C Peshin, P Bhat, T Lal, P Singh
asymmetrical, bilateral, hip dislocation
C Peshin, P Bhat, T Lal, P Singh. Bilateral Asymetrical Hip Dislocation Due To An Unusual Mechanism. The Internet Journal of Orthopedic Surgery. 2008 Volume 11 Number 1.
Simultaneous anterior and posterior dislocation of both hips is extremely rare. We report a case of asymmetrical
bilateral dislocation of previously normal hips in a 65 year old female.
In this case, an unusual mechanism of injury resulting in such a pattern of dislocation is discussed.
A 65 year old female presented to the emergency room (ER) with bilateral hip trauma following collapse of a mound of
loose earth she was digging at. On admission, her left leg was fixed in flexion, internal rotation, and adduction,
while the right was in slight flexion, external rotation and abduction. There was no externally visible soft tissue or
bony injury of any other part. No associated visceral injury was present. Distal neurovascular status in both
the logs was normal. An anteroposterior radiograph of the pelvis showed a posterior dislocation of the left hip
and an anterior dislocation (Inferior / obturator) of the right hip. There was a fracture of superior pubic ramus
fracture of the right side and a split fracture of the inferior pubic ramus extending into the ischial ramus of
the left side. Both hips were reduced by closed manipulation under intravenous sedation in the E.R. within
1 hour of presentation. A post reduction radiograph confirmed concentric reduction of both the hip joints.
Patient was put on bilateral skeletal traction for 3 weeks after which traction was released and range
of motion (ROM) exercises were begain. Now at 7 weeks of follow up, she has a painless and complete ROM
at both the hip joints.
Simultaneous bilateral dislocation of the hip joints is a rare pattern of injury and asymmetrical involvement is even rarer, accounting for less than 0.8% of all hip dislocations (3, 9). Considerable amount of direct force transmitted longitudinally to the thigh is required to result in a dislocation at the hip, an intrinsically stable, joint by design. Most common causatine mechanism is high energy trauma during motor vehicle accidents (MVA). Often a result of dashboard injuries during a car crash, bilateral asymmetrical hip dislocation results from a peculiar "Wind Swept" position of the legs at the time of impact (8). Very few cases of such a pattern of dislocation at the hip are documented in the literature with almost all resulting from MVA's [1,2,3,5,7,8,9,10]*. In our case, the patient was sitting on the ground with the right leg in flexion and abduction at the hip and left in flexion and adduction. As the mound she was digging at collapsed, she was thrown down on her back with the hips in the same attitude, thereby resulting in an asymmetrical dislocation, i.e. anterior on the right and posterior on the left. Interestingly, there was no other major pelvic ring, spinal or visceral injury. This is almost similar to the mining or pit accidents, wherein, collapse of the roof of the mine results in such an injury. However, in contrast to the sold rock that causes such dislocations in a mining accident, in our case, it was the loose earth from the mound.
Traumatic dislocation of the hip are medical emergencies and early diagnosis with immediate reduction of the
dislocation is the key determinants of an excellent result. Avascular necrosis is reported to occur in 4% of hip
reduced within 6 hours and 58% of those that remained dislocated for more than 6 hours (4,6). In our
case, both the hips were reduced within 6 hours of trauma and follow up at 7 weeks shows a painless and full