Meniscus

Question 1

Anatomical difference of Medial and lateral meniscus

Answer 1

MM: Asymmetric C-shape

LM: Semicircular in shape with anterior and posterior horns attaching closer than MM

Question 2

Blood supply of meniscus

Answer 2

Superior and inferior branches of lateral, medial and middle genicular arteries

Peri meniscus capillary plexus supply peripheral border of menisci

Question 3

Histology of meniscus

Answer 3

70% water
Type 1 collagen (90%)

Question 4

Function of meniscus

Answer 4

Load transmission across knee - 85-90% in flexion, 50-70% in extension

AP stabilisation of knee- in ligamentously compromised knee

Enhancement of articular conformity

Distribution of synovial fluid across articular surface
Proprioception

Question 5

When to repair for meniscus tear

Answer 5

Significant pain/ mechanical symptoms eg: Catching/ locking

Location: Large tear >1cm located in red-red zone, and some tears in red-white zone

Tissue quality: Not macerated/ severely degenerated

Concomitant injury: Planned for ACL reconstruction