Dislocation of the MTP joint may occur as an isolated injury but more commonly it occurs in conjunction with other injuries. Typically the proximal phalanx dislocates dorsally. Because of the risk of neurovascular compromise, reduction should be performed as quickly as possible.
Mechanism of the dislocation
As a result of the dorsiflexing force the sling which connects the dorsal hood of the joint with the plantar plate ruptures and this allows the proximal phalanx to dislocate dorsally.