MEDICINE & SCIENCE IN SPORTS & EXERCISE
(2022)
Review
Environmental Sciences
Ali Mohammed Alzahrani, Msaad Alzhrani, Saeed Nasser Alshahrani, Wael Alghamdi, Mazen Alqahtani, Hosam Alzahrani
Summary: The association between hip muscle strength and dynamic knee valgus (DKV) is currently conflicting, with different studies showing varied results. Future research should interpret these findings cautiously, and use more rigorous methods to investigate the relationship between hip muscle strength and DKV in healthy adults.
INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH
(2021)
Review
Engineering, Biomedical
Yu Song, Ling Li, Gerwyn Hughes, Boyi Dai
Summary: This narrative review summarized trunk motion and external trunk perturbation observed in ACL injury videos, and reviewed the association between trunk motion and ACL loading variables in controlled jump-landing and cutting tasks in non-injured populations.
SPORTS BIOMECHANICS
(2023)
Article
Orthopedics
Namwoong Kim, Sae Yong Lee, Sung-Cheol Lee, Adam B. Rosen, Terry L. Grindstaff, Brian A. Knarr
Summary: This study aimed to investigate the impact of hip abductor fatigue-induced weakness on ACL loading, lower extremity muscle forces, and lower extremity biomechanics during single-leg landing. While no significant differences were found in knee joint angles and ACL loading pre and post-fatigue, there were significant differences in lateral trunk flexion angle, total excursion of trunk, muscle forces, and joint moments due to fatigue.
Article
Orthopedics
Huijuan Shi, Shuang Ren, Hongshi Huang, Hui Liu, Zixuan Liang, Yuanyuan Yu, Hanjun Li, Yingfang Ao
Summary: Individuals with anterior cruciate ligament (ACL) reconstruction show altered knee biomechanics and thigh muscle strength during side-cutting compared with healthy controls. The reconstructed leg exhibits asymmetries in knee movement compared with the contralateral leg.
AMERICAN JOURNAL OF SPORTS MEDICINE
(2022)
Article
Rehabilitation
Kyndell R. Crowell, Ryan D. Nokes, Nicole L. Cosby
Summary: The studies demonstrated that weakened hip abduction and external rotation strength contribute to increased dynamic knee valgus during single-leg landing tasks. Strengthening hip abduction, extension, and external rotation can decrease dynamic knee valgus and reduce the risk of knee injury.
JOURNAL OF SPORT REHABILITATION
(2021)
Article
Sport Sciences
Boyi Dai, Jacob S. Layer, Nicole M. Bordelon, Meghan L. Critchley, Sydne E. LaCroix, Ana C. George, Ling Li, Jeremy D. Ross, Megan A. Jensen
Summary: The study aimed to quantify the impact of ACL injury on balance and jump-landing performance, as well as bilateral asymmetries. It found that athletes with ACL injuries had decreased performance and increased asymmetries post-ACLR, which may contribute to high rates of ACL re-injury. Baseline assessments could be useful in understanding pre-injury performance levels.
RESEARCH IN SPORTS MEDICINE
(2021)
Review
Sport Sciences
Yu Song, Ling Li, Boyi Dai
Summary: Trunk strength, endurance, and dynamic control can impact ACL injury rates during athletic tasks, with deficits in trunk flexion/extension strength identified as a risk factor. Training programs should target these components, with an emphasis on dynamic control to improve trunk and knee movements related to decreased ACL loading. More research is needed to fully understand the relationship between trunk neuromuscular functions and ACL injury risks.
STRENGTH AND CONDITIONING JOURNAL
(2022)
Article
Orthopedics
Volker Musahl, Ehab M. Nazzal, Gian Andrea Lucidi, Rafael Serrano, Jonathan D. Hughes, Fabrizio Margheritini, Stefano Zaffagnini, Freddie H. Fu, Jon Karlsson
Summary: The trend in the orthopedic community is to individualize treatment based on patient anatomy, with a focus on improving outcomes and preventing graft impingement in ACL reconstruction. Studies show that anatomical tunnel placement and management of concomitant knee injuries are crucial for better clinical results for ACL-injured patients.
KNEE SURGERY SPORTS TRAUMATOLOGY ARTHROSCOPY
(2022)
Article
Orthopedics
Francesco Della Villa, Filippo Tosarelli, Rocco Ferrari, Alberto Grassi, Luca Ciampone, Gianni Nanni, Stefano Zaffagnini, Matthew Buckthorpe
Summary: Most ACL injuries in professional male rugby players occur through a noncontact or indirect contact mechanism (68%). Three situational patterns were described, including offensive change of direction, being tackled, and pressing/tackling. Biomechanical analysis confirmed a multiplanar mechanism, with a knee-loading pattern in the sagittal plane accompanied by dynamic valgus. As most injuries occurred in the first 40 minutes, accumulated fatigue appears not to be a major risk factor for ACL injury.
ORTHOPAEDIC JOURNAL OF SPORTS MEDICINE
(2021)
Review
Multidisciplinary Sciences
Farhah Nadhirah Aiman Sahabuddin, Nazatul Izzati Jamaludin, Nurul Hidayah Amir, Shazlin Shaharudin
Summary: This systematic review looked at the effects of exercise intervention targeting specific knee-joint muscles within either the bottom-up or top-down kinetic chain on reducing excessive dynamic knee valgus (DKV). The results showed that these exercises were effective in minimizing DKV formation, which could assist in preventing lower limb injuries.
Article
Orthopedics
Kyohei Nishida, Caiqi Xu, Tom Gale, William Anderst, Freddie Fu
Summary: This study found that women had greater knee abduction angle and ACL relative elongation than men during various activities, making them more susceptible to ACL injury. The differences in kinematics were minimal, while the differences in ACL relative elongation were relatively stable. These results provide valuable information for identifying abnormal knee kinematics and ACL elongation in athletes after ACL injury.
JOURNAL OF ORTHOPAEDIC RESEARCH
(2022)
Article
Orthopedics
Esmaeil Mozafaripour, Foad Seidi, Hooman Minoonejad, Mohammad Bayattork, Fatemeh Khoshroo
Summary: This study investigated the effectiveness of comprehensive corrective exercise program (CCEP) on lower extremity kinematics and muscle strength in patients with dynamic knee valgus (DKV). The results showed significant improvements in knee valgus and muscle strength after the CCEP. It is recommended that a comprehensive approach should be adopted to simultaneously address proximal and distal segments to improve DKV.
BMC MUSCULOSKELETAL DISORDERS
(2022)
Article
Rehabilitation
Farhah Nadhirah Aiman Sahabuddin, Nazatul Izzati Jamaludin, Nurul Azuar Hamzah, Chuen Leang Chok, Shazlin Shaharudin
Summary: This study compared the effects of four-week hip- and ankle-focused exercises on lower limb mechanics during single-leg squat (SLS) in physically active females. The results showed that the hip exercise group demonstrated increased knee and ankle moment, as well as greater hip flexion angle during SLS. However, no significant changes were observed in other variables.
PHYSICAL THERAPY IN SPORT
(2022)
Article
Engineering, Biomedical
Carla van der Merwe, Sarah P. Shultz, G. Robert Colborne, Kim Hebert-Losier, Philip W. Fink
Summary: The coupling relationship between the calcaneus and shank may affect the rotational movement of the shank, which is associated with ACL injury risk during unanticipated change of direction tasks.
SPORTS BIOMECHANICS
(2023)
Article
Sport Sciences
Carolyn M. Meinerz, Philip Malloy, Christopher F. Geiser, Kristof Kipp
JOURNAL OF ATHLETIC TRAINING
(2015)
Article
Sport Sciences
Kristof Kipp, Michael T. Kiely, Christopher F. Geiser
JOURNAL OF STRENGTH AND CONDITIONING RESEARCH
(2016)
Article
Sport Sciences
Kristof Kipp, Chad Harris
JOURNAL OF STRENGTH AND CONDITIONING RESEARCH
(2017)
Article
Engineering, Biomedical
Kristof Kipp, Carolyn Meinerz
SPORTS BIOMECHANICS
(2017)
Article
Sport Sciences
Kristof Kipp, Chad Harris
JOURNAL OF SPORTS SCIENCES
(2015)
Article
Orthopedics
Philip Malloy, Alexander Morgan, Carolyn Meinerz, Christopher Geiser, Kristof Kipp
KNEE SURGERY SPORTS TRAUMATOLOGY ARTHROSCOPY
(2015)
Article
Orthopedics
Hoon Kim, Kristof Kipp
JOURNAL OF ORTHOPAEDIC RESEARCH
(2019)
Review
Engineering, Biomedical
Marcos A. Soriano, Kristof Kipp, Jason P. Lake, Timothy J. Suchomel, Pedro J. Marin, Maria P. Sainz De Baranda, Paul Comfort
Summary: The assessment of mechanical power production is crucial for researchers and practitioners. This article compares different methods (GRF, kinematic, and combined) used to assess power production in weightlifting exercises. The methods have inherent differences in data analysis and measurement systems, suggesting that they cannot be used interchangeably. The use of GRF is recommended for assessing power production applied to the system mass, while the kinematic method is more suitable for assessing power applied to the barbell.
SPORTS BIOMECHANICS
(2023)
Article
Biophysics
Hoon Kim, Riann Palmieri-Smith, Kristof Kipp
Summary: People with chronic ankle instability (CAI) exhibit greater anterior shear forces during an unanticipated cutting task compared to healthy controls (CON), with differences in early stance arising from greater ground reaction force (GRF) contribution and in late stance from increased activation of specific lower leg muscles.
JOURNAL OF BIOMECHANICS
(2021)
Article
Sport Sciences
Archit Navandar, Kristof Kipp, Enrique Navarro
Summary: This study used principal component analysis (PCA) to extract movement patterns from hip and knee angle data and found that better kicking performance in male soccer players was associated with specific hip movements, while there were no significant correlations between ball velocity and hip and knee kinematics in female players.
JOURNAL OF SPORTS SCIENCES
(2022)
Article
Engineering, Biomedical
Nayun Ahn, Hoon Kim, John Krzyszkowski, Stuart Roche, Kristof Kipp
Summary: This study aimed to determine the associations and differences between the traditional dynamic strength index (DSIGRF) and joint-level dynamic strength indices (DSINJM). The results showed that only the hip DSINJM was correlated with DSIGRF, and athletes exhibited significantly greater DSINJM than DSIGRF. Therefore, using the ratio of peak NJM during the CMJ and IMTP may not provide intuitive or useful data.
SPORTS BIOMECHANICS
(2022)
Article
Engineering, Biomedical
Kristof Kipp, John Warmenhoven
Summary: Research in sports biomechanics often uses ordinary least squares (OLS) regression, but this method can be problematic due to high-dimensional data sets. Statistical learning methods, such as regularised regression models, offer an alternative by shrinking regression coefficients, protecting against overfitting, and improving variable selection. These models have been successfully applied in biomechanics research to reduce variables and identify key predictors of performance. Sports biomechanists should consider using regularised regression models, but should also carefully consider their assumptions and limitations.
SPORTS BIOMECHANICS
(2022)