Thursday, February 25, 2010
Deep Lateral Sulcus Sign (Deep Femoral Notch Sign) and ACL Tear
Strictly a plain film sign, the deep lateral femoral notch (sulcus) sign is a secondary sign of an ACL tear (rotational and valgus force).
The Lateral Femoral Notch Sign -- June 2001 Radiology, 219, 800-801.
Tuesday, February 23, 2010
Subcoracoid Impingement and Subscapularis Tear
Normal coracohumeral distance is betweeen 8.4-11mm. In this case it was about 3mm.
Saturday, February 20, 2010
Thursday, February 18, 2010
Lateral Patella Subluxation, Patella Tilt, Shallow Trochlea Groove and Borderline Patella Alta
MRI criteria for patella alta and baja
Patellar length (PL) and patellar tendon length (TL) were measured .....on sagittal images by a line connecting the superior and inferior patellar poles and the shortest length of the inner margin of the tendon respectively. TL/PL ratio was subsequently calculated
Ratios defined for patella alta and baja were 1.52 and 0.79 respectively in females and 1.32 and 0.74 respectively in males
Skeletal Radiol. 2004 Aug;33(8):445-50. Epub 2004 Jun 24.
http://www.ncbi.nlm.nih.gov/pubmed/15221214
Factors predisposing to Patella Instability:
1. Trochlea dysplasia
2. Patella alta (TL/PL > 1.3 abnormal)
3. Lateralisation of tibial tuberosity
MR Imaging of Patellar Instability: Injury Patterns and Assessment of Risk Factors
http://radiographics.rsna.org/content/30/4/961.full
Factors predisposing to Patella Instability:
1. Trochlea dysplasia
2. Patella alta (TL/PL > 1.3 abnormal)
3. Lateralisation of tibial tuberosity
MR Imaging of Patellar Instability: Injury Patterns and Assessment of Risk Factors
http://radiographics.rsna.org/content/30/4/961.full
