Protective Knee Braces and the Biomechanics of the Half-Squat Parachute Landing

Wu, Di; Zheng, Chao; Wu, Ji; Wang, Longfeng; Xiang, Wei; Wang, Lizheng

doi:10.3357/amhp.4887.2018

Cited by 13 publications

(35 citation statements)

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“…In Britain, Australia, Germany, and other developed countries, internal ankle support was widely used by paratroopers as necessary protective equipment [2,8,16]. Although air-filled ankle braces, EVC foam braces, and high-elastic-fiber ankle socks had been developed successively in China, no relevant report exists on whether or not they can effectively prevent ankle injuries [2,3,5,17]. According to the epidemiological survey and preliminary biomechanical research conducted for this study, the injury mechanism was found to be excessive dorsiflexion and inversion of the ankle joint during HSPL, and it was also found that wearing ankle braces can effectively restrict ankle joint motion stability on the sagittal and coronal planes [2,5].…”

Section: Discussionmentioning

confidence: 99%

“…Landing injuries are the most frequent of all parachuting injuries and ankle joint injuries are the most common landing injury [1]. The half-squat parachute landing (HSPL) posture has been adopted by Chinese paratroops [2,3]. When compared with the sideways roll parachute landing fall, the HSPL method may reduce the probability of asynchronous landings on either the left or right foot [4].…”

Section: Introductionmentioning

confidence: 99%

“…Bilateral knees, medial malleoli, and feet are kept tight, and the feet should be parallel with the ground [5]. HSPL is characterized by actively and deeply flexing the joints of the lower-extremities after initial contact, thereby prolonging impact absorption by the body segments and preventing potential injury [2,3,5].…”

Section: Introductionmentioning

confidence: 99%

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A novel prophylactic parachute ankle brace CPAB

Zhou

et al. 2020

Preprint

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Background: Comparing the effects of a self-designed and self-manufactured novel prophylactic ankle brace (Chinese parachute ankle brace, CPAB) and two ordinary ankle braces on the ankle joint during a half-squat parachute landing via biomechanical assessment.Methods: Twenty elite paratroopers were in four different conditions: no brace, elastic brace, semi-rigid brace, and CPAB. Each participant was instructed to jump off a platform with three different heights, 40 cm, 80 cm, and 120 cm, and land on the AMTI force plate in a half-squat posture. The vertical ground reaction forces (vGRF), joint angles, moments, powers, and works were calculated. After the experiment, every participant completed the questionnaires designed for this study.Result: Increasing the dropping height increased all of the parameters significantly (P<0.01), except for time to peak vGRF (T-PvGRF). Applying three braces can all slightly increase vGRF (P=0.237) and reduce T-PvGRF by 6-10 ms, as well as decrease the joint angles, velocities, and moments on the sagittal and coronal planes. Wearing CPAB and a semi-rigid brace more efficiently restricted dorsiflexion and inversion (P<0.05), and they both significantly reduced ankle work (t=5.107, P<0.01; t=3.331, P<0.01) and peak power (t=7.237, P<0.01; t=6.711, P<0.01) at 120 cm. The total scores from low-to-high were semi-rigid brace (19.20±2.99), elastic brace (21.91±3.25), and CPAB (23.37±3.08).Conclusion: The CPAB was more effective at restricting ankle joint motion on the coronal and sagittal planes than the other two prophylactic ankle braces. Therefore, the CPAB had the advantages of a novel appearance, high efficiency, and superior comfort, providing a reliable choice for parachute jumping and training in China.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A novel prophylactic parachute ankle brace CPAB

Zhou

et al. 2020

Preprint

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“…Estudios más recientes, como el realizado por Wu y otros (Wu et al, 2018), encontraron que al usar un brace de rodilla (un dispositivo para estabilizar la articulación y no cargarla en fases de aterrizaje) la disminución de las fuerzas de reacción (FRP), medidas con una plataforma de fuerza a diferentes alturas, no fueron estadísticamente significativas. Para este estudio se usaron diferentes tipos de brace, cada uno con una rigidez diferente.…”

Section: Marco Teóricounclassified

Perfil neuromuscular del tren inferior en cadetes que realizan curso paracaidismo militar

Triana

Rivas

Ríos

et al. 2021

Brújula semilleros investig.

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Algunos estudios han mostrado una tasa de lesión en miembros inferiores de 2 por cada 1000 saltos realizados en el paracaidismo militar. Por tal razón, se requiere una buena estabilidad de rodilla y tobillo, con una adecuada distribución de las cargas y energía cinética en el momento del contacto con el suelo. El objetivo del presente artículo es identificar los efectos del curso de paracaidismo militar en el acondicionamiento neuromuscular del tren inferior. La metodología utilizada en el estudio es observacional-descriptiva, e incluye la evaluación de 40 cadetes de género masculino mediante test de salto contramovimiento (CMJ). Los resultados revelan cambios en el acondicionamiento neuromuscular que se podrían deber a fatiga muscular o modificación propios del entrenamiento recibidos en el curso.

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“…Therefore, [12] made a study about the use of ankle braces to avoid the injuries which will also reduce the budget cost of hospitalisation. In addition, ACL injury at the knee joint regularly happened when parachutists bent over during landing, hence [13] suggested the use of semi-rigid knee brace to reduce knee injuries. A good technique during landing is called "prepare to land attitude" where the flexion of ankles and knees must be less than 45 • and the knee flexion must not exceed 130 • to avoid ACL injury [10].…”

Section: Introductionmentioning

confidence: 99%

Kinetics Study in Parachute Landing Fall Technique by Comparing Professional and Amateur Malaysian Army Parachutists Using Kane’s Method

et al. 2020

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This paper discusses the torque data during Parachute Landing Fall (PLF) activity on the sagittal plane by applying Kane’s method. The value of torque is determined in order to identify the movement of extension and flexion at every joint-segment on the parachutist during landing. Data were obtained from three professional and eighteen amateur parachutists, each with three consecutive landings. Quintic Biomechanics Software v26 was selected to capture motion analysis. The mathematical model for the PLF technique was presented based on a two-link kinematics open chain in a two-dimensional space using Kane’s method. The t-test result showed the p-value of torque at each joint between professionals and amateurs (p ≤ 0.05). According to the torque result, the professional parachutists extended their arm then flexion their elbow, shoulder, hip, knee and the ankle plantar flexion during the foot strike phase. The professional demonstrated a perfect PLF technique by identifying the flexion and extension on each joint segment that was involved during landing activity. The value of torque at each joint segment from professional parachutists may be used as a guideline for amateurs to perform optimal landing and minimise the injury.

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Protective Knee Braces and the Biomechanics of the Half-Squat Parachute Landing

Cited by 13 publications

References 0 publications

A novel prophylactic parachute ankle brace CPAB

A novel prophylactic parachute ankle brace CPAB

Perfil neuromuscular del tren inferior en cadetes que realizan curso paracaidismo militar

Kinetics Study in Parachute Landing Fall Technique by Comparing Professional and Amateur Malaysian Army Parachutists Using Kane’s Method

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