In some specific cases (eg, large fragments, or a bigger defect on the femoral head), surgical hip dislocation can become necessary for removal of the fragment. Surgical hip dislocation also facilitates reattachment of the fragment, or corrective osteotomy to reorientate the intact part of the femoral head into a good loading position.
3. Open capsulotomy
Removal of fragments
After the capsulotomy, the joint is irrigated and large fragments are picked out using forceps, pituitary rongeurs etc.
All fragments identified on the preoperative MRI should be accounted for.
Subluxation by traction, with internal and external rotation, is useful for visualization of the joint and to free trapped fragments.
Irrigation of the subluxed joint will often flush out hidden fragments.
For larger fragments, complete hip dislocation may be necessary.
Image intensification should be used to confirm concentric reduction.
History: A 7-year-old boy sustained a ski injury while jumping over a bump and landing directly on the hip.
The right hip was dislocated.
After reduction, the joint space was asymmetric and a fragment was seen in the joint space.
This is an absolute indication for removal of the fragment.
4. Protected weight bearing
After surgical stabilization, the construct should be sufficiently robust to allow protected weight bearing. Smaller children may not be able to comply with this and may need immobilization.
Forces through the hip are less with toe-touch weight bearing than with no weight bearing. Therefore, toe-touch is normally recommended for initial mobilization. This needs to be taught to children by a physiotherapist.
Range of movement
Range-of-movement exercises should start in the immediate postoperative period to prevent stiffness. Surgeons should indicate if any extremes of movement are forbidden.
Having started with toe-touch weight bearing, children progress to partial weight bearing and then to full weight bearing according to their age and the predicted rate of healing of their fracture. Even older adolescents should be fully weight bearing without aids at three months.
Swimming can be allowed as soon as partial weight bearing is permitted. Contact sports should be avoided for at least six months.
X-rays are generally taken immediately after the surgery and at 6 and 12 weeks.
Implants that cross the physis should be removed if there is significant growth remaining. The fracture should be healed and consolidated prior to removal (see Healing times).
Implants in young children should always be removed to prevent them from being covered by bony overgrowth.