Keizer, M.N.J. (2017) Control of Anterior Tibia Translation in a Dynamic 2 Situation in Healthy Subjects. thesis, Sport Sciences.
Full text available on request.Abstract
Background: Kvist (2005) reported that there is no correlation between anterior tibia translation (laxity of the knee joint and ATT) in a passive situation and ATT in an active situation. The cause of this difference is not known. The available passive laxity of the knee might be different in an active situation due to the contribution of muscle co-activity. Purpose: The aim of this study was to investigate whether motor control during a jumping task can control the available knee laxity in healthy subjects. Method: 21 participants without knee traumas performed a jumping task, and passive ATT was measured using a KT-1000 arthrometer. The ATT and muscle activity were collected during both tests. During the jumping task, knee exion angle, exion/extension torque, and vertical ground reaction force were collected as well. Results: A negative correlation was found between the maximal posterior tibia translation (PTT) and the activity of the vastus medialis, vastus lateralis, gastrocnemius lateralis and hamstring lateralis at the moment of maximal PTT and nonsignificant correlations were found between the maximal ATT and the muscle activity at the moment of maximal ATT during the jumping task. Besides, a significant negative correlation was found between the passive ATT and the maximal ATT during the jump, and a significant positive correlation was found between the passive ATT and the maximal PTT during the jump. A negative correlation was found between the maximal ATT and the maximal PTT during the jumping task. Conclusion: Co-activation of the lateral hamstring and vastus lateralis and medialis generate an ATT during the jumping task. Before to off as well as after initial ground contact co-activation of the hamstrings and quadriceps was seen. However, no relation was found between muscle activity and the passive ATT. It appears that participants who have high laxity during the passive test have their tibia more posterior during the jumping task. A knee joint with great passive laxity most likely shows little laxity in a jumping task due to neuromuscular control. Keywords: knee, knee laxity, muscle activity
| Item Type: | Thesis (UNSPECIFIED) |
|---|---|
| Supervisor name: | Hijmans, J. and Gokeler, A. and Benjaminse, A. and Otten, E. |
| Faculty: | Medical Sciences |
| Date Deposited: | 06 May 2022 12:14 |
| Last Modified: | 06 May 2022 12:21 |
| URI: | https://umcg.studenttheses.ub.rug.nl/id/eprint/3241 |
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