Knee Joint, Anterior and Lateral Leg Flashcards
What kind of joint is the knee joint?
Synovial, hinge joint
How many articulations does the knee have and what are they?
3 articulations = 2 between femur and tibia, 1 between femur and patella
Does the fibula take part in the knee joint?
No
What are the main movements of the knee?
Flexion = mainly hamstrings and gastrocnemius, and tibial and common fibular nerve Extension = mainly quadriceps and femoral nerve
When can there be medial and lateral rotation of the knee?
When the knee joint is flexed to 90 degrees
What carries out medial rotation of the knee?
Hamstrings and gracilis, tibial and obturator nerves
What carries out lateral rotation of the knee?
Biceps femoris , tibial and common fibular nerves
Where is the fibrous capsule of the knee?
Attaches round the margins of the articular cartilage and encloses the synovial cavity
What strengthens the fibrous capsule?
Ligaments
What are the ligaments which stabilise the knee joint?
Iliotibial tract, tibial (medial) and fibular (lateral) collateral ligaments, anterior and posterior cruciate ligaments
What are the menisci?
Crescentic discs (medial and lateral) of fibrocartilage that act as shock absorbers and help stabilise the joint
What is genu varum (bandy legs)?
Abnormality of knee alignment caused by loss of medial menisci
What is genu valgam (knock knees)?
Abnormality of knee alignment caused by loss of lateral menisci
Where are menisci thicker?
Peripherally where they are attached to the fibrous capsule
Where is the additional attachment of the medial menisci?
Peripherally attached to the tibial collateral ligament (makes it more vulnerable to tearing in knee injury)
What is an “unhappy triad” knee injury?
Lateral blow to knee that distracts and twists the medial aspect of the knee, and ruptures the ACL
What anchors both menisci posteriorly and anteriorly?
Attachment to the tibial intercondylar area