The interdigital plantar ligaments are fibrous bands connecting adjacent lesser toe proximal phalanges at the plantar MTP level, working alongside the deep transverse metatarsal ligament to maintain toe alignment.
Resist toe splay during forefoot loading, maintain relative toe position, and contribute to plantar forefoot stability during push-off.
Interdigital ligament insufficiency from longstanding rheumatoid or neuropathic disease allows forefoot splay. Interdigital neuroma surgery divides the deep transverse metatarsal ligament above these structures — preserving the interdigital ligaments contributes to forefoot stability.
Progressive ligament attenuation from rheumatoid arthritis or neuropathy producing forefoot widening and MTP subluxation, managed by forefoot arthroplasty.
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