To evaluate the curative effect and complication of the developmental dislocation of the hips (DDH) in children with traditional spicacast immobilization and modified semi-hardened polymer bandage spica immobilization.

Sixty-two DDH children in Children's Hospital of Chongqing Medical University with a total of 75 hips were enrolled in this study. In the cast group, 30 children with a total of 35 hips were treated with the traditional spica cast immobilization method. In the modified group, 32 children with a total of 40 hips were treated with modified semi-hardened polymer bandage. Inclusion criteria: the first diagnosis of developmental dislocation of the hip, age≤24 months, treatment with human plaster fixation. Exclusion criteria: reduction age>24 months, closed reduction failure, other treatments have been adopted outside the hospital, clinical data are incomplete or follow-up time is less than 24 months. All the children underwent imaging and hip function evaluation. The irritability, anxiety, and crushing of the skin occurred when the patient was removed cast. Chi-square test was used for the ratio of male to female, the excellent and good rate, irritability, anxiety, skin pressure, and femoral head necrosis. The age, weight, follow-up time and acetabular index of the two groups of children were tested by independent t-test. The T?nnis scale was analyzed by non-parameter verification.

The average follow-up time of the plaster group were (31.2±4.2) months, and the average follow-up time of the modified group were (32.2±5.5) months. There was no significant difference between the groups (t=0.87, P>0.05). According to Zhou Yongde evaluation criteria of developmental dislocation of hip joint, the rate of excellent and good rank was 88.6% in cast group and 87.5% in improved group. There was no significant difference between the two groups (χ²=0.02, P>0.05). The incidence of avascular necrosis was 17.1% in the cast group and 12.5% in the modified group. There was no significant difference between the groups (χ²=0.32, P>0.05). In the cast complications of skin crush, cast group and the improvement group no significant difference (χ²=1.40, P>0.05). However, when removing cast caused irritability and anxiety in children, the modified group was significantly lower than the cast group (χ²=43.75, P<0.01).

Modified semi-hardened polymer bandage immobilizations for the treatment of DDH has the same therapeutic effects and complications in the development of dislocation of the hip compared with traditional cast fixation, but significantly reduce irritability, anxiety and complete anxiety in children with cast removal. The use of plaster saws and related risks are completely avoided.