Central somatosensory changes and altered muscle synergies in subjects with anterior cruciate ligament deficiency

Courtney, Carol A.; Rine, Rose Marie; Kroll, Penny G.

doi:10.1016/j.gaitpost.2004.07.002

Cited by 86 publications

(84 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…For instance it has been shown, using both animal and human subjects, that activation of the ACL mechanoreceptors induces hamstring contraction resisting anterior tibial translation (ACL-hamstring reflex) [15,18,47]. It has been proposed that the loss of proprioceptive input from the mechanoreceptors that exist in the ACL may lead to changes in the central nervous system which in turn, leads to the development of altered muscle patterns and postural synergies [10,13,49]. For instance, Courtney et al showed that ACL deficient patients exhibit altered somatosensory evoked potentials and also different gastrocnemius and hamstrings activity during treadmill walking [10].…”

Section: Discussionmentioning

confidence: 99%

ACL deficiency affects stride-to-stride variability as measured using nonlinear methodology

Moraiti

Stergiou

Ristanis

et al. 2007

Knee Surg Sports Traumatol Arthr

View full text Add to dashboard Cite

Previous studies suggested that the small fluctuations present in movement patterns from one stride to the next during walking can be useful in the investigation of various pathological conditions. Previous studies using nonlinear measures have resulted in the development of the "loss of complexity hypothesis" which states that disease can affect the variability and decrease the complexity of a system, rendering it less able to adjust to the ever changing environmental demands. The nonlinear measure of the Lyapunov Exponent (LyE) has already been used for the assessment of stride-to-stride variability in the anterior cruciate ligament (ACL) deficient knee in comparison to the contralateral intact knee. However, there is biomechanical evidence that after ACL rupture, adaptations are also present in the contralateral intact knee. Thus, our goal was to investigate stride-to-stride variability in the ACL deficient knee as compared to a healthy control knee. Seven subjects with unilateral ACL deficiency and seven healthy controls walked at their self-selected speed on a treadmill, while three-dimensional knee kinematics was collected for 80 consecutive strides. A nonlinear measure, the largest LyE was calculated from the resulted knee joint flexion-extension data of both groups. Larger LyE values signify increased variability and increased sensitivity to initial conditions. Our results showed that the ACL deficient group exhibited significantly less variable walking patterns than the healthy control. These changes are not desirable because they reflect decreases in system's complexity, which indicates narrowed functional responsiveness, according to the "loss of complexity hypothesis." This may be related with the increased future pathology found in ACL deficient patients. The methods used in the present paper showed great promise to assess the gait handicap in knee injured patients.

show abstract

Section: Discussionmentioning

confidence: 99%

ACL deficiency affects stride-to-stride variability as measured using nonlinear methodology

Moraiti

Stergiou

Ristanis

et al. 2007

Knee Surg Sports Traumatol Arthr

View full text Add to dashboard Cite

show abstract

“…Our primary finding was that after ACLR, patients did not have deficits in postural stability compared to the control group. Decreased joint proprioception has been shown by several authors 4,5,16,25,26) . On the other hand, some researchers have reported that impaired postural control of ACL deficient patients significantly improved following reconstruction 2,17,19) while o t h e r s h a v e f a i l e d t o f i n d a s i g n i f i c a n t difference 5,12,[27][28][29] .…”

Section: Discussionmentioning

confidence: 83%

Effect of Proprioceptive Rehabilitation on Postural Control Following Anterior Cruciate Ligament Reconstruction

2010

View full text Add to dashboard Cite

Abstract.[Purpose] The aim of this study was to determine the functional level of activity and postural control after rehabilitation of anterior cruciate ligament reconstructed knees and compare them with nonoperated limbs and healthy limbs in control subjects.[Subjects] Twenty-seven patients participated in the study: 17 had undergone reconstruction with a bone-patellar tendon-bone and 10 with a semitendinosus graft technique. The same rehabilitation protocol was used for all of the patients. Besides the patients, 18 healthy volunteers participated as a control group. [Results] There were no significant differences for the eyes open static stabilometry test between operated and non-operated limbs of the patients. On the other hand, there were statistically significant differences for the closed eyes static balance test between the operated and non-operated limbs at 3 and 6 months after surgery. There were significant differences for the eyes open static balance test between the 3rd and 6th, and 6th and 12th months and for the eyes closed test of non-operated limbs between the same months as well. No statistically significant differences were noted in the dynamic balance tests between the patients and the control group. Lysholm scores of the patients obtained at 6 and 12th months after surgery were significantly better than those at 3 months after surgery. Different operation techniques revealed no significant differences in any test performed at any time.[Conclusions] Performing a postoperative sportive rehabilitation including specific proprioceptive training sessions has positive effects both on clinical status and postural control of the patients.

show abstract

“…Although the sample size of the coper group is equivalent to many previous studies, [5,12,14,37] a larger sample of this group would decrease the chance of biased proportions [16]. In addition, muscle activation patterns associated with ACL deficiency may also be influenced by training, motor control, proprioceptive and strength deficits [40][41][42]. This study is unable to weight the influence of these various factors.…”

Section: Limitationsmentioning

confidence: 85%

Analysis of EMG patterns of control subjects and subjects with ACL deficiency during an unanticipated walking cut task

et al. 2007

View full text Add to dashboard Cite

Central somatosensory changes and altered muscle synergies in subjects with anterior cruciate ligament deficiency

Cited by 86 publications

References 20 publications

ACL deficiency affects stride-to-stride variability as measured using nonlinear methodology

ACL deficiency affects stride-to-stride variability as measured using nonlinear methodology

Effect of Proprioceptive Rehabilitation on Postural Control Following Anterior Cruciate Ligament Reconstruction

Analysis of EMG patterns of control subjects and subjects with ACL deficiency during an unanticipated walking cut task

Contact Info

Product

Resources

About