CT LEFT KNEE (patellar tracking and dislocation protocol)



CT LEFT KNEE (patellar tracking and dislocation protocol)

Technique:

Non-contrast CT imaging through the knees with rotational measurements.

FINDINGS:

Mechanical axis:

Genu valgus/varus:

TL:PL: 0.9 (normal 1.2)

Congruence angle: (average '-' 6 degrees i.e. medial 6 degrees)

Lateral patellofemoral angle : (if opens medially indicates patella tilt)

Femoro-tibial rotation:

Tibial torsion: (greater than 40 associated with maltracking)

Femoral torsion: (average anteversion 15-24 degrees with range of 3-48 degrees)

T-TT distance: (15-19mm considered borderline, 20 mm or greater associated with instability)

Sulcus angle: (normal 138 degrees plus or minus 6)

Lateral trochlear inclination: (if less than 11 degrees indicates trochlea dysplasia)

Trochlear facet ratio: (should be at least 40% of lateral)

Trochlear depth: (3mm or less indicates trochlear dysplasia)

Patellar shape:

Nipple sign of trochlea dysplasia:

Other (OCD, retinaculum):

Conclusion:

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