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Patellofemoral joint

Author: Derek Moore

Topic updated on 03/08/11 5:58pm

Function
- increase moment arm of quadriceps
- fully engaged at 40 degree
- Forces 3-5 x BW
Anatomy
- thick cartilage (5 mm)
- two facets (medial and lateral)
Stability
- patella is restrained by
  - valgus axis of quadriceps mechanism (Q angle)
  - oblique fibers of vastus medialis and lateralis
  - patellofemoral ligament (MPFL)
    - medial patellofemoral ligament is the key restraint to lateral displacement
      - goes from medial border of patella to adductor tubercle
      - adherent to vastus medialis

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ABOS II: Patellofemoral joint

General - Oral Boards Review

7/29/2011

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