Chapter 2 Skeletal System Flashcards
What is anchondroplasia?
It is the failure of the cartilage that becomes bone to form properly, thus not allowing ossification to proceed as it should
What is anchondroplasia caused by?
An abnormal gene located on one of the chromosomes
What is the most common cause of disproportionate short stature?
Anchondroplasia
What do individuals affected with anchondroplasia display?
They have short extremities while the trunk and skull are of normal size. Often the arms are shorter than the lower extremities. There is lordosis of the lumbar spine, bowed legs, and a bulky forehead with a saddle shaped nose
What happens to the technique with anchondroplasia?
Because the cartilage is not ossified as it should, radiographs taken of infants will not require the higher kVp
What is ankylosing spondylitis?
A chronic inflammatory disorder that predominantly affects the sacral iliac joints and lumbar spine
What is another name for ankylosing spondylitis?
Rheumatoid spondylitis
Who is more affected by ankylosing spondylitis
Males between 15 and 35 years with an average age of 26
Where does ankylosing spondylitis start?
It stars in the lumbar spine and progresses upward causing kyphosis and difficulty breathing as it reaches the thoracic area
What does ankylosing spondylitis cause?
Extensive calcifications of the anterior longitudinal ligament
What is bursitis?
It is an inflammation of the synovial bursa caused by excess stress on the joint. It is the most common non arthritic ailment of joints
Where is bursitis generally found?
In the shoulder, and radiographs may show calcified deposits in the tendon above the greater tuberosity of the humerus
What is spondylolisthesis?
The forward displacement of the vertebrae on top of another, usually occurring at the L5/S1 junction
Where can spondylolisthesis occur?
Usually L5/S1 junction but will occur anywhere that a vertebral body will slide forward over the vertebrae below it
What is the less common type of spondylolisthesis?
Seen between L4 and L5
What is spondylolithesis usually caused by?
Some kind of defect of the pedicle
What is spondylolysis?
A condition of the spine characterized by fixation and stiffness
What is spina bifida?
The failure of fusion of one or more vertebral arches
What are the different types of spina bifida?
Spina bifida occulta, and spina bifida aperta
What is spina bifida occulta?
It occurs when the two halves of the posterior arch fail to unite
Where does spina bifida occulta most often occur?
The first sacral vertebra
With SBO, there is no protrusion of what?
The spinal cord or its membrane, however if neural elements project through the defect without any meninge covering a myelocele is present
What is a meningocele?
A cerebrospinal fluid filled sac covered with the meninges of the cord
What is spina bifida aperta?
There is a wide bony defect in the posterior arch of the lumbar vertebrae
What does spina bifida aperta leave room for?
A protrusion of the spinal cord contents beyond the spinal canal
What is a myelomeningocele?
A sac containing CSF and some of the neural elements of the cord protruding
What will plain radiographs show with spina bifida?
The absence of the lamina and spinous processes, along with the widening of the space between the thinning pedicles
What is scoliosis?
The lateral deviation and rotation of the spine
What are the different types of scoliosis?
Idiopathic, congenital, or acquired
What is congenital scoliosis commonly the result of?
Vertebral abnormalities such as hemivertebrae, wedge vertebrae, or neuromuscular development
What other anomalies are associated with congenital scoliosis?
Urinary anomalies
What is wedge vertebrae or hemi vertebrae?
Failure of formation of the vertebrae
What is Congenital dislocated hip?
It occurs when the capsule of the hip joint relaxes and allows dislocation of the hip
What is another name for congenital dislocated hip?
Developmental dysplasia of the hip
Who is more often affected by CDH?
Caucasian females
What are predisposing factors of CDH?
Breech deliveries and oligohydraminos
What complications may occur if CDH has not been diagnosed and treatment is not put into place?
Avascular necrosis, pseudoacetabulae may develop from pressure of a displaced femoral head in the iliac wing,and secondary arthritis
What is a bone cyst?
A wall of fibrous tissue filled with clear fluid, occurring in the proximal humerus and knee of adolescents and young adults
Who is most often affected by bone cysts?
Males
Where does a bone cyst develop?
Beneath the epiphyseal plate but migrates down the shaft with growth
True or False
Bone cysts are not usually noted on a radiograph but are detected only when pain due to cyst growth or a pathologic fracture occurs
True
When bone cysts do appear on radiographs, what do they show?
A lucent focus with a thin cortex and sharp boundary. There may be septae to cause a loculated appearance
What do CT scans show with bone cysts?
A fluid density within a well-defined lesion with bony spetations within it. This will help differentiate it from fibrous dysplasia
Where are disk herniations common?
The lumbar spine area
What are disk herniations?
The fibrous ring of the disk degenerates to the point that the pulpy nucleus is forced out of the disk
What do posterior herniations result in?
Pressure on the spinal cord and nerve roots which can cause neurologic symptoms
What do radiographs show with disk herniations?
narrowing of the disk
What is the most common types of arthritis?
Osteoarthritis and occurs in patients who have put a lot of “wear and tear” in the large weight-bearing joints such as the knee
What is another name for osteoarthritis?
Degenerative joint disease
What is osteoarthritis?
A noninflammatory deterioration of the articular cartilage with new bone forming at the surface of the joint
What may occur with osteoarthritis?
Narrowing joint spaces and some erosion
What happens when the smaller joints are affected with osteoarthritis?
They will show nodules and increased size at the interphalangeal joint spaces
What is rheumatoid arthritis?
It is an autoimmune disease characterized by chronic and progressive inflammatory involvement of the joints and atrophy of the muscles
What does rheumatoid arthritis affect?
The small joints of the hands and feet
Who is more often affected by rheumatoid arthritis?
Women in their 30s and 40s
What is the cause of RA?
The cause is unknown
Where does widespread inflammation occur with RA?
In the synovial membrane causing pain, stiffness, and thickening of the tissue. This thickened tissue grows inward and damages the cartilage. Later, the tissue becomes fibrous, which prevents motion of the joint (fibrous ankylosis). As the disease progresses, the fibrous tissue becomes calcified and becomes osseous tissue (bony ankylosis)
What do radiographs show in the early stages of RA?
Soft-tissue swelling around the joints
What do radiographs show in the later stages of RA?
A decrease in the joint space, with eroded bone ends and subluxation which leads to the gross deformities
What happens to the wrist with RA?
Ulnar deviation of the wrist with either boutonniere deformity (flexion) or swan neck deformity (hyperextension) of the proximal interphalangeal joint
What is osteogenic sarcoma?
A highly malignant primary tumor occurring at 10 to 30 years of age with the peak incidence rate at 20 years of age
Where does osteogenic sarcoma most often occur?
In the long bones, particularly at the lower ends of the femurs and upper ends of the humerus or radius
What is lifted from the bone with osteogenic sarcoma?
The periosteum
What is another term used for osteogenic sarcoma?
Osteosarcoma
What radiate outward from the central mass with osteogenic sarcoma?
Spicules of new bone
How is osteogenic sarcoma often found?
It is usually found as an incidental finding while investigation recent trauma to the bone. Known as traumatic determinism
What is multiple myeloma?
It is the most common primary tumor of the bone
What bones does multiple myeloma most often affect?
The flat bones
Who is most often affected by multiple myeloma?
Persons over the age of 50 years
Where does multiple myeloma often arise from?
The bone marrow plasma cells and occurs in bone marrow that is actively hemopoietic. Therefore, it is not a true osseous tumor