There are three options to manipulate and reduce the fragments.
Option 1: Direct digital manipulation.
Option 2: Manipulation using a temporary K-wire in the fragment as a joystick.
Option 3: Holding and manipulating the fragment with a small towel clamp or pointed reduction forceps.
A blunt Hohmann lever retractor is inserted gently into the anterior joint, and around the medial articular border.
The medial cartilage fracture line is visualized on the joint surface.
The fragment is reduced by one of the three options listed above, so that both cartilage fracture lines (on the fragment and the trochlea) are perfectly aligned.
5. K-wire fixation
Fix the fragment with two divergent 1.2 or 1.6 mm K-wires.
The first oblique K-wire is used as a joystick to achieve reduction and then advanced into the metaphysis. The oblique K-wire is used first as, once advanced, its position in the metaphysis is less critical, whereas the track of the transverse K-wire must be parallel to the medial physis and totally within the epiphysis.
The fragment is additionally fixed with a second K-wire inserted parallel to the ulnar physis and totally within the epiphysis.
The wires are either buried deep to the skin or cut outside the skin and bent over. The first option requires a second operation for removal, but the second option risks pin-track infection.
Note: In the older child with a visible ossific center in the trochlea, consideration can be given to an intraepiphyseal screw instead of the horizontal K-wire.
6. Postoperative care
With K-wire fixation it is recommended to apply a circular cast with posterior plaster splint for pain management and to prevent the use of the arm in younger children. In older children an arm sling is sufficient.
Note: In any case of elbow immobilization by plaster cast, careful observation of the neurovascular situation is essential both in the hospital and at home.