Femoral Fractures

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Original Editors - Willem Vanderpooten

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A femoral fracture is a break in the femur, this is the thigh bone. The femur is the largest en strongest bone in our body so it requires a large or high impact force to break this bone. Most femur fractures are the result of a high energy trauma, such as a motor accident, gunshot wounds and jumps and falls from a height. A femoral fracture is a very serious injury and needs 3-6 months to heal.

Femur fractures can be classified in 3 types: Femoral head fracture, femoral shaft fracture and femoral condyles fracture.

{2} Figure: Seinsheimer classification of subtrochanteric fractures (Seinsheimer 1978), modification, drawn by Juho Vuolteenaho.

Osteology:

Head, Greater and lesser trochantor, Shaft, Lateral and medial condyles with in between the patellar surface.

Musculature:

The femur is surrounded by different muscles: the quadriceps, the adductors, abductors and the hamstrings. 1. Quadriceps: M rectus femoris, M vastus lateralis, M vastus medialis, M vastus intermedius 2. Adductors: M adductor longus, M adductor brevis, M adductor longus, M pectineus, M gracilis 3. Abductors: M tensor fasciae latae 4. Hamstrings: M biceps femoris, M semimembranosus, M semitendinosus

After a femoral fracture, the most of this muscles are much weaker than before so a physiotherapy is very important.

{3} Several large muscles attach to the femur. Proximally, the gluteus medius and minimus attach to the greater trochanter, resulting in abduction of the femur with fracture. The iliopsoas attaches to the lesser trochanter, resulting in internal rotation and external rotation with fractures. The linea aspera (rough line on the posterior shaft of the femur) reinforces the strength and is an attachment for the gluteus maximus, adductor magnus, adductor brevis, vastus lateralis, vastus medialis, vastus intermedius, and short head of the biceps. Distally, the large adductor muscle mass attaches medially, resulting in an apex lateral deformity with fractures. The medial and lateral heads of the gastrocnemius attach over the posterior femoral condyles, resulting in flexion deformity in distal-third fractures.

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