Effects of Lidocaine into Knee on QF Strength and EMG in Patients with ACL Lesion

Yu Konishi, Yuji Suzuki, Norikazu Hirose, Toru Fukubayashi

研究成果: Article

12 引用 (Scopus)

抄録

Purpose: In our previous study, we found that injection of lidocaine into intact knees reduced the maximal voluntary contraction (MVC) and integrated electromyogram (I-EMG) of the quadriceps femoris (QF). This study was designed to investigate changes in the MVC and I-EMG of the QF in response to lidocaine, in patients with anterior cruciate ligament (ACL) lesion, to evaluate α-motoneuron activity innervating the QF. Methods: The MVC of knee extension and I-EMG of the vastus medialis (VM), vastus lateralis (VL), and rectus femoris (RF) muscles were measured in eight patients with ruptured ACL, before and after lidocaine injection into the knee. Results: There were no significant differences between preinjection and postinjection values of MVC (preinjection: 167 ± 49 N·m; postinjection: 164 ± 55 N·m) and I-EMG (preinjection: VL: 0.11 ± 0.06, VM: 0.13 ± 0.10, RF: 0.09 ± 0.04) (postinjection: VL: 0.12 ± 0.07, VM: 0.13 ± 0.10, RF: 0.09 ± 0.05). Conclusion: Our results indicated that hindrance of afferent feedback from the knee in patients with ACL rupture did not significantly change α-motoneuron activity. Lidocaine injection into the knee joint of the subjects in this study only attenuated afferent feedback from mechanoreceptors in the knee joint cavity, but not in the ACL, as afferent feedback from ACL was already lost due to ACL rupture. This indicated that attenuation of afferent feedback from mechanoreceptors in the knee joint cavity other than the ACL did not significantly decrease the activity of α-motoneurons innervating the QF during MVC exertion. Therefore, our findings provide evidence that afferent feedback from the ACL has a major influence on the MVC exertion of the QF.

元の言語English
ページ(範囲)1805-1808
ページ数4
ジャーナルMedicine and Science in Sports and Exercise
35
発行部数11
DOI
出版物ステータスPublished - 2003 11
外部発表Yes

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Anterior Cruciate Ligament
Quadriceps Muscle
Lidocaine
Knee
Electromyography
Motor Neurons
Knee Joint
Mechanoreceptors
Injections
Rupture

ASJC Scopus subject areas

  • Public Health, Environmental and Occupational Health
  • Physical Therapy, Sports Therapy and Rehabilitation
  • Orthopedics and Sports Medicine

これを引用

Effects of Lidocaine into Knee on QF Strength and EMG in Patients with ACL Lesion. / Konishi, Yu; Suzuki, Yuji; Hirose, Norikazu; Fukubayashi, Toru.

:: Medicine and Science in Sports and Exercise, 巻 35, 番号 11, 11.2003, p. 1805-1808.

研究成果: Article

Konishi, Yu ; Suzuki, Yuji ; Hirose, Norikazu ; Fukubayashi, Toru. / Effects of Lidocaine into Knee on QF Strength and EMG in Patients with ACL Lesion. :: Medicine and Science in Sports and Exercise. 2003 ; 巻 35, 番号 11. pp. 1805-1808.
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abstract = "Purpose: In our previous study, we found that injection of lidocaine into intact knees reduced the maximal voluntary contraction (MVC) and integrated electromyogram (I-EMG) of the quadriceps femoris (QF). This study was designed to investigate changes in the MVC and I-EMG of the QF in response to lidocaine, in patients with anterior cruciate ligament (ACL) lesion, to evaluate α-motoneuron activity innervating the QF. Methods: The MVC of knee extension and I-EMG of the vastus medialis (VM), vastus lateralis (VL), and rectus femoris (RF) muscles were measured in eight patients with ruptured ACL, before and after lidocaine injection into the knee. Results: There were no significant differences between preinjection and postinjection values of MVC (preinjection: 167 ± 49 N·m; postinjection: 164 ± 55 N·m) and I-EMG (preinjection: VL: 0.11 ± 0.06, VM: 0.13 ± 0.10, RF: 0.09 ± 0.04) (postinjection: VL: 0.12 ± 0.07, VM: 0.13 ± 0.10, RF: 0.09 ± 0.05). Conclusion: Our results indicated that hindrance of afferent feedback from the knee in patients with ACL rupture did not significantly change α-motoneuron activity. Lidocaine injection into the knee joint of the subjects in this study only attenuated afferent feedback from mechanoreceptors in the knee joint cavity, but not in the ACL, as afferent feedback from ACL was already lost due to ACL rupture. This indicated that attenuation of afferent feedback from mechanoreceptors in the knee joint cavity other than the ACL did not significantly decrease the activity of α-motoneurons innervating the QF during MVC exertion. Therefore, our findings provide evidence that afferent feedback from the ACL has a major influence on the MVC exertion of the QF.",
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N2 - Purpose: In our previous study, we found that injection of lidocaine into intact knees reduced the maximal voluntary contraction (MVC) and integrated electromyogram (I-EMG) of the quadriceps femoris (QF). This study was designed to investigate changes in the MVC and I-EMG of the QF in response to lidocaine, in patients with anterior cruciate ligament (ACL) lesion, to evaluate α-motoneuron activity innervating the QF. Methods: The MVC of knee extension and I-EMG of the vastus medialis (VM), vastus lateralis (VL), and rectus femoris (RF) muscles were measured in eight patients with ruptured ACL, before and after lidocaine injection into the knee. Results: There were no significant differences between preinjection and postinjection values of MVC (preinjection: 167 ± 49 N·m; postinjection: 164 ± 55 N·m) and I-EMG (preinjection: VL: 0.11 ± 0.06, VM: 0.13 ± 0.10, RF: 0.09 ± 0.04) (postinjection: VL: 0.12 ± 0.07, VM: 0.13 ± 0.10, RF: 0.09 ± 0.05). Conclusion: Our results indicated that hindrance of afferent feedback from the knee in patients with ACL rupture did not significantly change α-motoneuron activity. Lidocaine injection into the knee joint of the subjects in this study only attenuated afferent feedback from mechanoreceptors in the knee joint cavity, but not in the ACL, as afferent feedback from ACL was already lost due to ACL rupture. This indicated that attenuation of afferent feedback from mechanoreceptors in the knee joint cavity other than the ACL did not significantly decrease the activity of α-motoneurons innervating the QF during MVC exertion. Therefore, our findings provide evidence that afferent feedback from the ACL has a major influence on the MVC exertion of the QF.

AB - Purpose: In our previous study, we found that injection of lidocaine into intact knees reduced the maximal voluntary contraction (MVC) and integrated electromyogram (I-EMG) of the quadriceps femoris (QF). This study was designed to investigate changes in the MVC and I-EMG of the QF in response to lidocaine, in patients with anterior cruciate ligament (ACL) lesion, to evaluate α-motoneuron activity innervating the QF. Methods: The MVC of knee extension and I-EMG of the vastus medialis (VM), vastus lateralis (VL), and rectus femoris (RF) muscles were measured in eight patients with ruptured ACL, before and after lidocaine injection into the knee. Results: There were no significant differences between preinjection and postinjection values of MVC (preinjection: 167 ± 49 N·m; postinjection: 164 ± 55 N·m) and I-EMG (preinjection: VL: 0.11 ± 0.06, VM: 0.13 ± 0.10, RF: 0.09 ± 0.04) (postinjection: VL: 0.12 ± 0.07, VM: 0.13 ± 0.10, RF: 0.09 ± 0.05). Conclusion: Our results indicated that hindrance of afferent feedback from the knee in patients with ACL rupture did not significantly change α-motoneuron activity. Lidocaine injection into the knee joint of the subjects in this study only attenuated afferent feedback from mechanoreceptors in the knee joint cavity, but not in the ACL, as afferent feedback from ACL was already lost due to ACL rupture. This indicated that attenuation of afferent feedback from mechanoreceptors in the knee joint cavity other than the ACL did not significantly decrease the activity of α-motoneurons innervating the QF during MVC exertion. Therefore, our findings provide evidence that afferent feedback from the ACL has a major influence on the MVC exertion of the QF.

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KW - Reflex inhibition

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