Femoral Shaft Fracture

Introduction

A femoral shaft fracture is a break in the long, middle portion of the thighbone (femur)—the strongest and one of the largest bones in the body. This type of injury usually results from high-energy trauma such as car accidents, falls from significant heights, or severe sports injuries. Because of the bone’s strength, it takes a large force to break it. However, in older adults with osteoporosis, even a lower-impact fall can cause this type of fracture. Femoral shaft fractures cause immediate, severe pain and often make it impossible to stand or walk. Swelling, bruising, and visible deformity of the thigh are also common.

Diagnosing a Femoral Shaft Fracture

To diagnose a femoral shaft fracture, a doctor begins with a detailed medical history and physical examination. They will ask how the injury occurred, check the leg’s alignment, and look for signs of swelling, bruising, or deformity. Because this injury is often caused by high-energy trauma, doctors will also check for other injuries to nearby joints or organs. X-rays are typically the first imaging study performed to determine the location, type, and extent of the fracture. In complex cases, especially when the fracture extends into the hip or knee, a CT scan may be ordered for a more detailed view. Occasionally, MRI scans are used to detect smaller cracks or stress fractures that are not easily visible on X-rays.

Types of Femoral Shaft Fractures

Femoral fractures can vary in pattern and severity and include:

• Undisplaced fractures: The bone cracks but remains in normal alignment.
• Displaced fractures: The bone ends move out of position.
• Transverse fractures: The break runs straight across the bone.
• Oblique fractures: The break occurs at an angle.
• Spiral fractures: The fracture line spirals around the bone, often caused by twisting forces.
• Comminuted fractures: The bone breaks into three or more pieces, often due to high-energy impact.
• Stress fractures: Tiny cracks caused by repetitive stress or overuse, often seen in athletes.
• Open fractures: The bone pierces through the skin, creating a high risk of infection and soft tissue injury.

Non-Surgical Treatment

Non-surgical (conservative) treatment is rarely used for adult femoral shaft fractures because the femur typically displaces due to strong surrounding muscles. However, in select cases—such as small, stable, or stress fractures—a cast or traction may be used. In young children, traction followed by casting can allow the bone to heal properly because their bones remodel as they grow. For most adults, though, surgical fixation is necessary to ensure proper alignment and healing.

Surgical Treatment of Femoral Shaft Fractures

Surgery is the standard treatment for most femoral shaft fractures. The most common procedure is intramedullary nailing (Figure 1), in which a metal rod is inserted down the center of the femur to stabilize the bone. This rod is secured with screws at both ends. For fractures near the hip or knee, plates and screws may be used to hold the bone fragments together. In cases of severe soft tissue damage or open fractures, an external fixator (metal frame outside the leg) may temporarily stabilize the bone until the patient is ready for more definitive surgery. Surgical repair allows early movement and reduces the risk of complications related to prolonged immobilization.

Femoral Shaft Fracture Recovery and Rehabilitation

Healing of a femoral shaft fracture can take several months -and full recovery can take 18-24 months. Most patients can begin gentle movement of the hip and knee within days of surgery to prevent stiffness. Physical therapy plays a critical role in restoring strength, flexibility, and walking ability. Weight-bearing usually begins gradually, guided by the surgeon and therapist. A coordinated rehabilitation plan, including regular exercises and follow-up appointments, is essential for regaining full function and preventing long-term weakness or stiffness.

Long-Term Prognosis

The long-term outlook for femoral shaft fractures is generally good with proper treatment. Most patients recover normal leg function, although the bone healing process can take 4 to 6 months or longer. Potential complications include delayed healing or nonunion, infection, malalignment, and limb-length differences if the bone heals unevenly. Blood clots and stiffness in nearby joints can also occur, emphasizing the importance of early movement and rehabilitation. With proper care, most patients return to their usual activities, work, or sports after full healing.

Edited by Stephen Pinney MD, November 15th 2025.