How can an X-ray of a child’s femur be used to determine the approximate age of that child?
The Correct Answer is ["epiphyseal analysis"]
The epiphysis is the rounded end of the femur that articulates with the hip bone and knee joint.
As a child grows, the epiphysis gradually fuses with the rest of the bone through a process called ossification.
By examining the degree of fusion of the epiphysis with the femur on an X-ray, doctors can estimate the age of the child.
In general, the younger the child, the less fused the epiphysis will be, and the easier it will be to determine the child's age.
However, it's important to note that this method provides only an approximate age range and cannot be used to determine an exact age.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
The skeletal system has five main functions: support, movement, protection, mineral and fat storage, and blood cell formation.
All of the other choices are primary functions of the skeletal system.
Choice B is incorrect because storing inorganic salts is one of the functions of the skeletal system.
The bone tissue acts as a reservoir for minerals like calcium and phosphorus.
Choice C is incorrect because attachment sites for muscles is one of the functions of the skeletal system.
Bones facilitate movement by serving as points of attachment for muscles.
Choice D is incorrect because support and protection is one of the functions of the skeletal system.
Bones provide a scaffold that supports the body and protects the internal organs.
Correct Answer is ["Flexion of the hip joint"]
Explanation
Hip flexion refers to the movement of the thigh bone (femur) towards the front of the body, bringing the knee closer to the chest.
This movement is achieved by the contraction of muscles in the front of the hip, including the iliopsoas and rectus femoris muscles.
The joint involved in hip flexion is the hip joint, which is a ball-and-socket joint formed by the articulation between the head of the femur and the acetabulum of the pelvis.
This joint allows for a range of movements, including:
1. Hip extension: This refers to the movement of the thigh bone backwards, away from the front of the body, which is achieved by the contraction of muscles in the back of the hip, including the gluteus maximus and hamstrings.
2. Hip abduction: This refers to the movement of the thigh bone away from the midline of the body, towards the side, which is achieved by the contraction of muscles on the outside of the hip, including the gluteus medius and tensor fasciae latae.
3. Hip adduction: This refers to the movement of the thigh bone towards the midline of the body, which is achieved by the contraction of muscles on the inside of the hip, including the adductor muscles.
4. Hip external rotation: This refers to the movement of the thigh bone away from the midline of the body and outwards, which is achieved by the contraction of muscles on the back of the hip, including the piriformis and gemellus muscles.
5. Hip internal rotation: This refers to the movement of the thigh bone towards the midline of the body and inwards, which is achieved by the contraction of muscles on the inside of the hip, including the gluteus minimus and tensor fasciae latae.
All of these movements of the hip joint are important for walking, running, and other activities that require the use of the lower limbs.
Additionally, a lack of hip flexibility or strength can lead to compensatory movements in other parts of the body, which can result in pain or injury over time.
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