The Knee & Popliteal Fossa Flashcards
Patella
- Located at the front of the knee joint
- Knee cap
- sesamoid bone
Medial facet
Articulates with the medial condyle of the femur
Lateral facet
Articulates with the lateral condyle of the femur
Functions of the patella
Leg extension and protection
Patellar Dislocation
- displacement of the patella out of the patellofemoral groove
- laterally
- high force impact
- sudden twist of the knee
- football, rugby and ice hockey
Patellar Fracture
- direct trauma
- sudden contraction of the quadriceps muscles
Which of the following attaches to the base of the patella?
Quadriceps tendon
Which of the following attaches to the apex of the patella?
Patellar Ligament
In what direction is the patella most likely to dislocate?
Laterally
What type of joint is the knee joint ?
synovial type
Tibiofemoral
The medial and lateral condyles of the femur articulating with the tibia.
Patellofemoral
The anterior and distal part of the femur articulating with the patella.
what is the weight bearing joint of the knee?
tibifemoral
Blood supply to the knee
Genicular anastomoses around the knee
Medial Meniscus
- fixed to the tibial collateral ligament
- damage to the TCL results in tearing
Lateral and medial Meniscus
- fibrocartilage structures
- deepens the articular surface of the tibia
- acts as shock absorbers
- c-shaped
Suprapatella bursa
Prepatella bursa – Found between the apex of the patella and the skin.
– This is an extension of the synovial cavity of the knee, located between the quadriceps femoris and the femur.
Prepatella bursa
– Found between the apex of the patella and the skin
Infrapatella bursa
– Split into deep and superficial. The deep bursa lies between the tibia and the patella ligament. The superficial lies between the patella ligament and the skin.
Semimembranosus bursa
– Located posteriorly in the knee joint, between the semimembranosus muscle and the medial head of the gastrocnemius.
Patellar ligament
Continuation of the quadriceps femoris tendon distal to the patella.
Tibial Collateral Ligament
- found on the medial side of the joint
- attaches to the medial epicondyle of the femur
- attaches distally to the medial surface of the tibia
Fibular Collateral Ligament
- Thinner and rounder
- lateral
Anterior Cruciate Ligament
Attaches at the anterior intercondylar region of the tibia and ascends posteriorly to attach to the femur, in the intercondylar fossa.
- It prevents anterior dislocation of the tibia onto the femur.
Posterior Cruciate ligament
- Attaches at the posterior intercondylar region of the tibia, and ascends anteriorly to attach to the femur in the intercondylar fossa.
- It prevents posterior dislocation of the tibia onto the femur.
Extensors of the knee joint
Quadriceps femoris
Flexors of the knee
Hamstrings, gracilis,Sartorious,popliteus
Lateral rotators
biceps femoris
medial rotators
semimembranousus , semitendinousus , gracilis , sartorius and popliteus
ACL Tear
- hyperextension
- anterior drawer test
- tibia displaced anteriorly
PCL Damage
- dash board injury
- knee is flexed
- tibia pushed posteriorly
- posterior draw test
Housemaid’s knee
-prepatellar bursa
Clergyman’s knee
infrapatella bursa
Unhappy triad
- attachment of the medial collateral ligament to the medial meniscus
- lateral force to extended knee
- rugby tackle
- ACL aslo damaged
Which of the following is the correct classification of the knee joint?
Hinge type synovial
The tendon of which muscle group attaches to the patella?
Quadriceps femoris
Which type of cartilage are the menisci comprised of?
Fibrocartilage
Which of the following correctly describe the attachments of the anterior cruciate?
Anterior tibia to posterior femur
Force applied to the lateral aspect of a fixed knee will most likely damage which ligament?
Medial Collateral
Which movement is the cause of posterior cruciate ligament rupture?
Movement of the tibia posteriorly on femur
Popliteal fossa
- Diamond shaped
- posterior knee
Superomedial border
semimembranousus
Superorlateral border
biceps femoris
Inferomedial border
medial head of the gastrocnemius
Inferolateral border
lateral head of the gastrocnemius and plantaris
Floor of the popliteal fossa
The posterior surface of the knee joint capsule, and by the posterior surface of the femur.
Roof of the popliteal
popliteal fascia and skin
Contents (medial to lateral)
popliteal artery , popliteal vein ,tibial nerve , common fibular nerve
Most superficial contents of the popliteal fossa
tibial and common fibular nerves
Along the tendon of which muscle does the common fibular nerve run?
Biceps femoris
Which of the following is the deepest structure in the popliteal fossa?
Popliteal Artery
Which of the following structures become inflamed to form a bakers cyst?
Semimembranousus bursa
Which of the following nerves is most likely to become compressed by a popliteal aneurysm?
Tibial
What superficial vein drains into the popliteal vein within the popliteal fossa?
small saphenous vein
An expansive, pulsating mass is likely to be due to which condition?
Popliteal aneurysm
Damage to the tibial nerve in the popliteal fossa will cause what condition?
Weakened plantar flexion