The Journal of Bone and Joint Surgery, Vol 76, Issue 2 230-236, Copyright © 1994 by Journal of Bone and Joint Surgery, Inc
Loss of bone in the proximal part of the femur following unstable fractures of the leg
HE Van der Wiel, P Lips, J Nauta, P Patka, HJ Haarman and GJ Teule
Department of Endocrinology, Free University Hospital, Amsterdam, The Netherlands.
We evaluated the subsequent loss of bone from the proximal part of the
ipsilateral and contralateral femora and from the lumbar spine of seven men
and nine women who had a fracture of the tibia. The average age was sixty
years. All of the fractures were unstable, and the involved leg bore no
weight for an average of eight weeks. The bone mineral density was measured
with dual-energy x-ray absorptiometry of the lumbar spine and of the
femoral neck and the trochanteric region of both hips immediately after the
fracture, after the period of immobilization, and at approximately three,
six, and twelve months after the fracture. During the period of
immobilization, the bone mineral density of the trochanteric region
decreased an average of 9 +/- 7 per cent on the side of the fracture,
compared with the value immediately after the fracture, but there was no
change on the contralateral side (p < 0.01). At twelve months, the
average decrease in the trochanteric area was 15 +/- 10 per cent on the
side of the fracture, compared with the value immediately after the
fracture, but again there had been no change on the uninjured side (p <
0.01). The bone mineral density of the femoral neck on the side of the
fracture had decreased 6 +/- 6 per cent at twelve months, compared with a
decrease of 2 +/- 4 per cent on the uninjured side (p < 0.05). The bone
mineral density of the lumbar spine decreased only during the period of
unloading of the fractured leg (1 +/- 2 per cent, p = 0.01).(ABSTRACT
TRUNCATED AT 250 WORDS)