Popliteal fossa Flashcards Preview

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Flashcards in Popliteal fossa Deck (15):
1

Superiolateral border

Biceps femoris

2

Inferiomedial border

Medial head of gastrocnemius

3

Inferiolateral border

Lateral head of gastrocnemius and plantaris

4

Floor

Posterior surface of knee joint capsule and femur

5

Roof

Popliteal fascia and skin

6

Contents medial to lateral

Popliteal artery (deepest),
Popliteal vein,
Tibial nerve,
Common fibular nerve

7

Superiomedial border

Semimembranosus

8

What are the causes of a mass in popliteal fossa

Baker's/popliteal cyst
Popliteal aneurysm
DVT
Adventitial cyst of popliteal artery
Various neoplasms e.g. Rhabdomyosarcoma

9

What is a baker's cyst

Inflammation and swelling of semimembranosus bursa in the knee joint

10

What does baker's cyst usually arise in conjunction with

Rheumatoid arthritis or osteoarthritis of the knee

11

Consequence of baker's cyst

Usually resolves
Cyst can rupture and produce symptoms similar to DVT

12

What is an aneurysm

Dilation of artery >50% of normal diameter

13

Why do popliteal aneurysms affect contents of popliteal fossa

Popliteal fascia is tough and non-extensible

14

Consequence of popliteal aneurysm

Tibial nerve can be compressed
This leads to leg anaesthesia or loss of leg motor function

15

How are popliteal aneurysms detected

By palpable pulsation in popliteal fossa with abnormal arterial sounds

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