Comparison of Dynamic Knee Valgus During Single-leg Step Down Between People With and Without Pronated Foot Using Two-dimensional Video Analysis
Background: Considering the kinetic chain of the lower extremity, a pronated foot position (PFP) can affect malalignment of the lower extremity, such as a dynamic knee valgus (DKV). Although the DKV during several single-leg movement tests has been investigated, no studies have compared the diffe...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Korean Research Society of Physical Therapy
2021-11-01
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| Series: | Physical Therapy Korea |
| Subjects: |
| Summary: | Background: Considering the kinetic chain of the lower extremity, a pronated foot position
(PFP) can affect malalignment of the lower extremity, such as a dynamic knee valgus (DKV).
Although the DKV during several single-leg movement tests has been investigated, no studies
have compared the differences in DKV during a single-leg step down (SLSD) between subjects
with and without PFP.
Objects: The purpose of this study was to compare the DKV during SLSD between subjects
with and without PFP.
Methods: Twelve subjects with PFP (9 men, 3 women) and 15 subjects without PFP (12
men, 3 women) participated in this study. To calculate the DKV, frontal plane projection angle
(FPPA), knee-in distance (KID), and hip-out distance (HOD) during SLSD were analyzed by twodimensional
video analysis software (Kinovea).
Results: The FPPA was significantly lower in PFP group, compared with control group (166.4°
± 7.5° and 174.5° ± 5.5°, p < 0.05). Also, the KID was significantly greater in PFP group,
compared with control group (12.7 ± 3.9 cm and 7.3 ± 2.4 cm, p < 0.05). However, the
HOD not significantly differed between two groups (12.7 ± 1.7 cm and 11.4 ± 2.5 cm, p >
0.05).
Conclusion: The PFP is associated with lower FPPA and greater KID. When assess the DKV
during SLSD, the PFP should be considered as a crucial factor for occurrence of DKV. |
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| ISSN: | 1225-8962 2287-982X |