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Orthotic effect on metatarsophalangeal joint extension. A preliminary study
T E Kilmartin1, W A Wallace, T W Hill
1Northampton School of Podiatry, England.
Journal of the American Podiatric Medical Association
|August 1, 1991
Summary
Modified Root orthoses slightly reduce first metatarsophalangeal joint extension. This controlled motion may benefit early hallux rigidus by potentially slowing subchondral sclerosis development.
Area of Science:
- Biomechanics
- Orthopedics
- Podiatry
Background:
- First metatarsophalangeal (MTP) joint motion is crucial for gait.
- Hallux rigidus involves degenerative changes in the first MTP joint.
- Orthotic interventions aim to modify joint mechanics.
Purpose of the Study:
- To quantify the effect of modified Root orthoses on first MTP joint extension.
- To assess the impact of footwear on first MTP joint motion.
Main Methods:
- Dynamic motion analysis using bone markers in the first metatarsal and hallux.
- Measurement of first MTP joint extension in barefoot, plimsoll, and orthotic conditions.
Main Results:
- Maximum first MTP joint extension was observed barefoot (mean 62 degrees).
- Plimsolls reduced extension to 57 degrees.
- Modified Root orthoses further reduced extension to 55 degrees.
Conclusions:
- Functional orthoses provide a marginal reduction in first MTP joint extension.
- This controlled motion may offer therapeutic benefits for early hallux rigidus.
- Restricting motion could potentially slow the progression of subchondral sclerosis.
