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📌 Tibial Tubercle Lateralization
- Tibial tubercle lateralization is a factor in patellar maltracking. It is measured using TT-TG (Tibial Tubercle to Trochlear Groove) and TT-PCL (Tibial Tubercle to Posterior Cruciate Ligament).
1️⃣ TT-TG:
- Definition: Distance between the tibial tubercle and the trochlear groove.
- Normal vs. Abnormal: >20 mm is abnormal.
- Factors: Knee flexion and alignment influence the measurement. Slight knee flexion can reduce it by 1-2 mm.
2️⃣ TT-PCL:
- Definition: Distance between the tibial tubercle and the posterior cruciate ligament.
- Normal vs. Abnormal: >21-24 mm is abnormal.
- Consideration: This may not always reflect true lateralization due to femoral rotation and knee flexion.
3️⃣ Transverse Offset:
- Definition: Assesses tibial tubercle position relative to the lateral trochlear ridge on axial MR images.
- Evaluation: Determines if the tibial tubercle is medial (normal, on track) or lateral (abnormal, off track) to the ridge.
- Relevance: Important for recurrent patellar instability assessment.
✅ Clinical Implications:
- Accurate measurement is essential for diagnosing and treating patellofemoral instability.
- TT-TG is more commonly used and provides critical information for surgical decisions.
➡️ References:
Radiographics. 2023 Jun;43(6):e220177
Skeletal Radiology (2019) 48:859–869
"Visualizing MSK Radiology: A Practical Guide to Radiology Mastery"
© 2022 MSK MRI Jee Eun Lee All Rights Reserved.
No unauthorized reproduction, redistribution, or use for AI training.
#TibialTubercleLateralization, #PatellarMaltracking, #TTTG, #TTPCL, #PatellofemoralInstability, #KneeSurgery, #OrthopedicRadiology,
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