Elucidation of a potentially destabilizing control strategy in ACL deficient non-copers

Chmielewski, Terese L.; Hurd, Wendy J.; Snyder‐Mackler, Lynn

doi:10.1016/j.jelekin.2004.07.003

Cited by 59 publications

(51 citation statements)

References 25 publications

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“…6,[32][33][34][35] These studies suggest a common abnormal movement pattern of the noncopers during anticipated tasks.…”

Section: T Methods and Measuresmentioning

confidence: 99%

Section: T Methods and Measuresmentioning

confidence: 99%

“…6 Studies of unanticipated tasks suggest that the abnormal movement patterns of the noncopers in response to force platform movement are in the intermediate reflex interval (60-129 milliseconds). 6,7 This suggests that noncopers are able to employ their abnormal movement patterns using feedback control when task demands are longer than this interval. 6,7 Although moving force platforms have validity for reproducing slip events, a criticism of this paradigm is that it lacks validity for simulating sports-related movements that do not involve slipping.…”

Section: T Methods and Measuresmentioning

confidence: 99%

“…6,7 This suggests that noncopers are able to employ their abnormal movement patterns using feedback control when task demands are longer than this interval. 6,7 Although moving force platforms have validity for reproducing slip events, a criticism of this paradigm is that it lacks validity for simulating sports-related movements that do not involve slipping. 47 Unanticipated tasks have validity for simulating sports-related movements while inducing loads in the lower extremity that may challenge subjects that have an ACLD.…”

Section: T Methods and Measuresmentioning

confidence: 99%

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Influence of Anticipation on Movement Patterns in Subjects With ACL Deficiency Classified as Noncopers

Houck

Haven²,

Maloney³

2007

J Orthop Sports Phys Ther

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t MetHoDS anD MeaSuReS: The study included 16 subjects who are ACL deficient, classified as noncopers, and 20 healthy controls. Data were collected using an Optotrak Motion Analysis System and force plate integrated with Motion Monitor Software to generate knee joint angles, moments, and power. Each testing session included anticipated tasks, straight walking task (ST), and 45° side-step cutting tasks (SSC), followed by a set of unexpected straight walking (STU) and unexpected sidestep cutting (SSCU) tasks in a random order. For all tasks speed was maintained at 2 m/s. Peak knee angle, moment, and power variables during early stance were compared using 2-way mixed-effects ANOVA models.t ReSultS: For both the straight and sidestep tasks, the noncoper group did not show a dependence on whether the task was anticipated or unanticipated (group-by-condition interaction) for the knee angle (straight, P = .067; side-step cutting, P = .103), moment (straight, P = .079; side-step cutting, P = .996), and powers (straight, P = .181; side-step cutting, P = .183) during the loading response phase. However, during both straight and side-step cutting tasks, the subjects in the noncoper group used significantly lower knee flexion angles (straight, P = .002; side-step cutting, P = .019), knee moments (straight, P = .005; sidestep cutting, P,.001), and knee powers (straight, P = .013; side-step cutting, P,.001).t concluSionS: This study suggests subjects that are ACL deficient and classified as noncopers use a common abnormal movement pattern of lower knee extensor loading even during unanticipated tasks.

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“…6,[32][33][34][35] These studies suggest a common abnormal movement pattern of the noncopers during anticipated tasks.…”

Section: T Methods and Measuresmentioning

confidence: 99%

Section: T Methods and Measuresmentioning

confidence: 99%

Section: T Methods and Measuresmentioning

confidence: 99%

Section: T Methods and Measuresmentioning

confidence: 99%

See 2 more Smart Citations

Influence of Anticipation on Movement Patterns in Subjects With ACL Deficiency Classified as Noncopers

Houck

Haven²,

Maloney³

2007

J Orthop Sports Phys Ther

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show abstract

“…Subjects who received perturbation training were trained to focus on the somatosensory input from the weight distribution of the foot contact on the board and the afferent information coming from the lower extremity to enhance joint proprioception and muscle response. Hartigan et al [112] investigated patients who have poor dynamic knee stability (defined as ACL noncopers) [113] who had 10 sessions of perturbation training versus strength training over a period of 3-4 weeks. The perturbation group had showed better symmetrical quadriceps strength (97% of the injured leg) and gait (P = 0.14).…”

Section: Proprioception and Neuromuscularmentioning

confidence: 99%

Prehabilitation: The Void in the Management of Anterior Cruciate Ligament Injuries—A Clinical Review

Shaarani

Moyna

Moran

et al. 2012

ISRN Rehabilitation

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The rehabilitation of patients undergoing anterior cruciate ligament (ACL) reconstruction requires symmetry in bilateral quadriceps strength and adequate proprioception capabilities prior to return to preoperative level of activity or sport. This is the limiting factor and can delay the time that patients can return to play. There is little literature on pre-operative physiotherapy or prehabilitation of patient with ACL injury. This paper discusses the anatomy, biomechanics, surgical decision making, and the current knowledge of preoperative training or "prehabilitation" in patients awaiting ACL reconstruction.

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Influences on knee movement strategies during walking in persons with medial knee osteoarthritis

Schmitt¹,

Rudolph²

2007

Arthritis & Rheumatism

133

121

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Objective. To investigate the movement and muscle activation strategies during walking of individuals with medial knee osteoarthritis (OA) to determine the influence of quadriceps strength, medial knee laxity, limb alignment, and selfreported knee instability on knee motion. Methods. Twenty-eight persons with medial knee OA and 26 control subjects participated. Quadriceps strength, medial knee laxity, and limb alignment were measured. Knee instability (I KOS score) was assessed with the Activities of Daily Living Scale of the Knee Outcome Survey. Knee motion and muscle activation patterns were measured with motion analysis. Group differences were detected with independent samples t-tests and predictive relationships were determined with linear and hierarchical regression analyses. Results. Individuals with OA were weaker, had greater medial knee laxity, and had more varus alignment. The OA group used less knee motion and higher muscle co-contraction during weight acceptance and single-limb support. Quadriceps strength and I KOS score significantly strengthened the prediction of knee motion during weight acceptance and single-limb support, whereas limb alignment and medial laxity did not. Conclusion. The knee stiffening and higher muscle co-contraction used by the OA group may be detrimental to joint integrity. I KOS scores predicted knee motion after accounting for quadriceps strength, underscoring the importance of addressing knee instability with appropriate rehabilitation strategies in persons with medial knee OA in order to promote long-term joint integrity.

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Elucidation of a potentially destabilizing control strategy in ACL deficient non-copers

Cited by 59 publications

References 25 publications

Influence of Anticipation on Movement Patterns in Subjects With ACL Deficiency Classified as Noncopers

Influence of Anticipation on Movement Patterns in Subjects With ACL Deficiency Classified as Noncopers

Prehabilitation: The Void in the Management of Anterior Cruciate Ligament Injuries—A Clinical Review

Influences on knee movement strategies during walking in persons with medial knee osteoarthritis

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