Loading Stack -
0 images remaining
Post arthroscopic case of ACL reconstruction shows screw fixation at lateral femoral and medial tibial condyle with no loosening and minimal adjoining bone marrow edema. ACL is of intermediate signal intensity and appears parallel to the blumensaats line.
The patello femoral articulation is incongruent, with lateral patellar instability. Findings evident on axial sections are:
- Thickened medial patellar retinaculum and tibiofemoral ligaments.
- Dysplastic trochlear fossa
- Flattened and asymmetrical medial facet
- Abnormal medial-lateral facet ratio <40% MT/LT
- Mildly reduced troclear depth 2.3mm
The lateral trochlear inclination angle is normal. There is not obvious ventral prominence either. No obvious features of articular cartilage edema/erosion or medial patellofemoral ligament (MPFL)scarring/tear/avulsion are seen.
Hence it was concluded that the give-way sensation was attributable to the transient lateral patellar instability due to coexistent mild degree of femoral trochlear dysplasia and not a post arthroscopic consequence.