Association between hip abductor function, rear-foot dynamic alignment, and dynamic knee valgus during single-leg squats and drop landings

Kagaya, Yoshinori; Fujii, Yasuhiro; Nishizono, Hidetsugu

doi:10.1016/j.jshs.2013.08.002

Cited by 35 publications

(32 citation statements)

References 39 publications

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“…This results correspond with previous findings regarding the benefits of frontal knee alignment for body stability (e.g. trunk control) [28]. In contrast, the lack of such learning effect in the control group could have been the result of the decrease in contact time and increase in GRF during the second jump occurring in this group between block A and C. In other words, a faster movement with higher force could be more difficult to stabilise.…”

Section: Discussionsupporting

confidence: 90%

“…The lower knee valgus, approximately 5 , in the experimental group might hold clinical relevance because excessive knee valgus has been shown to be an independent risk factor for ACL injury [14]. The verbal instructions used in this study partly aimed to direct the participants' attention toward the adjacent joints because knee valgus has been shown to be affected by displacement of the pelvis [28] and the trunk in the frontal plane [24]. The instructions were also similar to the instructions used in preventive exercises for knee injury [12].…”

Section: Discussionmentioning

confidence: 99%

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Effects of verbal knee alignment instructions on knee kinematics, kinetics and the performance of a single-leg jump in female adolescent soccer players

Grooten

Karlefur

Conradsson

2019

European Journal of Physiotherapy

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Background:Little is known about the effects of verbal instructions on the technique and performance of sports-related tasks. The aim of this study was therefore to investigate the acute effects of knee alignment instructions on knee kinematics and the performance of a single-leg jump in female adolescent soccer players. Methods: Twenty-eight adolescent female soccer players completed three blocks of 15 single-leg jumps. The participants were randomised to an experimental group receiving verbal instructions focussing on proper knee alignment (the avoidance of knee valgus) or to a control group only receiving instructions on task execution. Outcomes were knee kinematics (flexion and valgus angles) and jump performance (number of incorrect trials and contact time).Results: The experimental group demonstrated 36% less knee valgus and 11-13% greater knee flexion compared to the control group. While jump performance remained unchanged in the experimental group over the course of the experiment, the control group demonstrated a 20% decrease in the number of incorrect trials and a 25% reduction in contact time over the course of the experiment. Conclusions: The present results indicate that verbal instructions accentuating proper knee alignment benefit knee kinematics but not jump performance in adolescent female soccer athletes. ARTICLE HISTORY

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Section: Discussionsupporting

confidence: 90%

Section: Discussionmentioning

confidence: 99%

Effects of verbal knee alignment instructions on knee kinematics, kinetics and the performance of a single-leg jump in female adolescent soccer players

Grooten

Karlefur

Conradsson

2019

European Journal of Physiotherapy

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“…Studies have focused on the clinical relevance of excessive pronation during walking, which has been identified as a major factor in the development of overuse injuries and PFP [12,16]. This is usually associated with a lack of muscle strength, stability, and overuse of the foot muscles due to the oblique angle of the subtalar joint [10,17]. Insoles (foot orthoses) are a common modality employed by many clinicians with evidence indicating that they can prevent overuse conditions of lower limbs [18].…”

Section: Discussionmentioning

confidence: 99%

Influence and benefits of foot orthoses on kinematics, kinetics and muscle activation during step descent task

et al. 2018

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Medial wedged foot orthoses are frequently prescribed to reduce retropatellar stress in patients with patellofemoral pain (PFP) by controlling calcaneal eversion and internal rotation of the tibia. During activities of daily living, the highest patella loads occur during stair descent, but the effect of foot orthoses during stair descent remains unclear. The purpose of this study was to compare the kinematics, kinetics and muscle activation during a step descent task in healthy volunteers using three designs of foot orthoses (insoles). Sixteen healthy subjects with a mean age of 25.7 years, BMI of 23.3, and +5 Foot Posture Index were recruited. Subjects performed a step down task from 20 cm using a 5 o rearfoot medial wedge (R), a 5 o rearfoot and forefoot medial wedge (R/F), and a control flat insole (C). Significant improvements in control were seen in the R and R/F insoles over the C insole in the foot and at the ankle and hip kinematics. The R and R/F insoles increased the knee adduction moments, but decreased the knee internal rotation moment compared to the C insole. Adductor hallucis (AH) activity was reduced with both insoles, whereas tibialis anterior (TA) activity was reduced with the R insole only. Foot orthoses can change joint mechanics in the foot and lower limbs providing greater stability and less work done by AH and TA muscles. This data supports the use of foot orthoses to provide functional benefits during step descent, which may benefit patients with PFP.

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“…Single leg squat is a useful clinical test related to dynamic valgus and lower limb kinematics 14 , 15 ) . In this context, Crossley et al 12 ) relate a poor SLS performance to delayed onset latency of anterior gluteus medius (Gma) and posterior gluteus medius (Gmp).…”

Section: Introductionmentioning

confidence: 99%

Effect of squatting velocity on hip muscle latency in women with patellofemoral pain syndrome

Orozco-Chavez

Méndez-Rebolledo

2018

J Phys Ther Sci

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[Purpose] Neuromuscular activity has been evaluated in patellofemoral pain syndrome but movement velocity has not been considered. The aim was to determine differences in onset latency of hip and knee muscles between individuals with and without patellofemoral pain syndrome during a single leg squat, and whether any differences are dependent on movement velocity. [Subjects and Methods] Twenty-four females with patellofemoral pain syndrome and 24 healthy females participated. Onset latency of gluteus maximus, anterior and posterior gluteus medius, rectus femoris, vastus medialis, vastus lateralis and biceps femoris during a single leg squat at high and low velocity were evaluated. [Results] There was an interaction between velocity and diagnosis for posterior gluteus medius. Healthy subjects showed a later posterior gluteus medius onset latency at low velocity than high velocity; and also later than patellofemoral pain syndrome subjects at low velocity and high velocity. [Conclusion] Patellofemoral pain syndrome subjects presented an altered latency of posterior gluteus medius during a single leg squat and did not generate adaptations to velocity variation, while healthy subjects presented an earlier onset latency in response to velocity increase.

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Association between hip abductor function, rear-foot dynamic alignment, and dynamic knee valgus during single-leg squats and drop landings

Cited by 35 publications

References 39 publications

Effects of verbal knee alignment instructions on knee kinematics, kinetics and the performance of a single-leg jump in female adolescent soccer players

Effects of verbal knee alignment instructions on knee kinematics, kinetics and the performance of a single-leg jump in female adolescent soccer players

Influence and benefits of foot orthoses on kinematics, kinetics and muscle activation during step descent task

Effect of squatting velocity on hip muscle latency in women with patellofemoral pain syndrome

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