bone growth & development bpk 375. bone growth & development when do the first bones ossify?...
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Bone Growth & Development
BPK 375
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Bone Growth & Development
When do the first bones ossify? Which is the first bone to ossify? Does exercise affect bone growth &
development?
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10 weeks gestation
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16 weeks gestation
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Osteocyte– Mature bone cell that turns over bone mineral and
assists in repairs Osteoblast
– Immature bone cell that secretes organic components of matrix
Osteoprogenitor Cell– Stem cells whose divisions produce osteoblasts
Osteoclast– Multinucleated cell that secretes acids and enzymes
to dissolve bone matrix
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Intramembranous OssificationOssification of Mesenchymal Connective Tissue
Osteoblast
Osteoclast
Osteocyte
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Growth of Skull
Fontanelles Suture Joints Proportions
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Growth of Vault of Skull
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Jaw Growth
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Acromegaly
Oversecretion of growth hormone
Prior to growth plate fusion, causes increased height with normal proportions
After fusion, causes bone thickening and connective tissue overgrowth
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Endochondral Bone Growth
Short bones e.g. carpals
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Articular Cartilage
Periosteum
Haversian System
Compact Bone
Yellow Bone Marrow
Spongy (Cancellous)Bone
Compact Bone
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Haversian System
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Chondrocytes at the center of the cartilage model begin to hypertrophy and disintegrate as the matrix calcifies
Endochondral Ossification
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Blood vessels grow around the edges of the cartilage, and the perichondrial cells convert to osteoblasts. The shaft of the cartilage then becomes ensheathed in a layer of bone
Endochondral Ossification
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Blood vessels penetrate the cartilage and invade the central region, growing toward the epiphyses at either end.
Fibroblasts migrating with the vessels differentiate into osteoblasts and begin producing spongy bone
Endochondral Ossification
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Endochondral Ossification
Remodelling occurs as growth continues, creating a marrow cavity.
The bone of the shaft becomes thicker, and the cartilage near each epiphysis is replaced by shafts of bone.
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Cartilaginous Growth Plate
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Metaphyseal Reshaping
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HAND Primary Centres
FOOT Secondary CentresFOOT Primary Centres
HAND Secondary Centres
Fuse
Fuse
f.m. = fetal month, m = postnatal month, y = year
Time of Appearance of Primary & Secondary Ossification Centres
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Hand most commonly used in studies of child development
Fairly representative of the total maturational status of the skeleton
Greater number of ossification centres than any other area in the arms and legs
Hand is an easy area to X-ray
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Skeletal AgeGreulich and Pyle
– radiographic Atlas of Skeletal Development of the hand and wrist
– American children– Reliability: 95% ±0.8 – ±1.0 yrs on repeat
ratingsTanner & Whitehouse
– Bone Specific Ratings– English children– Reliability: 95% ±0.6 yrs on repeat ratings
American boys matured about 6 months earlier than English children
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Longitudinal series of X-rays on a girl
X-ray shows bone not cartilage
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TW2Tanner-Whitehouse
Bone specific ratings
Fulfill written criteria
Assign score for chosen stage
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Bone Maturity Charts
Growth Hormone and Gonadotrophin Deficiency
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Turner Syndrome
Bone Maturity Charts
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Hippocrates
“That which is used develops and that which is not used wastes away”
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Lines of Stress in a metal form loaded at its “head”
Lines of spicules of bone seen in head of the femur
Bone Development in response to Mechanical Forces
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Exercise & Bone Growth
HOWELL(1917) DogsRetardation in diameter growth in
later lifeLength & Basic Configuration
genetically determinedWidth influenced by exercise
Some evidence for Longer more Slender bones in sedentary animals (Steinhaus;1933)
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Exercise & Bone Growth
KATO & ISHIKO (1966)– Children– Femur and epihyseal plates showed early closure
by several years in heavy workers.– Poor environment
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Exercise and Bone Size
BUSKIRK (1956)– Nationally ranked tennis players. – Dominant hands & forearms had longer bones.
IVANITSKY - Soccer players– Femur larger in diameter than nonathlete– Marrow cavity of tibia in runners active over five
years is often enlarged
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Demineralization
Bed rest causes a loss in bone mass. Astronauts had decreased bone
mineralization after Gemini V and VI flights. Exercises were arranged on Gemini VII and
deminerallization was reduced.
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Bone Density
DONALDSON (1970)– 30 week bed rest– Increased Calcium & Nitrogen in urine– Decrease 4.2% in total body calcium– Decreased bone mineralization– 2hr/day quiet standing prevented the loss
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Bone Density
ISSEKUTZ (1966)– 3 hr quiet standing reduced calcium loss– 4 hr supine exercise did not
WYSE & PATTEE (1954)– Human paraplegics did not benefit from weight
bearing using a tilt table
EXERCISE causes increased bone density
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Dynamic Changes
Woman with no teeth How do braces work? Why do teeth tend to return to their
original position after braces are removed?
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Genetic or Environmental
Boy born without a tibia Fibula surgically moved over One year later fibula had taken
on the appearance of a tibia
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Genetic or Environmental
3 year old impaled by nail, causing paralysis of one leg
At time of injury normal hip development
One year later drastic changes