Jonathan S. Goodwin, Robert A. Creighton, Brian G. Pietrosimone, Jeffery T. Spang and J. Troy Blackburn
loading during weight-bearing activities. 6 – 8 Orthotic devices such as medial unloader knee braces and lateral wedges placed in shoes are often utilized to minimize compressive loading of the medial compartment. These devices are designed to induce valgus loading to counter compressive loading of the
Wataru Kawakami, Makoto Takahashi, Yoshitaka Iwamoto and Koichi Shinakoda
Hallux valgus is one of the most common foot deformities in women that significantly impacts foot function and quality of life. 1 Development of hallux valgus has multifactorial components. Previous studies have suggested that a number of structural factors are correlated with the development of
Irfan A. Khan and Kelley D. Henderson
Key Points ▸ Patients with medial knee osteoarthritis experienced significantly decreased levels of pain and improved levels of function when utilizing a valgus knee brace. ▸ A combination of a valgus knee brace and other orthoses may be more effective in reducing symptoms and improving function
Akihiro Tamura, Kiyokazu Akasaka and Takahiro Otsudo
Hewett et al 5 showed that female athletes with dynamic knee valgus, defined as the position or motion of the distal femur toward and distal tibia away from the midline of the body, had an increased risk of noncontact ACL injuries. Other prospective research showed that noncontact ACL injuries were more
Kai-Yu Ho, Brenda Benson Deaver, Tyrel Nelson and Catherine Turner
Single-leg landing, single-leg hopping, and cutting tests have been widely used in evaluating knee function after anterior cruciate ligament reconstruction (ACLR). 1 , 2 It has also been found that females with ACLR showed greater knee valgus, 2 thereby predisposing them to increased risk of ACL
Christopher Carcia, Jim Eggen and Sandra Shultz
The influence of hip-muscle function on knee-joint kinematics during landing has been inadequately investigated.
To determine the effect of bilateral hip-abductor fatigue on frontal-plane tibiofemoral landing characteristics and vertical ground-reaction force (vGRF) during the landing phase of a drop jump.
20 recreationally active college-age students.
Isometric bilateral hip-abductor-fatigue protocol.
Main Outcome Measures:
Frontal-plane tibiofemoral landing angle, excursion, and vGRF during landing from a drop jump under prefatigue, postfatigue, and recovery conditions.
After the fatigue protocol, participants landed in a greater valgus orientation than in the prefatigued state. No differences in frontal-plane excursion or vGRF were noted.
Isolated bilateral hip-abductor fatigue alters frontal-plane lower extremity orientation during a double-leg landing. Because an increase in valgus orientation has been observed at or near the time of noncontact anterior cruciate ligament injuries, we recommend improving hip-abductor muscle performance to lessen the risk of such injuries.
Jennifer A. Hogg, Randy J. Schmitz and Sandra J. Shultz
Functional valgus collapse has been associated with noncontact anterior cruciate ligament (ACL) injury risk in females, 1 , 2 both prospectively 1 , 3 and retrospectively. 2 , 4 It is a coupled, dual-joint, multiplanar motion composed of hip adduction and internal rotation, and knee abduction
AmirAli Jafarnezhadgero, Morteza Madadi-Shad, Christopher McCrum and Kiros Karamanidis
affect injury mechanisms by selectively preloading or unloading specific tissues ( Lerner, DeMers, Delp, & Browning, 2015 ). During movement, tibiofemoral joint malalignment often results in dynamic knee valgus ( Almeida et al., 2016 ; Ishida, Yamanaka, Takeda, & Aoki, 2014 ). Dynamic knee valgus is
Mark C. Richardson, Andrew Wilkinson, Paul Chesterton and William Evans
male counterparts. 6 The increased risk in females is likely multifaceted and may include anatomical differences and hormonal changes, 7 although an increased knee valgus position on landing is frequently cited. 8 , 9 Establishing an effective intervention to help reduce injury occurrence and