Knee Flashcards
Why is normal 10 deg Valgus at the knee present?
- Medial Femoral Condyle Extends longer distally than does the Lateral Femoral Condyle
Why does the Lateral Femoral Condyle Extend Longer Anteriorly than the Medial Femoral Condyle?
- Prevent Lateral Translation of the Patella
What structures are the Lateral and Medial Meniscus attached to in order to allow for Posterior Translation during knee flexion?
- Lateral- Popliteus
- Medial- Semimembranosus
In what knee position are the MCL and LCL Taut?
- Extension
In what knee position are the bundles of the ACL Taut?
- Post-Lat Bundle- Extension
- Ant-Med Bundle- Flexion
What are the important stabilizing structures of the Posterolateral Corner?
- Lateral Collateral Ligament
- Popliteus Tendon
- Popliteofibular Ligament
Describe Hughstons Tests for knee Ligamentous Laxity
- Similar to Post Drawer, but with Tibia in ER or IR approx 15 deg
- ER tests Posterolateral Corner
- IR tests Posteromedial instability
Describe Slocums Tests for Knee Ligamentous Laxity
Similar to Ant Drawer, but with Tibia in IR or ER approx 15 deg
- IR tests Anterolateral Instability
- ER tests Anteromedial Instability
What are common Tests used to diagnose Posterolateral Corner Injury?
- Dial Test
- Hughstons Test (Posterolateral Drawer)
- Varus Stress Test
- External Rotation Recurvatum Test
Disruption of the Infrapatellar Bursa may cause what type of patellofemoral abnormality?
- Patella Baja
What is a lateral blowout sign of the knee?
- Swelling over the Lateral Joint Line following an injury
- Occurs because the capsule is very thin on the lateral side of the knee
What is the role of the Posterior Oblique Ligament of the knee?
- Primary Ligamentous Structure on the Posterior Medial side of the knee
- Controls Anterior Medial Rotary Instability
- Provides static resistance against Valgus when the knee moves into full extension
What is the role of the arcuate complex?
- Comprised of the LCL, Arcuate Ligament, and popliteus
- Controls Internal Rotation of the Femur on the Tibia during closed chain activity
What bony factors can result in lateral tracking of the patella?
- Dysplastic Patella
- Patella Alta
- Shallow Intercondylar Groove
What Soft tissue factors can result in lateral tracking of the patella?
- Tight Lateral Retinaculum
- Tight IT Band
What is Patella Alta?
- Cephalad position of the Patella
What is Lateral Pressure Syndrome?
- Caused by tight lateral retinaculum tightness ,pulling the patella laterally
What is the difference between Osgood Schlatters and Sinding Larsen Johannson?
- Both are Apophysitis
- Osgood Schlatter is of the Tibial Tubercle
- Synding Larsen Johannson is of the distal pole of the patella