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Combined varus and plantar malunion
26%
680/2658
Isolated varus malunion
15%
409/2658
Isolated valgus malunion
3%
67/2658
Isolated dorsal malunion
49%
1312/2658
Isolated plantar malunion
6%
169/2658
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Figure A displays a Hawkins Type 2 talar neck fracture. (Hawkins classification shown in Illustration A). Malunion after inaccurate reduction of talar neck fractures has a reported incidence as high as 32%, with varus malunion occurring most frequently. Dorsal malunion can occur when the body is not properly derotated during reduction and the head fragment remains dorsal to the body. Dorsal malunion can lead to symptomatic impingement of the dorsal surface of the talus on the distal tibia and restriction of ankle dorsiflexion. Canale found that 3 of the 4 patients with dorsal malunion improved following dorsal beak resection of the talar neck. Patients with varus malunion have decreased subtalar range of motion(especially eversion), walk with the foot internally rotated, and often complain of excessive weight bearing on the lateral border of the foot. Level 4 evidence from Canale and Kelly found that varus malunion occurred most frequently in Hawkins type 2 fractures that had been treated in a closed manner.
2.5
(77)
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