Effect of lateral-wedge insole on the center of foot pressure and lower extremity muscle activity at gait initiation in patients with medial knee osteoarthritis.
Hiroshi Katoh
PMID 31645805WHAT IT FOUND
In women with medial knee osteoarthritis, a lateral-wedge insole increased forward foot-pressure movement at the start of walking compared with barefoot.
Backward movement was lower than in healthy women. Calf muscle timing was similar to healthy women. This was a small study.
Key findings
01In the medial knee osteoarthritis group, anterior center of foot pressure displacement at gait initiation was higher with the insole than barefoot.
02Posterior center of foot pressure displacement at gait initiation was lower in the medial knee osteoarthritis group than in the healthy group, whether barefoot or with the insole.
03Tibialis anterior muscle activity onset time at gait initiation was longer in the medial knee osteoarthritis group than in the healthy group, whether barefoot or with the insole.
STILL TO COME
How it was doneWhat they foundWhat it means for PTs
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What it does not show
Only 10 healthy females and 10 female patients with medial knee osteoarthritis were measured. The osteoarthritis group had Kellgren-Lawrence grade III in 6 and IV in 4, so the result may not apply to earlier osteoarthritis. The healthy group did not wear the insole, so the insole effect was not compared across healthy participants. The outcome was center of foot pressure and muscle onset time during the first step of gait initiation, not pain or function. The paper does not name a pre-specified primary outcome.
Declared interests
The authors declared no conflict of interest.
The easy way to misread this
Do not conclude that a lateral-wedge insole improves walking or pain in medial knee osteoarthritis. The study measured only the first step of gait initiation in 10 women with osteoarthritis, and the outcomes were foot pressure and muscle timing.