Download Detailed descriptions of the parameters measured in coronal

Detailed descriptions of the parameters measured in coronal imaging (T1).
Medial femoral condylar height
The image chosen was the one where the maximum height of the
medial condyle was found. The measurement was made on the
most central part of the condyle. The measuring line was always a
vertical line. The measurements were made on both bone and
cartilage margins separately.
Medial femoral condylar width
The image chosen was the one where the maximum height of the
medial condyle was found. The width was measured from the
point where the angle of the intracondylar fossa first flattens out
below the condylar intersection.
Lateral femoral condylar height
The image chosen was the one where the maximum height of the
lateral condyle was found. The measurement was made on the
most central part of the condyle. The measuring line was always a
vertical line. The measurements were made on both bone and
cartilage margins separately.
Lateral femoral condylar width
The image chosen was the one where the maximum height of the
lateral condyle was found. The width was measured from the point
where the angle of the intracondylar fossa first flattens out below
the condylar intersection.
Anterior tibial spine height
The image chosen was the one where the tibial spine was the
highest. A baseline was drawn along the proximal tibial cartilage
surface. The measurement was made from this line to the peak of
the cartilaginous spine.
MPFL femoral insertion site
relative to the growth plate
To localize the MPFL insertion site, the axial sequence was used
to cross-reference the appropriate coronal image. The axial image
was chosen at the level where this structure was attached to the
femur. At the matching level on the coronal view, a vertical line
was drawn from this site to the center of the physeal plate/scar.
Detailed descriptions of the parameters measured in sagittal imaging (T1).
Insall-Salvati
The image chosen for the measurement was the one where the
patella was the longest. Measures were made by drawing a line
from the most distal point of the patella towards the most proximal
insertion site for the patella tendon of the tibia, and a line drawn
from the most distal part of the most proximal part of the patella.
Caton-Deschamps
The image chosen for the measurement was the one where the
patella was the longest. The measures were made as a line drawn
from the most distal articular surface of the patella to the closest
point on the tibial plateau, and a line drawn along the length of the
patellar articular surface.
Effusion (T2)
Not present: No effusion visible
If present → Grade
Grade 0: Synovial fluid stops below upper margin of quadriceps
fat pad on sagittal.
Grade 1: Fluid above upper margin of fat pad, but less than the
length of the patella.
Grade 2: Fluid above fat pad and greater than patella length.
Grade 3: Fluid above fat pad and seen on serial images.
Detailed descriptions of the parameters measured in axial imaging (T1).
Patella apex angle
The image chosen for the measurement was the one where the
patella was the widest. The angle between the medial and lateral
facets on the patella was measured.
Angle of Fulkerson
The image chosen for the measurement was the one where the
patella was the widest. A line was drawn along the lateral facet of
the patella, and a line drawn across the posterior cartilage margin
of the medial and lateral condyle. The angle between the two lines
was recorded as the patellar angle of Fulkerson. Medial or lateral
opening was stated.
Patellar inclination angle
The image chosen for the measurement was the one where the
patella was the widest. A line was drawn through the transverse
axis of the patella. Then a line was drawn across the posterior
cartilage margin of the lateral and medial condyle. The angle
between these two lines and the transverse line is the patellar
inclination angle. Medial or lateral opening was stated.
Femoral sulcus angle
The image chosen for the measurement was the one in the middle
of the trochlea, where the deepest point of the trochlear groove
was found. The total angle between the medial and the lateral
facets of the femur was measured. Furthermore, the medial and
lateral angle was measured separately in the same slice, using the
deepest points of the posterior groove as standard reference.
Femoral sulcus depth
The image chosen for the measurement was the one in the middle
of the trochlea, where the deepest point of the trochlear groove
was found. A baseline was drawn across the anterior margins of
the lateral and medial condyle. The depth was measured with a
perpendicular line from the baseline to the deepest point of the
trochlear groove.
ETIT – Ratio of lateral (external)
trochlea to medial (internal)
trochlea
The image chosen for the measurement was the one in the middle
of the trochlea, where the deepest point of the trochlear groove
was found. A line was drawn across the lateral patellar facet of the
trochlea. A second line was drawn across the medial patellar facet
of the trochlea. ETIT = the first line divided by the second line.
TTTG – Tibial Tuberosity to
Trochlear Groove
The first image chosen for the measurement was the one where the
trochlear groove was the deepest, this point was a starting point for
the measurement referenced in three dimensions. The second
image chosen for the measurement was the one where the patellar
tendon inserts to the tibial tuberosity. The center of the tubercle
was marked as the second reference point for the measurement. A
reference line was drawn across the posterior margin of the lateral
and medial condyles. The measure between the two points in space
was then made as it was drawn in parallel to the posterior condyle
reference line.
Cartilage thickness of the
trochlear groove
The image chosen for the measurement was the one where the
trochlear groove was the deepest. The cartilage was measured
from the deepest point of the trochlear groove to the upper margin
of the cartilage.
Cartilage thickness of the lateral
condyle
The image chosen for the measurement was the one where the
trochlear groove was the deepest. The thickness of the cartilage
was measured from the most superior point of the lateral condyle
down to where the cartilage ends.