2. Patella
Largest sesamoid bone in the body
Triangular shaped bone embedded within
quadriceps tendon
Primarily acts as an anatomical pulley for
quadriceps muscle
2
15. One of the most incongruent joints in the body
Stability depends on:
Static structures
Dynamic structures
Length of patellar tendon
Lateral lip of femoral condyle
Stability of Patella
15
17. Activities Patellofemoral Joint
Forces
Walking 0.5 X Body Weight
Ascending or
descending stairs
3.3 X Body Weight
Squatting 6-7 X Body Weight
Activities Quadriceps Forces
5 flexion 30% of Body Weight
30 flexion 2 X Body Weight
45 flexion 3 X Body Weight
75 flexion 6 X Body Weight
Forces in and around patella
17
19. Vertical position of patella:
Insall Salvati index
Normally : the ratio of patellar tendon to the
length of patella is 1:1
Variations:
Patella alta- high position of patella
Patellar baja- lower position of patella
19
26. References:
Norkin C, Levengie P. Joint structure and
function. 4th Edition
Neumann DA. Kinesology of musculoskeletal
system, Foundation for Physical Rehabilitation,
2nd Edition
Kapandji IA. The Physiology of Joints. Volume 2,
Lower Limb. 5th Edition
26
Notes de l'éditeur
Based on the direction of rotation of the apex of the patella
Based on the movement of anterior surface of the patella