The Relationship Between The Line Of Femoral Head Centers And The Height Of Greater Trochanters By Imaging Measurement

Objective:To observe the relationship between the line of femoral head centers and the height of greater trochanters on the normal pelvic X-ray film, in case of providing theoretical basis for the question of leg length discrepancy after total hip arthroplasty. Methods: 108 cases of the normal pelvic X-ray film were collected. The femoral head centers were measured by mose concentric with self-made. The line of bilateral femoral head centers was named A. It is recorded as "0" if A line just through the greater trochanter tips, recorded as "-" if A line above the greater trochanter tip, recorded as "+" if A line under the greater trochanter tip. The tips of left greater trochanter and right greater trochanter were named point b and b'respectively. The assumption was developed that the line of bilateral femoral head centers and greater trochanter tips are on the same straight line C. The cross point of C and the left greater trochanter was named point c, and the right was named point c'. The relationship between point b and c,point b'and c'were analyzed by statistics.The relationship between the line A and collodiaphyseal angle was observed.Results:In all the measured X-ray films, 31 cases were "0",41 cases were "+" , 36 cases were "-". The position of the line A has nothing to do with left and right limbs, age, gender, P>0.05. The relationship between point b and c,point b'and c'were not statistical differences. The position of the line A has something to do with collodiaphyseal angle.Conclusions:1 The relationship between the line of femoral head centers and the height of greater trochanters has nothing to do with left and right limbs, age, gender. 2 The line of bilateral femoral head centers through the tips of greater trochanter.3 The line of bilateral femoral head centers has something to do with collodiaphyseal angle.