83 Hip and Femur Injuries Philip Bossart
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1 83 Hip and Femur Injuries Philip Bossart KEY POINTS Most hip fractures result from ground-level falls in patients with osteoporosis. Patients with intertrochanteric fractures can experience significant blood loss into the thigh and may require fluid or blood resuscitation. Hip dislocations and femoral fractures are often caused by high-energy trauma such as motor vehicle collisions and falls from heights; associated injuries are therefore common and should always be looked for. Computed tomography is more sensitive than radiography in detecting fractures and can be considered when radiographs appear to be negative and clinical suspicion for fracture is present. Emergency physicians may relocate hip dislocations in the emergency department; however, most hip and femoral fractures require orthopedic consultation and operative repair. EPIDEMIOLOGY Approximately 300,000 hip fractures occur each year in the United States, 1 and this number is projected to increase significantly as the population ages. The major cause of hip fractures is ground-level falls in elderly patients with osteoporosis. Hip injuries are a major cause of morbidity and mortality, especially in the elderly, in whom 1-year mortality after a hip fracture is approximately 25%. Femoral shaft and distal femoral fractures are usually the result of high-energy trauma such as motor vehicle collisions and falls from heights, and thus open wounds and associated traumatic injuries are common. PATHOPHYSIOLOGY The leading cause of hip fractures is falls in elderly people with underlying osteoporosis. Osteoporosis is a common condition in the elderly, and its incidence increases with advancing age. After about the age of 30, bone resorption slowly begins to exceed bone formation, and as a result bone mass and bone strength lessen. The lifetime risk of fracturing a hip is about 17% in white women and 5% in white men. 2 The major cause of hip dislocations is motor vehicle collisions. A great deal of force is required to dislocate a hip, and thus associated injuries are common. Up to 88% of hip dislocations will be accompanied by an associated fracture. 3 Patients with hip dislocations have about a 25% risk for osteoarthritis and a 20% risk for avascular necrosis. In addition, sciatic nerve injuries occur in approximately 10% to 14% of patients with posterior hip dislocations. 4 These risks may be decreased by prompt diagnosis and treatment in the emergency department (ED). Osteonecrosis (also known as aseptic necrosis, ischemic necrosis, or avascular necrosis) may be caused by acute disruption of the blood supply to the femoral head as a result of a hip fracture or dislocation. Fractures of the femoral neck can also disrupt the blood supply and result in osteonecrosis. Other causes are sickle cell disease, barotrauma, radiation therapy, chemotherapy, atherosclerosis, and Gaucher disease. Associated conditions include steroid use, excessive alcohol consumption, smoking, connective tissue diseases, pancreatitis, and chronic liver and renal diseases. 5 The incidence of osteonecrosis after hip dislocation depends on the degree of trauma involved and the duration of the dislocation. Some data suggest that reduction of the hip within 6 hours after dislocation decreases the incidence of osteonecrosis. 6 Therefore, every effort must be made to relocate dislocated hips as soon as possible. Femoral neck fractures are also associated with a high incidence of osteonecrosis. It is thought that the synovial fluid around the fracture site interferes with normal bone healing. Intertrochanteric fractures and other more distal fractures of the femur are rarely complicated by osteonecrosis. ANATOMY The hip joint is a ball-and-socket articulation located between the femoral head and the acetabulum. The ligamentum teres, the capsular ligaments, and the proximal muscles of the leg make the hip a stable joint that requires very strong force to dislocate it. The femur is the largest and strongest bone in the body. The femoral neck is about 8 to 10 cm in length. The intertrochanteric line is an oblique line that connects the greater trochanter and the lesser trochanter and marks the junction of the femoral neck and the shaft. The muscles of abduction (gluteus medius and gluteus minimus) insert on the laterally located greater trochanter, and the muscles of flexion (iliopsoas) insert on the medially located lesser trochanter. The major blood supply to the head 726
2 CHAPTER 83 Hip and Femur Injuries and neck of the femur is the medial and lateral circumflex arteries, which are branches of the femoral artery. The hip region has approximately 18 bursae. The most common source of hip pain and inflammation is the deep trochanteric bursa, which lies between the gluteus maximus and the greater trochanter. PRESENTING SIGNS AND SYMPTOMS Pain is the most common complaint in patients with hip problems. 7 The location and character of the pain are very helpful in making a diagnosis. Increased pain during and after weight bearing and improvement with rest suggest a structural joint problem such as osteoarthritis. Constant pain, unrelated to use, suggests an infectious, inflammatory, or neoplastic process. Lateral hip pain, especially with tenderness over the greater trochanter, suggests trochanteric bursitis. Lateral hip pain with paresthesias suggests meralgia paresthetica lateral femoral cutaneous nerve entrapment. This condition is characterized by a local area of pain (often burning or dysesthesia) that is not influenced by direct pressure on the hip or back movement. Anterior hip or groin pain made worse by joint motion suggests a problem with the hip joint, such as osteonecrosis, occult fracture, synovitis, or a septic joint. Anterior hip pain that is not made worse by hip motion or weight bearing suggests an inguinal hernia, lower abdominal pathology, or referred lumbar nerve root pain. Posterior hip pain suggests sacroiliac joint inflammation, lumbar radiculopathy, or herpes zoster. Anterior thigh pain may be secondary to injury to the hip joint or femur, stress fracture of the femoral neck, or lumbar radiculopathy. For the AP view, the patient is placed supine with about 15 degrees of internal rotation of the feet. For the lateral view, the patient is placed supine with the uninvolved hip flexed and abducted. The radiograph cassette is placed against the lateral aspect of the affected leg, and the x-ray beam is directed horizontally toward the groin with 20 degrees of cephalic tilt. Frog-leg views of the pelvis should not be ordered if hip fracture or dislocation is a possibility. HIP FRACTURES Hip fractures are classified as intracapsular or extracapsular. Intracapsular fractures include femoral head and femoral neck fractures (Fig. 83.1). These fractures are further categorized as either displaced or nondisplaced. Extracapsular fractures include intertrochanteric and subtrochanteric fractures, as well as the less common greater and lesser trochanteric fractures. These fractures can be further categorized by the degree of comminution. DIFFERENTIAL DIAGNOSIS AND MEDICAL DECISION MAKING See Box Femoral head fracture Femoral neck fracture DIAGNOSTIC TESTING Anteroposterior (AP) and lateral radiographs of the hip are usually sufficient to diagnose hip dislocations and fractures. BOX 83.1 Differential Diagnosis of Hip Pain Bursitis Osteoarthritis Hip dislocation Hip fracture Meralgia paresthetica Lumbar radiculopathy Osteonecrosis Acute synovitis Septic arthritis Herpes zoster Stress fracture of the femoral neck Aortoiliac occlusive disease Sacroiliac joint disease Intertrochanteric fracture Subtrochanteric fracture Greater trochanter fracture Lesser trochanter fracture Fig Types of hip fractures. 727
3 SECTION VIII TRAUMATIC DISORDERS FEMORAL HEAD FRACTURES These relatively uncommon fractures usually occur in conjunction with hip dislocations in young people involved in motor vehicle collisions. Because these fractures may not be visualized on plain radiographs, computed tomography or magnetic resonance imaging may be necessary for diagnosis. FEMORAL NECK FRACTURES Fractures of the femoral neck, which is located between the femoral head and the trochanters, occur within the joint capsule and include subcapital fractures (fractures through the fused epiphyseal plate). These fractures are common and usually occur secondary to ground-level falls in older patients with osteoporosis and in young people involved in motor vehicle collisions. This area of the femur has relatively little cancellous bone and very thin or absent periosteum; in addition, blood supply to the femoral head may be disrupted. As a result, degenerative changes involving the femoral head and frank avascular necrosis are common after these fractures. 8 Because patients may be able to bear weight with some of these fractures, radiologic examination is important even if the patient is able to walk. Most femoral neck fractures can be treated by open reduction and internal fixation. Early surgical correction, usually within 12 hours, reduces the incidence of aseptic necrosis. INTERTROCHANTERIC FRACTURES Intertrochanteric fractures are extracapsular injuries and are the most common type of hip fracture. The majority occur in elderly patients with osteoporosis as a result of ground-level falls. About 80% are comminuted fractures. Because patients cannot bear weight, the diagnosis is probably evident clinically and usually easily confirmed with an AP radiographic view of the hip. Patients with intertrochanteric fractures may lose as much as 1 to 2 L of blood, and therefore intravenous crystalloid infusion or blood transfusion may be necessary. Affected patients are typically elderly and frail; ED evaluation includes determining the reason for the fall (e.g., syncope, near-syncope, transient ischemic attack), as well as evaluation for other significant medical problems. The treatment of choice is surgical repair; however, because avascular necrosis is uncommon, surgery does not have to be performed immediately. Medical and postoperative complications are common, and about one third of these patient die within 1 year of the injury. GREATER TROCHANTERIC FRACTURES Fractures of the greater trochanter are uncommon. In adults they are generally the result of direct trauma; in children they are usually secondary to muscle avulsion. These fractures may be difficult to visualize on radiographs. Fractures caused by direct trauma are generally comminuted but not displaced; those caused by avulsion are usually displaced but not comminuted. If displacement is greater than 1 cm, open reduction with internal fixation is often recommended. However, most of these fractures are generally minimally displaced and do not need surgery. If plain radiographs are uninformative, computed tomography or magnetic resonance imaging may be needed to make the diagnosis. LESSER TROCHANTERIC FRACTURES Fractures of the lesser trochanter typically occur in people younger than 20 years. If they occur in adults, a pathologic fracture should be suspected. The usual mechanism is forceful contraction of the iliopsoas muscle during strenuous activity. Patients are unable to lift the affected leg when in the sitting position. Treatment is usually bed rest. SUBTROCHANTERIC FRACTURES Subtrochanteric fractures are defined as fractures between the lesser trochanter and a point 5 cm distally. They are associated with severe trauma in young people or mild trauma in people with pathologic bone disease. Like intertrochanteric and midshaft femoral fractures, these fractures can be associated with significant blood loss. In addition, associated injury to the profunda femoris artery, branches of the lateral circumflex artery, the lateral femoral cutaneous nerve, and the femoral nerve is possible. If the patient has severe swelling in the proximal part of the thigh, angiography or duplex scanning should be performed to look for a vascular injury. Treatment consists of open reduction and internal fixation. Because of the large stress forces in this area, nonunion is a relatively common complication. FEMORAL SHAFT FRACTURES The diagnosis of femoral shaft fractures is usually obvious on physical examination because of marked deformity and tenderness. These fractures most commonly occur after highenergy injuries such as motor vehicle collisions and falls, and thus associated injuries are common and must be carefully searched for. If the fracture is associated with an open wound, the wound should be irrigated and covered with moist sterile dressings. Treatment of small, relatively clean wounds includes administration of a first-generation cephalosporin. An aminoglycoside should be given if more extensive soft tissue injury is present. Because associated fractures in the hip and knee are common, radiographs should be obtained. Blood loss can be significant, but associated neurovascular injuries are rare. On average, these patients lose about 2 to 3 units of blood, and about 50% will require blood transfusions. Traction devices should be removed when patients arrive at the ED, but limb immobilization should be maintained. Treatment includes internal fixation with intramedullary rods. Severely comminuted fractures may be treated by closed reduction. In general, patients do better if the fractures are stabilized within 24 hours of injury. Early stabilization is associated with early patient mobilization and therefore less risk for the development of deep vein thrombosis, pressure ulcers, and pneumonia. Fat embolism syndrome is a possible complication. This condition is manifested by signs of pulmonary or central nervous system dysfunction, fever, and rash starting about 12 to 72 hours following the injury. In almost all cases, the fractures will have healed and the patients will be functional in 6 months. Nonunion is rare. DISTAL FEMORAL FRACTURES Fractures of the distal end of the femur tend to occur in older patients with severe osteoporosis or in young people with multiple trauma. Supracondylar and intercondylar fractures of the femur are difficult to treat. They are generally unstable and often comminuted. Most are treated operatively. 728
4 CHAPTER 83 Hip and Femur Injuries However, malunion, nonunion, and infections are relatively common. STRESS FRACTURES Stress fractures occur when normal bone is subjected to repeated stress. The bone fails because osteoblasts are unable to lay down new bone fast enough. Symptoms of a femoral neck stress fracture can be very mild pain only. Consequently, the injury may be mistaken for a muscle strain or arthritis. Pain is typically felt in the groin and medial aspect of the thigh, is worse with use, and may make weight bearing very painful or impossible. Findings on physical examination are usually normal, except perhaps some pain at the extremes of hip flexion and internal rotation. Because plain films are generally unrevealing until 14 days after the injury, computed tomography or magnetic resonance imaging may be needed to make the diagnosis. This condition is often bilateral, so any pain in the other hip needs evaluation as well. HIP DISLOCATIONS In approximately 90% of hip dislocations, the femoral head is posterior to the acetabulum. Typically, posterior hip dislocations occur when the knee hits the dashboard during a motor vehicle collision. In posterior hip dislocations the limb is adducted, internally rotated, and shortened. In anterior dislocations the limb is abducted, externally rotated, and shortened. POSTERIOR HIP DISLOCATIONS Several techniques for reducing posterior hip dislocations have been described in the literature. All these methods require adequate sedation and analgesia. The Stimson method requires the patient to lie with the legs hanging over the edge of the bed. This position is seldom practical in a trauma patient, however. 4 The Allis technique involves keeping the patient supine on the bed. The hip is then flexed to 90 degrees and upward traction is applied with some gentle internal and external rotation. It is usually necessary to stand on the bed over the patient to perform this technique. An assistant stabilizes the pelvis and may apply some lateral force to the leg. The Whistler technique involves lying the patient supine on the bed with the knees flexed about 130 degrees. 9 An assistant stabilizes the pelvis while the operator stands on the side of the bed near the affected hip. The operator places an arm under the knee on the leg with the dislocation and then grips the top of the other knee. The other hand stabilizes the patient s ankle. The operator then raises up the arm by using the patient s knee as a lever in an attempt to relocate the hip. After reduction, the legs are immobilized in slight abduction with a pillow between the knees, and the patient should be sent for radiographs and hospital admission. ANTERIOR HIP DISLOCATIONS A modification of the Allis maneuver can be used to relocate anterior hip dislocations. The patient is placed supine and an assistant stabilizes the pelvis and applies lateral force to the affected thigh. Traction is then applied along the long axis of the femur with the hip slightly flexed. Gentle leg adduction and internal rotation may facilitate the reduction. Postreduction care is the same as for posterior hip dislocations. PROSTHETIC HIP DISLOCATIONS A patient with a hip arthroplasty may dislocate the hip with minimal force. Frequently, a minor twisting motion is all that it takes. As with native hips, the majority of these dislocations are posterior. The reduction methods are the same as with a native hip. Orthopedic consultation should be considered. Because aseptic necrosis is not an issue, there is no urgency to reduce the hip. Unlike patients without artificial hips, these patients will often not require hospitalization after reduction. RED FLAGS It is important to look for acetabular fractures before performing closed reduction of a hip dislocation. On average, patients with femoral shaft fractures lose about 2 to 3 units of blood at the fracture site, and about half of these patients will require blood transfusions. Hip dislocation or fracture in a young person is strong evidence of serious multisystem trauma. TIPS AND TRICKS Consider avascular necrosis in patients with nontraumatic hip, thigh, or knee pain. If hip pain prevents weight bearing and plain films do not reveal a fracture, perform computed tomography or magnetic resonance imaging to rule out a fracture. ULTRASOUND-GUIDED FEMORAL NERVE BLOCK Pain relief for hip fractures and femoral shaft fractures can be achieved with ultrasound-guided femoral nerve blocks. 10 Contraindications to this procedure include hypersensitivity to the local anesthetic and infections near the injection site. In addition, patients with neurologic deficits in the affected leg or those at risk for compartment syndrome should not have a femoral nerve block performed because it may make it difficult to detect new or worsening neurologic changes. A femoral nerve block is also relatively contraindicated in patients taking anticoagulants or with a bleeding diathesis. Because high energy is generally required to dislocate a hip, associated injuries are common. 11 Ligamentous knee injuries, acetabular and femoral fractures, and sciatic nerve palsies should be considered. If an associated fracture is not clearly seen on plain films, a computed tomography scan should be ordered. Posterior dislocations are likely to cause a fracture of the inferior aspect of the femoral head and may cause injury to the sciatic nerve. 12 Anterior dislocations are associated with fractures of the anterior femoral head and also with vascular injuries. 729
5 SECTION VIII TRAUMATIC DISORDERS PRIORITY ACTIONS Hip dislocations are true orthopedic emergencies. Reduction should be done as soon as possible. Reduction within 6 hours reduces the incidence of avascular necrosis. Significant blood loss is common with hip and femoral fractures, especially fractures in young people, which usually involve a high-energy force. Good intravenous access, fluid resuscitation, and monitoring for blood loss are mandatory. DOCUMENTATION Always carefully record the findings on neurovascular examination in patients with fracture involving an extremity. If hip reduction is delayed, record the reason for delay. Hip dislocations are orthopedic emergencies. Reduction should be performed as soon as possible because the incidence of avascular necrosis, traumatic arthritis, and joint instability increases with the length of time that the hip is dislocated. In addition, orthopedic consultation should be obtained. Hip relocations require procedural sedation in the ED or general anesthesia in the operating room. SUGGESTED READINGS Christos S, Chiampas G, Offman R, et al. Ultrasound-guided three-in-one nerve block for femur fractures. West J Emerg Med 2010;11: Fracture dislocations of the hip. In: Wheeless textbook of orthopedics (online). Available at LaVelle DG. Fractures of hip. In: Canale ST, editor. Campbell s operative orthopaedics. 10th ed. St. Louis: Mosby; pp REFERENCES References can be found on Expert 730
6 CHAPTER 83 Hip and Femur Injuries REFERENCES 1. Burge R, Dawson-Hughs B, Solomon D, et al. Incidence and economic burden of osteonecrosis-related fractures in the United States, J Bone Miner Res 2007;22: Kannus P, Parkkari J, Sievanen H, et al. Epidemiology of hip fractures. Bone 1996;18(1 Suppl):57S-63S. 3. Dreinhofer KE, Schwarzkopf SR, Haas NP, et al. Isolated traumatic dislocation of the hip: long-term results in 50 patients. J Bone Joint Surg Br 1994;76: Tornetta III P. Hip dislocations and fractures of the femoral head. In: Bucholz RW, Heckman JD, Court-Brown CM, et al, editors. Rockwood and Green s fractures in adults, vol. 2. 6th ed. Philadelphia: Lippincott Williams & Wilkins; p National Osteonecrosis Foundation. Osteonecrosis. Available at nofbrochure/nonf-brochure.htm. 6. Gurr DE, Gibbs MA. Femur and hip. In: Marks JA, Hockberger RS, Walls RM, editors. Rosen s textbook of emergency medicine: concepts and clinical practice. 5th ed. St. Louis: Mosby; p Anderson BC: Evaluation of the adult with hip pain. Available at 8. LaVelle DG. Fractures of hip. In: Canale ST, editor. Campbell s operative orthopaedics. 10th ed. St. Louis: Mosby; p Herwig-Kempers AH, Veraart BE. Reduction of posterior dislocation of the hip in the prone position. J Bone Joint Surg Br 1993;75: Christos S, Chiampas G, Offman R, et al. Ultrasound-guided three-in-one nerve block for femur fractures. West J Emerg Med 2010;11: Mirza A, Ellis T. Initial management of pelvic and femoral fractures in the multiply injured patient. Crit Care Clin 2004;20: Fracture dislocations of the hip. In: Wheeless textbook of orthopedics (online). Available at e1
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