関節リウマチによる中足骨趾節間関節症患者の足底分圧に対する足関節吊り下げ型アーチパッドの効果について

Efficacy of Arch Pads with Ankle Strapping in Redistributing Plantar Pressure in Rheumatoid Arthritis Patients with Metatarsalgia

　中足骨趾節間関節(MTP関節)症を有する15例の関節リウマチ(RA)患者群と，年齢や性の分布を一致させた15例の健常群を対象に，吊り下げ型アーチパッドを装着した場合のMTP関節を含めた前足部への減圧効果を，装具装着前や従来の中敷き型アーチパッド装着による変化と比較した．装具装着による前足部分圧の減少および中足部分圧の増加する割合は，吊り下げ型アーチパッド装着時のほうが従来型アーチパッド装着時よりも有意に高値を示した．このため，RAによるMTP関節痛を有する患者には，従来型アーチパッドよりも新型アーチパッドのほうが前足部荷重減少効果が強いと結論した．

　This study was designed to evaluate the redistribution of foot pressure when rheumatoid arthritis (RA) patients with metatarsalgia wore an arch pad with ankle-strapping or an inserted arch pad.　Foot pressure with and without arch pads was measured in 15 RA patients with metatarsalgia and 15 age-matched healthy subjects without foot pain (control group).　Foot pressure under the hindfoot and the forefoot wearing the arch pad was lower than without the arch pad in the both the RA patients and control group, but foot pressure under the midfoot wearing the arch pad was higher than without the arch pad.　The decreasing ratio of pressure in the forefoot and increasing ratio in the midfoot were significantly greater when wearing the arch pad with ankle-strapping than when wearing the inserted arch pad.　We concluded that wearing the arch pad with ankle-strapping would enhance the beneficial biomechanical effect of inserted arch pads.