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Dynamic hip screw

Dynamic hip screw (DHS) or Intramedullary Hip Screw is a type of intramedullary device (designed for intertrochanteric and subtrochanteric fractures) which allows controlled sliding of the femoral head screw within the IM nail gliding hole.

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Subcapital fracture; Garden's classification

Type I fractures have the best outcome. The bone ends are impacted into one another, which facilitates vascular re-growth.
Type II fractures are not impacted and are thus less stable. However there is minimal displacement of the bones from the anatomically normal position, and this is beneficial.
Type III fractures are complete but there is only partial displacement.
Type IV fractures are complete with total displacement. The two ends of bone are completely separated.

Fractures of type I & II are usually treated by internal fixation using a Dynamic hip screw.

References