A New Perspective on the Walking Margin of Stability

Terry, Kevin; Stanley, Christopher J.; Damiano, Diane L.

doi:10.1123/jab.2014-0089

Cited by 18 publications

(20 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Computing the margin of stability. Two versions of the MoS index were calculated according to the original definition 9 (MoS Hof ) and to the modified one 16 (MoS Terry ), in both ML and AP directions at midstance for each of the stance phases recorded.…”

Section: Dynamic Balance Parameters During Overground Gaitmentioning

confidence: 99%

“…This quantity has been called the ''extrapolated CoM'' (XCoM). The MoS, which can be calculated only during the single limb support phase, 9,16 consists of the spatial distance between the XCoM and the limits of the BoS, constituted by the position of the foot of the trailing leg during its single limb support phase (i.e. mid-stance).…”

Section: Introductionmentioning

confidence: 99%

“…mid-stance). More recently, Terry et al 16 proposed a modified MoS that further extend the one formulated by Hof et al Following this adjusted model, the limits of the BoS are no more fixed during the stance phase, but are instead defined by the position and velocity of the CoP. The limit of stability is therefore defined by the ''extrapolated CoP'' (XCoP).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Measures of dynamic balance during level walking in healthy adult subjects: Relationship with age, anthropometry and spatio-temporal gait parameters

Lencioni

Carpinella

Rabuffetti

et al. 2019

Proc Inst Mech Eng H

View full text Add to dashboard Cite

The maintenance of balance in dynamic conditions (e.g. during walking) is a necessary requirement that motor control must reach to avoid falls. However, this is a challenging situation, since to ensure the forward progression of the body, the center of mass must stay outside the base of support in the sagittal plane, and simultaneously remain inside the lateral borders in the frontal plane. Deviation from normative data of healthy subjects in dynamic balance could be used to quantify gait stability, fall risk and to provide hints for rehabilitation. However, normative data can be influenced by age, sex, anthropometry and spatio-temporal gait parameters, and such differences among subjects and leg side can hamper accurate assessment. The aims of this study were to investigate, in a group of healthy subjects: (1) possible asymmetry in dynamic balance maintenance strategies between leg sides, (2) the influence of age, sex and anthropometry on stability and (3) its dependence by spatio-temporal gait parameters. A total of 34 healthy subjects aged between 21 and 71 years, and ranging from 50.1 to 101.6 kg of body mass and from 155.0 to 188.9 cm of height were assessed on spatio-temporal and dynamic balance parameters (Foot Placement Estimator at heel strike and Margin of Stability at mid-stance) during self-selected gait. No parameter showed differences between legs. Dynamic balance parameters were influenced by sex, age, body mass and height mainly in the frontal plane. These measures were also correlated with gait speed and stride length both in the antero-posterior and medio-lateral directions. In addition also cadence and step width influenced the stability in the sagittal and frontal planes, respectively. The findings of this study confirm the symmetry in motor control of dynamic balance during self-selected gait in healthy subjects. Sex, anthropometry and spatio-temporal gait parameters have a significant effect on stability parameters, and this should be taken into account in dynamic balance studies.

show abstract

Section: Dynamic Balance Parameters During Overground Gaitmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Measures of dynamic balance during level walking in healthy adult subjects: Relationship with age, anthropometry and spatio-temporal gait parameters

Lencioni

Carpinella

Rabuffetti

et al. 2019

Proc Inst Mech Eng H

View full text Add to dashboard Cite

show abstract

“…The PD group slowed down significantly going from concrete to turf and did not change their MOS depending on the direction of travel. Though a smaller MOS is generally associated with a greater increase in fall risk, 19 it is also associated with greater confidence during gait. 27 In this study, the HC participants exhibited greater confidence when walking back and forth.…”

Section: Discussionmentioning

confidence: 96%

“…This process was repeated for the right foot. The MOS was defined using factors proposed by Terry et al, 19 which measure the distance between the velocity-adjusted COM and the center of pressure orthogonally to the direction of travel. Equation 1.1shows the MOS calculation.…”

Section: Dependent Variablesmentioning

confidence: 99%

Changes in Step Characteristics Over a Known Outdoor Surface Transition: The Effect of Parkinson Disease

Gomez

Gubler

Foreman

2021

Journal of Applied Biomechanics

View full text Add to dashboard Cite

The factors that contribute to the difficulties persons with Parkinson Disease (PwPD) have when negotiating transitions in walking surfaces are not completely known. The authors investigated if PwPD adjusted their step characteristics when negotiating a familiar outdoor surface transition between synthetic concrete and synthetic turf. Force plate and motion capture data were collected for 10 participants with mild to moderate Parkinson disease and 5 healthy older control participants ambulating bidirectionally across the transition between synthetic concrete and synthetic turf. Between groups, PwPD had a significantly higher minimum toe clearance (P = .007) for both directions of travel compared with the healthy control group. Within groups, PwPD significantly increased their hip (P < .001) and ankle (P = .016) range of motion walking from concrete to turf, while the healthy control participants significantly increased their minimum toe clearance (P = .013), margin of stability (P = .019), hip (P < .001) and ankle (P = .038) range of motion, and step length (P < .001). Walking from turf to concrete, both the Parkinson disease group (P = .014) and the healthy control group (P < .001) increased their knee range of motion. Both groups adjusted their step characteristics when negotiating known surface transitions, indicating that surface transitions result in step changes regardless of health status. However, PwPD exhibited overcompensations, particularly in their minimum toe clearance.

show abstract

Gait stability improves following unilateral total ankle arthroplasty

Barylak,

Arena,

Carpentier

et al. 2024

Journal Orthopaedic Research

View full text Add to dashboard Cite

End‐stage ankle arthritis is often treated surgically by total ankle arthroplasty (TAA) due to its potential to improve gait through increased joint range of motion and reduce pain. However, TAA's effect on gait stability is not well understood. This study explores the impact of TAA on gait stability, measured by Margin of Stability (MoS), in 148 patients with end‐stage ankle arthritis. Kinematic data were collected pre‐operatively, at 1‐year post‐op, and at 2‐years post‐op and the MoS was determined at heel strike and midstance for the anteroposterior (MoSAP) and mediolateral (MoSML) directions. A linear mixed effects model including gait speed as a factor was used to assess the effects of limb, session, and their interaction on outcome measures. A significant interaction (p < 0.002) between limb (surgical, nonsurgical) and session (pre‐op, 1‐year post‐op, 2‐years post‐op) was identified for each MoS variable of interest. Cumulatively, our results suggest that the nonsurgical limb, MoSAP at heel strike and MoSML at midstance improved (increased) as time from surgery increased. These results suggest patients developed a compensatory movement pattern to navigate surgical limb single support. TAA reduces this compensation improving side‐to‐side symmetry, while not fully restoring symmetry by 2‐years post‐op. These results indicate that TAA could improve gait stability in patients with end‐stage ankle arthritis, but further work is needed to understand the impact of TAA on altering fall risk.

show abstract

A New Perspective on the Walking Margin of Stability

Cited by 18 publications

References 13 publications

Measures of dynamic balance during level walking in healthy adult subjects: Relationship with age, anthropometry and spatio-temporal gait parameters

Measures of dynamic balance during level walking in healthy adult subjects: Relationship with age, anthropometry and spatio-temporal gait parameters

Changes in Step Characteristics Over a Known Outdoor Surface Transition: The Effect of Parkinson Disease

Gait stability improves following unilateral total ankle arthroplasty

Contact Info

Product

Resources

About