Knee Joint, Anterior and Lateral Leg Flashcards

1
Q

What kind of joint is the knee joint?

A

Synovial, hinge joint

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2
Q

How many articulations does the knee have and what are they?

A

3 articulations = 2 between femur and tibia, 1 between femur and patella

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3
Q

Does the fibula take part in the knee joint?

A

No

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4
Q

What are the main movements of the knee?

A
Flexion = mainly hamstrings and gastrocnemius, and tibial and common fibular nerve
Extension = mainly quadriceps and femoral nerve
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5
Q

When can there be medial and lateral rotation of the knee?

A

When the knee joint is flexed to 90 degrees

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6
Q

What carries out medial rotation of the knee?

A

Hamstrings and gracilis, tibial and obturator nerves

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7
Q

What carries out lateral rotation of the knee?

A

Biceps femoris , tibial and common fibular nerves

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8
Q

Where is the fibrous capsule of the knee?

A

Attaches round the margins of the articular cartilage and encloses the synovial cavity

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9
Q

What strengthens the fibrous capsule?

A

Ligaments

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10
Q

What are the ligaments which stabilise the knee joint?

A

Iliotibial tract, tibial (medial) and fibular (lateral) collateral ligaments, anterior and posterior cruciate ligaments

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11
Q

What are the menisci?

A

Crescentic discs (medial and lateral) of fibrocartilage that act as shock absorbers and help stabilise the joint

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12
Q

What is genu varum (bandy legs)?

A

Abnormality of knee alignment caused by loss of medial menisci

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13
Q

What is genu valgam (knock knees)?

A

Abnormality of knee alignment caused by loss of lateral menisci

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14
Q

Where are menisci thicker?

A

Peripherally where they are attached to the fibrous capsule

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15
Q

Where is the additional attachment of the medial menisci?

A

Peripherally attached to the tibial collateral ligament (makes it more vulnerable to tearing in knee injury)

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16
Q

What is an “unhappy triad” knee injury?

A

Lateral blow to knee that distracts and twists the medial aspect of the knee, and ruptures the ACL

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17
Q

What anchors both menisci posteriorly and anteriorly?

A

Attachment to the tibial intercondylar area

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18
Q

What are some features of the inner edges of the menisci?

A

Unattached to bone, very thin

19
Q

Where do the anterior and posterior cruciate ligaments get their name?

A

According to their site of attachment to the intercondylar eminence of the tibia

20
Q

Where do both cruciate ligaments attach?

A

Between the tibia and the femur (involved in maintaining joint stability)

21
Q

Where does the anterior cruciate ligament pass?

A

Superiorly, laterally and posteriorly to attach to the lateral femoral condyle

22
Q

What does the ACL prevent?

A

Anterior displacement of the tibia on the femur and hyperextension of the knee joint

23
Q

How are the ACL and ACL tested?

A

By the anterior and posterior drawer tests respectively

24
Q

Where is the posterior cruciate ligament located?

A

Medial to ACL and passes superiorly and anteriorly to attach to the medial femoral condyle

25
Q

What does the PCL prevent?

A

Posterior displacement of the tibia on the femur and helps prevent hyperflexion of the joint

26
Q

What is the suprapatellar bursa?

A

Extension of the synovial cavity

27
Q

What is the function of the suprapatellar bursa?

A

Reduces friction on the quadriceps tendon during knee movements

28
Q

What is detected is by the massage test?

A

Abnormal fluid within the suprapatellar bursa (causes swelling visible in the lower third of the anterior thigh)

29
Q

Why is the common fibular nerve vulnerable to injury in the anterior leg?

A

Enter superficial to neck of fibula

30
Q

What does the common fibular nerve divide into in the anterior leg?

A

Superficial fibular nerve and deep fibular nerve

31
Q

What does the superficial fibular nerve supply?

A

Muscle of the lateral leg and skin/fascia of dorsum of foot

32
Q

What does the deep fibular nerve supply?

A

Muscles of anterior leg and skin of first interdigital cleft

33
Q

Where do all the muscles of the anterior leg attach proximally?

A

Tibia, fibula or interosseous membrane

34
Q

What are the distal attachments of the muscles of the anterior leg?

A

Base of 1st metatarsal and medial cuneiform = tibialis anterior
Distal phalanx of great toe = extensor hallucis longus
Middle and distal phalanges of lateral 4 toes = extensor digitorum
Base of 5th metatarsal = fibularis tertius

35
Q

What movements do the muscles of the anterior leg perform?

A

Dorsiflexion of ankle, extension of great toe and digits

36
Q

What action does tibialis anterior aid in?

A

Helps tibialis posterior (posterior leg) with inversion of foot

37
Q

What action does fibularis tertius perform alongside fibularis longus and brevis (lateral leg)?

A

Eversion of foot

38
Q

What separates the anterior and lateral compartments of the leg?

A

Anterior intermuscular septum

39
Q

What is the smallest compartment of the leg?

A

Lateral leg

40
Q

What are the two muscles of the lateral leg?

A

Fibularis longus and brevis

41
Q

Where do the muscles of the lateral leg attach proximally?

A

The fibula, before passing to the plantar surface of the bases of the 1st fibularis longus) and 5th metatarsals (fibularis brevis)

42
Q

Where does the distal tendon of the fibularis longus pass?

A

Beneath the sole of the foot to reach the base of the 1st metatarsal

43
Q

What is the main action of fibularis longus and brevis?

A

Eversion of the foot