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
Methods and Materials
Four experienced skiers aged 20 to 58 years were included in this feasibility study which was conducted in Lech,
MRI examinations of both knees including T2*-mapping sequences were acquired of every test person before skiing (baseline),
one hour (follow up 1) and four hours (follow up 2) after skiing and after recovery overnight.
Initially two test subjects used either a conventional ski binding system or ACTRI F respectively.
After recovery time of one week study procedure was repeated using the respective other ski binding system.
Test persons were instructed to choose slopes of similar degree of difficulty. MR-examinations were acquired at scheduled time-slots on a 1.5 whole body MRI-system (Siemens Healthineers; Magnetom Aera) directly situated at the skiing area.
T2*-relaxation time was measured in 60 defined chondral ROIs in both femorotibial und patellofemoral joints on a workstation (Siemens Healthineers Syngo MapIT).
In femorotibial joint quantitative analysis was performed in medial and lateral knee compartment within the weight-bearing segment defined on the basis of the peripheral meniscal margins.
Femoral and tibial cartilage were divided into three zones of equal thirds (anterior,
central and posterior).
Each zone was divided in a superficial and deep layer (Fig.
In the patellofemoral joint most central axial slice through the patellar and trochlear cartilage was divided into three zones of equal thirds (medial,
central and lateral).
Each zone was divided into into a deep and superficial layer (Fig.
Changes of T2*-times in relation to baseline were mathematically analyzed and presented graphically.