Brekke AF1,2, Nielsen DB2, Holsgaard-Larsen A2
1School of physiotherapy, University College Zealand, Denmark
2Orthopaedic Research Unit, Department of Orthopaedics and Traumatology, Odense University Hospital, Institute of Clinical Research, University of Southern Denmark
Altered loading pattern of the medial aspect of the knee has been associated with the development of knee osteoarthritis (OA). Anterior cruciate ligament (ACL) injuries are associated with early-onset OA with associated pain, functional limitations, and decreased quality of life. However, specific knee loading pattern of the medial aspect has not been investigated during different jump-tasks in ACL-reconstructed patients.
The purpose was to investigate potential kinetic differences between the ACL-reconstructed and contralateral knee during bilateral and unilateral vertical counter movement jumping, and to investigate potential associations between self-reported knee function and kinetics.
Material and method:
23 ACL-reconstructed men 27.2±7.5 years, all hamstring autografts, 27±7 months post-surgery. Bilateral and unilateral counter movement jumps (CMJ) was measured by a 6 camera Vicon-MX03 system and two AMTI OR6-7 force-plates. Three kinetic outcomes related to the medial aspect of the knee were calculated: Peak knee adduction moment (P-KAM), KAM impulse (I-KAM) and the Total reaction moment (TRM) of the knee calculated by root mean square of the sagittal, frontal and transverse knee joint moments. All participants completed the Knee injury and Osteoarthritis Outcome Score (KOOS) questionnaire.
Significant difference between the reconstructed and contralateral knee in CMJ was found in: TRM-bilateral (10.8%, p<0.05), TRM-unilateral (8.7%, p<0.05), P-KAM-bilateral (26.9%, p<0.05) and P-KAM-unilateral (17.1%, p<0.05). A weak, yet significant association was only found between I-KAM bilateral and KOOS-symptoms (r2=0.18, p<0.05).
Decreased medial load on ACL reconstructed knees was observed during unilateral and bilateral CMJ. A weak association between kinetic outcomes and KOOS indicates poor functional/clinical relevance.
|Bidragets oversatte titel||Sammenhæng mellem kinetiske mål for belastning af knæet ved lodrette counter movement hop og selvrapporteret funktion hos ACL rekonstruerede patienter.|
|Status||Udgivet - 2014|