Objective:to explore the clinical curative effect of treatment for the traumatic arthritis developed from fracture of acetabulum with metal on metal hip replacement.Methods:a total of 11 cases(aged from 31～55

averaged 43.2 and the mean body mass index was 24±2.3

with a range between 20.3 and 29.2)of traumatic arthritis developed from open reduction and internal fixation for the fracture of acetabulum were admitted from September 2003～April 2007

among which 9 cases were male

2 female

and the aetiology of the acetabular fractures could be classified as follows:traffic accident trauma in 8 cases were

high falling injury in 2 cases

heavy pound in 1 case.According to the Letournel classification

there are 3 cases of posterior column accompanied with posterior wall fracture

2 cases of posterior wall accompanied with posterior dislocation

2 cases of transverse accompanied with posterior wall

2 cases of both column

one cases of posterior wall and one cases of transverse fracture.All the cases were examined before the former and this operation respectively by X-ray and 3D CT to evaluate the fracture configuration and the bone defect.The involved hip function was evaluated according to the Harris score pre-and 2 years postoperatively.Results:All the incisions healed by first intension

and no complications like dislocation

nerve and blood vessel injury were developed.All the 11 cases were followed up

time ranged from 24 to 67 months

and averaged 38.5± 9.5 months.According to the Harris score system

the involved hip function showed excellent result in 2 cases

satisfactory in 8 cases

poor in one case

and the excellent and the satisfactory cases accounted for 90.1%.Conclusion:Metal on metal hip replacement for the traumatic arthritis developed from fracture of acetabulum could preserve the hip function with less complications

which makes the patients satisfied and deserves clinical expansion.