In children, the cause of angular deformity after the treatment of distal humeral fracture is mainly not dew to the growth problem but the alignment of initial reduction state. The alignment of reduction status can be measured by numerous methods for anatomical reduction. The Baumann angle and lateral humero-capitellar angle are the most useful radiologic measuring methods for the evaluation of the anatomical configuration of distal humerus. But the determination of the straight line along the capitellar growth plate has some difficulties because the curved rounded capitellar shape may overlap the distal humeral metaphysis. So, 4 types classfication suggested by Williamson et. is used for determination of the line eith easy.

The Baumann angle is a valuable measurement method of distal humerus alignment, but as we know, there is no normal range data in Korean children. We measured the normal Baumann angle and lateral humero-capitellar angle using 112 cases normal elbow X-ray films and analysed its significanses.

The results are as follows:

1) The mean baumann angle is 69.2° with 6.2° standard deviation.

2) The mean lateral humero-capitellar angle is 45.3° with 8.2° standard deviation.

3) The Baumann angle and lateral humero-capitellar angle have no differences between ages, sexes, sidedness and types.

4) The 4 types classification by the shape of the capitellar growth plate is a realtively objective and useful method for the measurement of Baumann angle.

5) The Baumann angle has negative value coefficiency with lateral humero-capitellar angle.

It has been known that the hemiarthroplasty of the hip with bipolar prosthesis is the one of primary treatment methods for management of unstable intertrochanteric hip fracture, especially in severe osteoprotic patients. Additionally this operative treatment allows early full weight bearing and has many merits for the patient to return to the preinjury functional level. But we think that this operative method has several considerable points for the more effective treatment technique in unstable osteoporotic intertrochanteric fractures. We review the nine interochanteric comminuted fractture patients treated with bipolar prostheses at the Department of Orthopedie Surgery of Ewha Womans University Mok-Dong Hospital from September, 1993 to June, 1994. The considered points are as follows:

1) The difficult problem is to judge the intraoperative head-neck length. which is reduced by the tension of the fascia between gluteus medius and vastus lateralis fascia, preoperative measuring the head-neck length with transparent template, level of the tip of greater trochanter and prosthetic femoral head, and range of motion of hip of greater trochanter and prosthetic femoral head, and range of motion of hip joint under the tr1al reduction.

2) The operative approach is the other considerable point for the exposure of medial cortical buttress and lesser trochanter in reducing and maintaining principal fragments, and for the accurate anteversion angle of femur.

3) Bipolar hemiathroplasty technique is not effective in reducing the operative time and the blood loss amount in operative field, wspecially in comminuted interochanteric fracture treatment.