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HOW STRONG IS THE
MPFL?
(Table 1)
MPLF Elongation to failure: mean 25.8mm,
standard deviation 6.6, range 14 to 34 [1].
Graft stiffness (change in length/ ultimate
load) likely matters.
MPFL ATTACHMENT SITES –
ISOMETRIC/ISOANATOMIC
There is no evidence to date that the MPFL
functions isometrically. MPFL is most loaded
(longest) in full extension
with quads loaded.
With quads relaxed, the “longest” length of
the MPFL thru ROM is debated. By 60°, mor-
phology of the patellofemoral joint contains
the patella in normal knees (figs. 3 & 4).
13
es
JOURNÉES LYONNAISES DE CHIRURGIE DU GENOU
38
Fig. 2
Tissue
Number of
Ultimate
Stiffness
Reference
Specimens
Load (N)
(N/mm)
Semi-tendinous
11
1216 ± 50
186 ± 9
Noyes et al., 1984
Fascia lata
18
628 ± 35
118 ± 5
Noyes et al., 1984
Gacilis
17
838 ± 30
171 ± 11
Noyes et al., 1984
MPFL
10
208 ± 90
8
Amis, 2003
MPFL
12
146 ± 49
18.9 ± 1.3
Arendt, 2007
Table 1 : Comparison of Structural Properties of Various
Autograft Tissues Commonly Used for ACL Reconstruction
Fig. 3
Fig. 4