Search Results

You are looking at 91 - 100 of 778 items for :

Clear All
Restricted access

Justine J. Reel, Leslie Podlog, Lindsey Hamilton, Lindsey Greviskes, Dana K. Voelker and Cara Gray

) qualitative investigation of female figure skaters, we adopted a social constructivist stance to view the experiences of female professional dancers through a lens of a phenomenon highly influenced by environmental and cultural factors. This approach was used to give voice to participants and enable them to

Restricted access

Jan Andrysek, Susan Klejman and John Kooy

The goal of this study was to investigate clinically relevant biomechanical conditions relating to the setup and alignment of knee-ankle-foot orthoses and the influence of these conditions on knee extension moments and orthotic stance control during gait. Knee moments were collected using an instrumented gait laboratory and concurrently a load transducer embedded at the knee-ankle-foot orthosis knee joint of four individuals with poliomyelitis. We found that knee extension moments were not typically produced in late stance-phase of gait. Adding a dorsiflexion stop at the orthotic ankle significantly decreased the knee flexion moments in late stance-phase, while slightly flexing the knee in stance-phase had a variable effect. The findings suggest that where users of orthoses have problems initiating swing-phase flexion with stance control orthoses, an ankle dorsiflexion stop may be used to enhance function. Furthermore, the use of stance control knee joints that lock while under flexion may contribute to more inconsistent unlocking of the stance control orthosis during gait.

Restricted access

Adam M. Fullenkamp, Danilo V. Tolusso, C. Matthew Laurent, Brian M. Campbell and Andrea E. Cripps

), there were a number of significant findings with regard to angular kinematics in the sagittal plane (no differences were observed for Ab/Ab or I/E motions). Figure  1 depicts significant increases in hip-flexion angle during NMT walking compared to OG for a period in late stance, as well as a period

Restricted access

Nicole J. Chimera and Mallorie Larson

The lower quarter Y-Balance Test (YBT-LQ) is a clinical movement screening test aimed at assessing dynamic balance. The YBT-LQ utilizes unilateral stance while reaching in 3 reach directions: anterior, posteromedial, and posterolateral to assess both a composite reach score and asymmetry assessment

Restricted access

Tzu-Chieh Liao, Joyce H. Keyak and Christopher M. Powers

corresponding to the individual subject’s maximum knee flexion angle during the stance phase of running (average: 40.7° [4.7]°) in a supine position. Quadriceps muscle morphology was assessed from axial plane MR images of the thigh using a 3-D spoiled gradient-recalled echo protocol (repetition time: 10.1 ms

Restricted access

Alberto Pardo-Ibáñez, Jose L. Bermejo, Sergio Gandia, Julien Maitre, Israel Villarrasa-Sapiña, Isaac Estevan and Xavier Garcia-Masso

adolescence (i.e., between 13 and 17 years old) through the analysis of COP signals. First of all, our results found different postural control between subjects of 13–14 years old and older adolescents. Furthermore, a critical change was found in sensory reweighting during the bipedal stance with manipulation

Restricted access

Simon A. Feros, Warren B. Young and Brendan J. O’Brien

respect to the stance of a live batter and the bounce of the new ball. The batter “took guard” on the line of middle stump and stood with feet parallel and either side of the popping crease. A live batter was included for 2 primary reasons: to provide specific cues for the bouncer (short-pitched delivery

Restricted access

Lachlan E. Garrick, Bryce C. Alexander, Anthony G. Schache, Marcus G. Pandy, Kay M. Crossley and Natalie J. Collins

force vector is medial to the knee joint center throughout stance, hence an external knee adduction moment (KAM) is generated. However, with excessive dynamic knee valgus, the ground reaction force vector may (in extreme cases) shift lateral to the knee joint center in the frontal plane, thereby

Restricted access

Mason D. Smith and David R. Bell

Context:

Anterior cruciate ligament (ACL) reconstruction is the standard of care for individuals with ACL rupture. Balance deficits have been observed in patients with ACL reconstruction (ACLR) using advanced posturography, which is the current gold standard. It is unclear if postural-control deficits exist when assessed by the Balance Error Scoring System (BESS), which is a clinical assessment of balance.

Objective:

The purpose of this study is to determine if postural-control deficits are present in individuals with ACLR as measured by the BESS.

Participants:

Thirty participants were included in this study. Fifteen had a history of unilateral ACLR and were compared with 15 matched controls.

Interventions:

The BESS consists of 3 stances (double-limb, single-limb, and tandem) on 2 surfaces (firm and foam). Participants begin in each stance with hands on their hips and eyes closed while trying to stand as still as possible for 20 s.

Main Outcome Measures:

Each participant performed 3 trials of each stance (18 total), and errors were assessed during each trial and summed to create a total score.

Results:

We observed a significant group × stance interaction (P = .004) and a significant main effect for stance (P < .001). Post hoc analysis revealed that the ACLR group had worse balance on the single-leg foam stance than did controls. Finally, the reconstructed group had more errors when total BESS score was examined (P = .02).

Conclusions:

Balance deficits exist in individuals with ACLR as measured by the BESS. Total BESS score was different between groups. The only condition that differed between groups was the single-leg stance on the unstable foam surface.

Restricted access

Fatemeh Azadinia, Ismail Ebrahimi-Takamjani, Mojtaba Kamyab, Morteza Asgari and Mohamad Parnianpour

.1016/j.clinbiomech.2009.05.004 10.1016/j.clinbiomech.2009.05.004 Della Volpe , R. , Popa , T. , Ginanneschi , F. , Spidalieri , R. , Mazzocchio , R. , & Rossi , A. ( 2006 ). Changes in coordination of postural control during dynamic stance in chronic low back pain patients . Gait & Posture