Inverted
Rearfoot
posture
Inverted Rearfoot posture in subjects with
coexisting patellofemoral osteoarthritis in
medial knee osteoarthritis:
an exploratory study
Results: On average, patients with
Abstract Background: While abnormal
rearfoot posture and its relationship
coexisting PFOA and medial TFOA (n=39)
to patellofemoral (PF) pain has been
had an inverted calcaneus 3.1° greater
thoroughly discussed in the literature, its
than those with isolated medial TFOA
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relationship to patellofemoral osteoarthritis
(n=29). Increased calcaneus inverted angle
(PFOA) has not been determined. This study
was significantly associated with a higher
aimed to examine whether rearfoot posture
probability of the presence of medial PFOA
is associated with a higher prevalence
(odds ratio: 1.180, 95% confidence interval:
of radiographic PFOA in a compartment-
[1.005, 1.439]; p=0.043). Calcaneus inverted
specific manner in patients with medial
angle was not associated with higher odds
tibiofemoral osteoarthritis (TFOA).
of lateral PFOA presence based on the
Methods: Participants from orthopedic
clinics (n=68, age 56–90 years, 75.0%
female), diagnosed with radiographic medial
TFOA (Kellgren/Lawrence [K/L] grade≥2)
were included in this study. The presence
of PFOA and static rearfoot posture were
evaluated using a radiographic skyline view
and a footprint automatic measurement
apparatus, respectively. The relationship
between rearfoot posture and PFOA was
examined using analysis of covariance and
propensity scoreadjusted logistic regression
analysis.
adjusted values.
Conclusions: The presence of an inverted
rearfoot was associated with PFOA.
Although these findings do not clearly
indicate a biomechanical link between
rearfoot posture and PFOA, this study shed
light on the potential relationship between
altered rearfoot posture and PFOA, as can
be seen between rearfoot abnormality and
PF pain.
By Hirotaka Iijima 1,2,3* , Hiroshi Ohi 4,5 , Naoto
Fukutani 2 , Tomoki Aoyama 2 , Eishi Kaneda 6 , Kaoru
Abe 4 , Masaki Takahashi 1 and Shuichi Matsuda 7