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Skeletal System

Skeletal System. 2 Axial Skeleton 80 bones 3 Appendicular Skeleton 126 bones

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Text of Skeletal System. 2 Axial Skeleton 80 bones 3 Appendicular Skeleton 126 bones

  • Skeletal System

  • *Axial Skeleton80 bones

  • *Appendicular Skeleton126 bones

  • *Bony composition

  • *Endochondral OssificationDiaphysis: refers to the shaft portion of the long bones. Primary site of ossification.

    Epiphysis: expanded end portion and its the secondary site of ossification.

    Metaphysis: growth zone between the epiphysis and diaphysis.

  • Congenital and Hereditary Diseases

  • *Osteogenesis ImperfectaOften called brittle bone disease

    Hereditary or congenitalSerious disease

    Bone cortex is thin and porous, and trabeculae are thin, delicate and widely separated

    X-ray demonstrates various fractures in various stages of healing and general decrease in bone mass

  • *Osteogeneis Imperfecta

  • *AchondroplasiaMost common inherited disorder of the skeletal systemResults in bone deformity & dwarfismNormal trunk size & shortened extremitiesUsually no more than 4ft tallClinical manifestation:Lumbar lordosis, bowed legs, bulky forehead with hypoplasianarrowing of foramen magnum causing neural compression

  • *Achondroplasia

  • *OsteopetrosisBones are abnormally heavy and compact but brittleAll bones are affected by most changes occur in long bones of extremities, vertebrae, pelvis and base of skullX-rays demonstrate increase in thickness and density of bony cortex.Increase in the # and size of trabeculae, reduction of the marrow space

  • *Osteopetrosis

  • *ScoliosisLateral curvature of the spine

    Does not usually become visible until adolescents

    Affects girl more

  • *Scoliosis

  • *Rotoscoliosis

  • *Transitional VertebraOften called Lumbar RibsTakes on characteristics of both vertebrae on each side of a major division of the spine

    1st lumbar may have a rib

    At C7 there may be a cervical rib

  • *Cervical Ribs & Lumbar Ribs

  • *AnencephalyCongenital abnormality Brain and cranial vault do not formResults in death shortly after birthCan be diagnosed with US before they are born

  • *Anencephaly

  • Inflammatory Diseases

  • *Rheumatoid ArthritisChronic autoimmune that may fluctuate in severity

    Overgrowth of the synovial tissues

    X-ray shows soft tissue swelling & osteoporosis of affected bone. Bone erosion & decalcification

  • *Rheumatoid Arthritis

  • *OsteoarthritisMost common form of arthritis

    Articular cartilage degenerates & gradually is worn away exposing underlying bone

    Ostephytes & bone spurs are on x-rays

  • *Osteoarthritis

  • *OsteomyelitisInfection of the bone & bone marrow

    Symptoms & signs include fever, heat in the affected area, & dull pain

    X-rays demonstrate loss of bone calcium and soft tissue swelling

  • *Osteomyelitis

  • *Ankylosing SpondylitisProgressive form of arthritis affecting the spine

    X-ray shows bilateral narrowing & fuzziness of the SI jointsCalcification of the bones of the spine with ossification of the vertebral ligaments

  • *Ankylosing Spondylitis

  • *GoutIs an inherited metabolic disorder in which excessive amounts of uric acid is produced & deposited in the joint and adjacent bone

    Bone changes include erosion & overhanging edges

  • *Gout

  • *SpondylolisthesisSlipping of the body of the vertebra

    Symptoms are similar to those of a herniated disk

  • *Spondylolisthesis

  • *OsteochondromaBenign bone tumor

    Affects women more than menAsymptomatic

    Excessive bone growth

    Cortex of osteochondroma blends in with normal bone and growth protrudes up & away from nearest joint

  • *Osteochondroma

  • *OsteosarcomaMost common primary malignancy of the skeleton

    Highly aggressive and most often occurs in the bone marrow

    X-ray appears as a sunray or sunburst

  • *Osteosarcoma

  • *Bone CystIdiopathitic disease and is not a true neoplasm

    Consists of numerous blood filled arterivenous communications

    Most common treatment is surgical removal

  • *Bone Cyst

  • *MRISuperior contrast resolution for soft tissue detailModality of choice for soft tissue tumorExtremely useful in eval of joints

    MRi detects a larger number of musculoskeletal subtleties with higher resolution imaging

    Bone marrow imaging is better than nuc med scans for subtle abnormalities

  • *CTCan be performed quickly & noninvasively

    Defines extent of fractures and dislocations

    Superior to MRI for cortical bone and visualization of bony detail

    Gives better bone detail than plain x-ray

    Has been largely replaced by MRI for soft tissue

  • *Nuclear MedicineHas advantage over CT & MRI because it can scan the whole body at one time

    Can show if an injury is old or new

    Still the standard for examination of metastatic processes because it demonstrates metabolic reaction of bone to the disease processIs more sensitive than comparative radiographic studies

    Compact bone: outer portion

    Medullary canal- inner portion made of cancellous bone. Bone marrow is located within medullary canal ad it is interspaced with trabeculae.

    Trabeculae: web like bony structure. Can be seen on a properly exposed radiograph.

    Diploe: cancellous bone located within the skull.

    Red bone marrow: found in normal adult bones of the trunk. At 20 years of age the majority is replaced by yellow bone marrow which is primarily fat.

    Osteoblasts: bone forming cells that line the medullary canal and are interspaced throughout the peristeum. Responsible for bone growth and thickening, ossification and regeneration.

    Osteoclasts: break down bone to enlarge the medullary canal and allow for bone growth.

    *Diaphysis: refers to the shaft portion of the long bones. Primary site of ossification.

    Epiphysis: expanded end portion and its the secondary site of ossification.

    Metaphysis: growth zone between the epiphysis and diaphysis.

    There is a growth plate between the metaphysis and epiphysis made of cartilage. Appears radiolucent until child grows and it calcifies.

    Peristoeum: fibrous membrane that encloses all the bone except the joint surfaces.

    The more physical stress the bone is under the more thickly the compact bone becomes.

    *Deficient formation of osseous tissue, skin , slcera, inner ear and teeth.

    2 Main groups:1) Congenita- present at birth and there are multiple fractures at birth. Limb deformities and dwarfism that may lead to death.

    2) Tarda- fractures may not appear until some years after birth and then generally stop once adulthood is reached. They often have hearing disorder that persists called otoslcerosis. Otosclerosis is abnormal connective tissue around auditory ossicles.*Most common inherited skeletal disorder.

    Results in bone deformity and dwarfism. Does not skip generations and 50% of passing it to children.

    Cartilage on epiphysis of the long bones does not convert to bone; impairs longitudinal growth of the bones.

    Normal trunk size and shortened extremities. Usually no taller than 4 ft.

    Other symptoms include extreme l-spine lordosis, bowed legs, bulky forehead, and narrowing of the foramen magnum.

    *Increase in bone density and defective bone contour.

    Bones are heavy and compact but brittle.

    All bone are affected but primarily the bones of the extremities, vertebrae, pelvis and base of the skull.

    Radiographs show increase density and thickness of bony cortex as well as an increase in the number and size of trabeculae with reduction of bone marrow space. *Lateral curvature of the spine. Convex to the RT on the t-spine and convex to the LT on the l-spine.

    80% are idiopathic

    Can generate complications such as cardiopulmonary complications, degenerative spinal arthritis, fatigue, joint dysfunction syndromes.

    Non-structural scoliosis-results from uneven leg length or postural changes due to chronic pain elsewhere in the body.*AT C7 it can exert pressure on brachial nerve plexus or subclavian artery requiring removal. *7 criteria for diagnosis of RAMorning stiffness in and around the jointsSimultaneous soft tissue swelling or fluid of at least 3 joint areas lasting for at least 6 weeks and observed by and MDArthritis hand joints-at least one area swollen in a PIP, MCP or wrist joint for at least 6 weeks.Rheumatoid nodules or lumps of tissueAbnormal amounts of serum RFSymmetric arthritic- simultaneous involvement of the same joint areas on both sides of the body for at least weeks. Radiographic changes demonstrating bone erosion and decalcification

    *Occurs in 30-40 years and affects women 3xs more than men.

    As the disease progresses cortical erosion with joint space narrowing occurs b because of overgrowth of synovial tissue in the articualr spaces. This damage makes joint unstable and leads to deformity caused by displacement of bones.

    Can result in subluxation and dislocation eventually leads to fusing. Sometimes surgical intervention is needed to correct these pathologies.synovium excisiondislocation correctionjoint reconstructionjoint replacements

    *Affects men/women equally. Asymptomatic until 50s.

    Generally affects the LG weight bearing joints such as the hip and knee

    Loss of cartilage appears as joint narrowing. Overgrowth of cartilage occurs in the peripheral surfaces of the joint and calcifies- bone spurs. The bone spurs or osteophytes are what distinguish one arthritis from the other.

    NSAIDS and exercise are the best treatment.

    *Pathogenic microorganisms spread via the bloodstream. (hematogenous)

    Contiguous infetions- burns, sinus disease, peridontal infection, soft tissue infection and peripheral vascular disease.

    NUC med and MRI are better for imaging this pathology.

    *Progressive type of arthritis mainly affecting the spine. Usually affects men 20-40 years old.

    Symptoms: low back pain at night, morning stiffness, weight loss, low grade fever, fatigue and anemia.

    Early radiographic signs include narrowing and fuzziness of SI joints. Eventually there are no SI joints and disease progresses up the spine.

    Disk space calcifies and bone of the spine fuses.

    Treated with NSAIDS, exercise and postural training.

    *Inherited metabolic disorder in which uric acid is deposited into the joint and adjacent bone. Occurs more frequently in men and most commonly in the metatarsalphalangeal joints of the great toe.

    The crystallization causes an inflammatory action.

    Treatment includes medications to promote excretion of uric acid or to inhibit the production of uric acid.

    *Refers to the anterior slipping of the body of the vertebra.

    Symptoms are similar to those of a slipped disk. 90% occur at L5-S1, best detected on a lateral projection.

    *Most common benign bone tumor

    Affects men 3xs more than women. Arises in the metaphysis. Most commonly involves lower femur and upper tibia.

    Cortex blends with normal bone, growth protrudes upward and away form the nearest joint and most commonly in the knee.

    Many times it is asymptomatic until trauma occurs.*Most frequently found in the metahysis of the long bones and 50% affect knees.

    75% of patients are under 20 years

    Most commonly in bone marrow and it is highly aggressive.

    *Generally occurs in the metaphysis of long bones in patients under 20 years. Slow growing.

    Symptoms include pain and swelling at the site of cyst.

    Cystic growth causes thinning of the bony cortex that is apparent radiographically. It is a well-circumscribed lesion associated with soft tissue extension and peristeal bulging. *