[Design of ABC damage variable and positioning system for acetabular fractures and 1122 cases multi-center statistic analysis].

Objective: To design ABC damage variable and positioning system for acetabular fracture and explore the feasibility and clinical practical value of the system through the multi-center analysis of 1122 acetabular fractures.

Methods: According to acetabular three-column conception, and pelvic ring lesions damage direction caused by acetabular fracture domino effect and injury degree of proximal femur joint, it defined class A as any column acetabular fracture; class B as any two-column acetabular fracture; class C as front, dome and posterior mixture acetabular fracture. Lower case English letters a, m, p represented front, dome, posterior fracture, respectively.

[A comparisive study between intramedullary interlocking nail and plate-screw fixation in the treatment of tibial shaft fractures].

Objective: To evaluate the effects of tibial shaft fractures treatment with plate-screw or intramedullary interlocking nail.

Methods: Thirty-five fractures were treated with intramedullary interlocking nail. Tape A, B and C were 11, 18 and 6 cases respectively according to AO classification.

[A method to avoid the fixator failure by using pedicle screw combined vertebroplasty for spine fractures].

Objective: To study a new implant material (carbonated hydroxyapatite, CHA) united pedicle screw to cure spine fracture.

Methods: Thirty-two cases of spine compressed fracture were used with pedicle screw fixator and vertebroplasty. Before operation, patients' vertebral body were compressed (46 + 21)% (20% approximately 70%) on average.

[Clinical research of hemiprosthesis arthroplasty for the treatment of unstable intertrochanteric fractures in elderly patients].

Objective: To report the clinical results of hemiprosthesis for unstable intertrochanteric fractures in elderly patients.

Methods: 86 cases (male 35 and females 51) of unstable intertrochanteric fractures in elderly patients were treated with hemiprosthesis arthroplasty in our hospital. The average age was 87 years old (range from 80 to 98 years old).