Effects of the airlift PTTD brace on foot kinematics in subjects with stage II posterior tibial tendon dysfunction
STUDY DESIGN: Experimental laboratory study. OBJECTIVES: To investigate the effect of inflation of the air bladder component of the AirLift PTTD brace on relative foot kinematics in subjects with stage II posterior tibial tendon dysfunction (PTTD). BACKGROUND: Orthotic devices are commonly recommended in the conservative management of stage II PTTD to improve foot kinematics. METHODS AND MEASURES: Ten female subjects with stage II PTTD walked In the laboratory wearing the AirLift PTTD brace during 3 testing conditions (air bladder inflation to 0, 4, and 7 PSI [SI equivalent: 0, 27579, and 48263 Pa]). Kinematics were recorded from the tibia, calcaneus (hindfoot), and first metatarsal (forefoot), using an Optotrak motion analysis system. Comparisons were made between air bladder inflation and the 0-PSI condition for each of the dependent kinematic variables (hindfoot eversion, forefoot abduction, and forefoot dorsiflexion). RESULTS: Greater hindfoot inversion was observed with air bladder inflation during the second rocker (mean, 1.7°; range, -0.7° to 6.1°). Less consistent changes in forefoot plantar flexion and forefoot adduction occurred with air bladder inflation. The greatest change toward forefoot plantar flexion was observed during the third rocker (mean, 1.4°; range, -3.8° to 3.9°). The greatest change towards adduction was observed during the third rocker (mean, 2.3°; range, -3.4° to 6.5°). CONCLUSIONS: On average, the air bladder component of the AirLift PTTD brace was successful in reducing the amount of hindfoot eversion observed in subjects with stage II PTTD; however, the effect on forefoot motion was more variable. Some subjects tested had marked improvement in foot kinematics, while 2 subjects demonstrated negative results. Specific foot characteristics are hypothesized to explain these varied results.
Journal of Orthopaedic and Sports Physical Therapy
Neville, Christopher; Flemister, A. Samuel; and Houck, Jeff, "Effects of the airlift PTTD brace on foot kinematics in subjects with stage II posterior tibial tendon dysfunction" (2009). Faculty Articles Indexed in Scopus. 1630.