Given an abstract, generate a keyword (a noun phrase) that best describes the focus or contribution of the paper. Such keywords can be directly from the given abstract or outside it.
Q: Abstract: Two patients who sustained posterior and anterior fracture dislocations of the femoral head, respectively, are reported. Each case was treated by open reduction and internal fixation of the fracture fragments. With this operative approach excellent results have been achieved on medium-term followup.
A: 
Adult