Concomitant ipsilateral subcapital and intertrochanteric fractures of the femur: a case report
© Loupasis et al; licensee BioMed Central Ltd. 2010
Received: 21 April 2010
Accepted: 15 November 2010
Published: 15 November 2010
We report the case of an unusual combination of concomitant subcapital and intertrochanteric fractures of the hip in a patient after a motorcycle accident. To the best of our knowledge, there is no previous report in the literature of these conditions as a result of high energy trauma or of the treatment used.
A 36-year-old Caucasian man was admitted with this rare fracture combination, and was managed with closed fracture reduction and fixation with a dynamic hip screw combined with an anti-rotational cannulated screw. We found four similar cases on reviewing the literature from 1989 to 2009, but these were reports of older patients after low energy injury.
We found that segmental fracture of the femoral neck region is an extremely rare and uncategorized hip injury that can occur not only in older people but also in young non-osteoporotic patients, and should be considered for inclusion in femoral fracture classification systems.
Subcapital femoral fractures secondarily complicating internal fixation of previous united intertrochanteric fractures have been infrequently reported in the literature [1–4]. Simultaneous presentation of ipsilateral neck and intertrochanteric femoral fractures are extremely rare, with only four such cases being reported in the literature during the period 1989 to 2009 [5–8]. All these cases occurred in older patients after a low energy injury.
We report a case of simultaneous ipsilateral subcapital and intertrochanteric fractures in a 36-year old man after a high-energy trauma from a road traffic accident. Based on our clinical experience, the small number of previously published similar cases, the lack of such a fracture pattern in any classification scheme, and a meticulous survey of orthopaedic textbook knowledge, we consider that this is an extremely rare fracture combination, and in terms of patient age, mechanism of injury and the treatment followed, it is to the best of our knowledge, the first such report in the literature.
A 36-year-old and otherwise healthy Caucasian man of Greek extraction was admitted to the hospital after been involved in a road traffic accident. Our patient was riding his motorcycle at an approximate speed of 70 mph. He collided head-on with a car, which caused him to be thrown from the motorcycle, landing forcefully on his outstretched left leg.
Neck and intertrochanteric fractures of the proximal femur occur predominantly after low-energy trauma in older patients with osteoporosis. The same type of fracture in young patients is usually associated with high-energy trauma.
Although these injuries are one of the most common causes of admission, mainly of older people, to orthopaedic departments, simultaneous occurrence of these fractures on the same side is an extremely rare situation, and only four cases have been reported previously in the literature [5–8]. All four cases concerned older patients who had sustained this unusual combination of fractures after a simple fall. In three of the four cases, the subcapital fracture was either not displaced or only slightly displaced, and the intertrochanteric fracture was displaced but could be classified as a stable injury (AO/OTA 31-A1) [6–8]. All four cases were managed either with closed reduction and osteosynthesis with DHS fixation combined with a cannulated screw, or with DHS fixation alone, with a good final result. In the fourth case, there was a combination of a comminuted intertrochanteric and displaced subcapital fracture, which was treated with a bipolar hemiarthroplasty and cerclage wires with a satisfactory outcome .
Our case is of interest because of the occurrence of such unusual combinations of fractures in a younger adult without osteoporosis occurring after high-energy trauma, a contrast to the previously reported cases, which have occurred in patients with osteoporosis. Full preservation of the femoral head should be the main goal of treatment of this complex injury in younger patients. Fixation with DHS supplemented with an anti-rotational cannulated screw should achieve this.
The healing process of the subcapital component of this complex fracture should not be expected to differ from that of an isolated femoral neck fracture. Both fracture lines in our case had an unusual pattern, indicating a different mechanism of injury from that of isolated subcapital or intertrochanteric fracture. Although we can only speculate as to the mechanism of this rare injury, it is likely that the subcapital fracture occurs first when the femoral neck impinges against the acetabulum as a result of an excessive flexion/external rotatory force to the hip. At this stage, if the forces are still not dissipated, a fracture in the intertrochanteric region can occur.
There have been some sporadic reports in the literature about non-concomitant combinations of both fracture types: a primary healed intertrochanteric fracture treated by various methods of fixation, with re-fracturing of the same hip through the femoral neck some time later [1–4]. Several theories have been postulated by various authors regarding the pathogenesis of this fracture pattern, such as inadequate implant fixation, imperfect reduction of the primary intertrochanteric fracture, and stress protection by the fixation device resulting in local osteoporosis [1, 3].
This report shows that segmental fracture of the femoral neck region is an extremely rare hip injury and can occur not only in the older person but also in younger patients without osteoporosis. Head-preserving and fixation methods should be attempted at all costs despite the combination of two fractures and the great possibility of vascular compromise, and a head-replacing method in a younger patient should be avoided. This unusual complex hip injury has not been previously categorized. Consideration should be given to its inclusion in femoral fracture classification systems.
Written informed consent was obtained from the patient for publication of this case report and accompanying images. A copy of the written consent is available for review by the Editor-in-Chief of this journal.
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