Athletic injuries, Experimental investigations, MR-Functional imaging, Musculoskeletal joint
S. Kleiner1, T. Martensen2, H. Linzmeier3, H.-J. Wilke2, M. Beer2, U. H. W. Schütz2; 1Ulm /DE, 2Ulm/DE, 3Konstanz/DE
All MR-examinations could be acquired at the scheduled time-slots.
The average measurement time for both knees was 25 minutes.
The delay between skiing and the acquisition of the T2* mapping data in follow-up 1 and follow up 2 was predominantly less than 10 minutes.
Differences in T2* time (ms) compared to initial individual baseline (baseline 1),
follow up 1 and 2 (fu 1-1 and fu 1-2),
baseline at the following weekend (baseline 2) and follow up 1 and 2 (fu 2-1 and fu 2-2) for the right and left femorotibial and patellofemoral joint of the four test subjects are graphically displayed in figure 4 - 7.
In all individuals changes of T2*-time in both femorotibial und patellofemoral joints could be detected compared to baseline.
Generally changes of T2*-time in patellofemoral joint were stronger than femorotibial.
This could reflect differences in mechanical stress in the different compartments of the knee during skiing.
No clear trend of T2* changes between baseline and follow up 1 after 1 hour and follow up 2 after 4 hours of skiing in femorotibial and femoropatellar joints could be detected.
Between follow up 2 and recovery over night T2* time increased in both femorotibial joint of all individuals and in three of four individuals in femoropatellar joint.
Between recovery and baseline 2 one week later there was a clear trend of decrease of T2* time in femorotibial and femoropatellar joint.
Increase of T2* signal overnight therefore might reflect changes of water content of the cartilage in response to mechanical stress generated by skiing.
No clear differences in changes of T2* signal between the different ski binding systems were observed.
Due to the small number of test subjects no statistical significances could be achieved.