NU551 Final Exam Study Guide: Key Concepts in Anatomy and Physiology

NU551 Final Exam Study Guide: Key Concepts in Anatomy and Physiology

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Purdue University Global

NU551 Advanced Physiology and Pathophysiology Across the Lifespan

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NU551 Final Exam Study Guide:

The musculoskeletal system provides structural support, protects internal organs, enables body movement, stores minerals such as calcium and phosphorus, and supports blood cell production through bone marrow. For NU551 exams, understanding bone structure, connective tissues, fracture healing, common musculoskeletal diseases, and pediatric orthopedic disorders is essential. The key concept is that bone health depends on a continuous balance between bone formation by osteoblasts, bone breakdown by osteoclasts, and maintenance by osteocytes. When this balance is disrupted, conditions such as osteoporosis, osteomalacia, osteomyelitis, and skeletal deformities can occur.

The musculoskeletal system consists of bones, joints, cartilage, ligaments, tendons, muscles, and connective tissues that work together to provide stability and movement. Nurses must understand normal anatomy and physiology because many clinical conditions involve changes in bone remodeling, inflammation, injury, infection, or developmental abnormalities.

Connective Tissue Components and Functions

Connective tissue is a specialized tissue that supports, connects, and protects different structures throughout the body. It provides structural strength while allowing flexibility and movement. The primary components of connective tissue include cells, protein fibers, and extracellular matrix.

The extracellular matrix determines the physical properties of connective tissue. It contains collagen fibers, elastic fibers, and ground substance, which together provide strength, flexibility, and support.

What Is Collagen?

Collagen is the most abundant structural protein in the human body and is essential for maintaining the strength and integrity of connective tissues. It provides tensile strength, meaning it allows tissues to resist stretching and pulling forces.

Collagen is found in:

• Bones

• Tendons

• Ligaments

• Cartilage

• Skin

• Blood vessels

In bone tissue, Type I collagen creates the organic framework where minerals such as calcium phosphate are deposited, giving bones both flexibility and strength.

Major Types of Collagen

Citation-friendly snippet:
Type I collagen is the primary collagen found in bone and provides the flexible protein framework necessary for mineral deposition and skeletal strength.

What Is Ground Substance?

Ground substance is the gel-like component of the extracellular matrix that surrounds cells and connective tissue fibers. It allows nutrients, oxygen, and waste products to move between blood vessels and tissues.

The main components of ground substance include:

• Water

• Proteoglycans

• Glycosaminoglycans (GAGs)

• Adhesive proteins

Ground substance contributes to tissue hydration, shock absorption, and structural stability.

Bone Cells and Bone Remodeling

Bone is a dynamic living tissue that continuously undergoes remodeling. Bone remodeling replaces old or damaged bone with new tissue and helps maintain calcium balance in the bloodstream.

Three primary bone cells regulate this process:

• Osteoblasts

• Osteoclasts

• Osteocytes

Osteoblasts: Bone-Forming Cells

Osteoblasts are specialized cells responsible for building new bone tissue. They produce osteoid, which is the organic framework of bone before mineralization occurs.

Functions of osteoblasts include:

• Producing Type I collagen

• Creating osteoid

• Initiating bone mineralization

• Supporting bone growth and repair

When osteoblast activity increases, new bone formation occurs.

Osteoclasts: Bone-Resorbing Cells

Osteoclasts are large cells responsible for breaking down old or damaged bone tissue through a process called bone resorption.

Their functions include:

• Removing old bone tissue

• Releasing calcium and phosphorus into circulation

• Helping reshape bones during growth and repair

Excessive osteoclast activity can contribute to decreased bone density, as seen in osteoporosis.

Osteocytes: Mature Bone Maintenance Cells

Osteocytes are mature bone cells that develop from osteoblasts after becoming embedded within bone tissue.

They are located inside small spaces called lacunae and help:

• Maintain bone structure

• Detect mechanical stress

• Regulate bone remodeling

• Communicate with other bone cells

Osteoblasts build bone, osteoclasts break down bone, and osteocytes maintain mature bone tissue and coordinate remodeling.

Osteoid and Bone Matrix

What Is Osteoid?

Osteoid is the newly produced, unmineralized organic matrix secreted by osteoblasts. It primarily contains collagen fibers and proteins that provide the foundation for future mineral deposition.

After osteoid formation, calcium phosphate crystals are deposited, creating hardened mineralized bone.

Bone Composition: Organic and Inorganic Components

Bone strength depends on the combination of flexible organic materials and rigid inorganic minerals.

Organic Components of Bone

The organic portion provides flexibility and resistance to tension.

Major organic components include:

• Type I collagen fibers

• Osteoid proteins

• Osteocalcin

• Proteoglycans

Collagen allows bones to absorb stress without becoming brittle.

Inorganic Components of Bone

The inorganic portion provides hardness and resistance to compression.

Major minerals include:

• Hydroxyapatite crystals

• Calcium phosphate

• Calcium carbonate

• Magnesium

Hydroxyapatite is the primary mineral component responsible for bone rigidity.

What Is Osteocalcin?

Osteocalcin is a protein produced by osteoblasts that contributes to bone mineralization and calcium regulation.

Its functions include:

• Supporting mineral deposition

• Regulating calcium balance

• Acting as a marker of bone formation

Compact Bone and Spongy Bone

Human bones contain two major types of osseous tissue: compact bone and spongy bone.

Compact Bone

Compact bone is the dense outer layer of bone that provides strength and protection.

Characteristics include:

• High density

• Organized structure

• Resistance to mechanical stress

• Presence of osteons

Compact bone is primarily located in the shafts of long bones.

Spongy Bone

Spongy bone, also called cancellous bone, is a lightweight porous tissue found inside bones.

Functions include:

• Reducing skeletal weight

• Providing structural support

• Housing red bone marrow for blood cell production

Compact Bone vs. Spongy Bone

Compact bone provides mechanical strength, while spongy bone reduces skeletal weight and contains bone marrow responsible for blood cell formation.

Bone Anatomy and Skeletal Organization

The adult human skeleton contains approximately 206 bones divided into two major regions: the axial skeleton and the appendicular skeleton.

Axial Skeleton

The axial skeleton forms the central framework of the body and provides protection for vital organs.

It includes:

• Skull

• Vertebral column

• Ribs

• Sternum

Primary functions include:

• Protecting the brain and spinal cord

• Supporting posture

• Providing attachment sites for muscles

Appendicular Skeleton

The appendicular skeleton is responsible for movement and locomotion.

It includes:

• Upper extremities

• Lower extremities

• Shoulder girdle

• Pelvic girdle

The appendicular skeleton allows activities such as walking, grasping, and lifting.

Long Bone Anatomy

Long bones contain three major anatomical regions that support growth and movement.

Epiphyseal Growth Plate

The epiphyseal plate, also called the growth plate, is responsible for increasing bone length during childhood and adolescence.

As individuals reach skeletal maturity, the growth plate closes and becomes the epiphyseal line.

Longitudinal bone growth occurs at the epiphyseal growth plate, where new cartilage is produced and gradually replaced by bone tissue.

Bone Microanatomy and Internal Structure

Bone tissue contains specialized microscopic structures that provide strength, support, and nutrient delivery. The organization of compact bone allows it to withstand mechanical stress while maintaining the ability to repair itself.

Osteons (Haversian Systems)

The osteon, also called the Haversian system, is the functional structural unit of compact bone. Each osteon contains a central canal surrounded by layers of mineralized bone tissue.

The main components of an osteon include:

• Central (Haversian) canal: Contains blood vessels, lymphatic vessels, and nerves that supply bone cells.

• Concentric lamellae: Circular layers of bone matrix that provide structural strength.

• Lacunae: Small spaces that contain osteocytes.

• Canaliculi: Tiny channels that allow communication and nutrient exchange between osteocytes.

The osteon is the functional unit of compact bone and contains Haversian canals, lamellae, lacunae, and canaliculi that support bone strength and cellular communication.

Volkmann’s Canals

Volkmann’s canals are small transverse channels that connect neighboring osteons. They allow blood vessels and nerves to travel horizontally through compact bone and connect with the central canals.

Their functions include:

• Providing additional blood supply to bone tissue

• Connecting osteons together

• Supporting communication between bone structures

Lamellae and Lacunae

Lamellae are layers of mineralized bone matrix arranged around the central canal. Their circular arrangement increases bone strength and resistance to stress.

Lacunae are small cavities within the bone matrix where osteocytes are located. Through canaliculi, osteocytes exchange nutrients and communicate with neighboring cells.

Bone Growth and Development

Bone development occurs through a process called ossification, in which cartilage or connective tissue is gradually replaced by bone. Most long bones develop through endochondral ossification, where a cartilage model is converted into mature bone tissue.

Endochondral Ossification

Endochondral ossification is the primary process responsible for the formation of long bones.

The process involves:

• Formation of a cartilage template

• Development of a bone collar around the cartilage

• Replacement of cartilage with bone tissue

• Formation of mature bone structures

This process allows bones to increase in length during childhood and adolescence.

Important Structures Involved in Bone Development

Cartilage Anlage

The cartilage anlage is the original cartilage model that serves as the foundation for developing bones.

It provides the framework that is gradually replaced by mineralized bone.

Periosteal Collar

The periosteal collar is a thin layer of bone formed around the developing cartilage shaft.

Its role is to:

• Provide early structural support

• Promote development of the bone shaft

• Assist in the ossification process

Epiphyseal Growth Plate

The epiphyseal growth plate is the region where longitudinal bone growth occurs.

It contains rapidly dividing cartilage cells that allow bones to lengthen until skeletal maturity.

Joint Classification and Structure

Joints, also called articulations, are areas where two or more bones meet. They provide stability while allowing varying degrees of movement.

Joints are classified according to the type of tissue connecting the bones.

The major categories include:

• Fibrous joints

• Cartilaginous joints

• Synovial joints

Syndesmosis Joints

A syndesmosis is a type of fibrous joint where bones are connected by ligaments or an interosseous membrane.

These joints allow limited movement while maintaining stability.

An example includes:

• Distal tibiofibular joint

The strong connective tissue between bones provides support while allowing slight flexibility.

Synchondrosis Joints

A synchondrosis is a cartilaginous joint connected by hyaline cartilage.

These joints usually allow little or no movement.

Examples include:

• Epiphyseal growth plates

• First sternocostal joint

The epiphyseal plate is especially important during childhood because it allows bone lengthening.

A synchondrosis is a cartilaginous joint where bones are connected by hyaline cartilage, with the epiphyseal growth plate serving as a key example during skeletal development.

Bone Fractures and Healing Process

A fracture occurs when a bone experiences a force greater than it can withstand, causing a break or disruption in bone continuity.

Fractures vary based on the direction of the break, severity, and whether the skin is involved.

Common Types of Bone Fractures

Transverse Fracture

A transverse fracture occurs when the break is perpendicular to the long axis of the bone.

It commonly results from direct force or trauma.

Oblique Fracture

An oblique fracture occurs at an angle across the bone.

It is often caused by forces that combine bending and compression.

Spiral Fracture

A spiral fracture results from twisting or rotational forces applied to the bone.

These injuries may occur during sports or accidents.

Comminuted Fracture

A comminuted fracture occurs when the bone breaks into multiple fragments.

It is commonly associated with high-energy trauma.

Greenstick Fracture

A greenstick fracture is an incomplete fracture where one side of the bone breaks while the other side bends.

It is more common in children because pediatric bones are softer and more flexible than adult bones.

Greenstick fractures are common in children because their bones contain greater flexibility and can bend before completely breaking.

Stages of Bone Healing

Bone healing occurs through four organized stages. Successful repair requires adequate blood supply, proper alignment, and appropriate stabilization.

Stage 1: Hematoma Formation

Immediately after a fracture, damaged blood vessels release blood into surrounding tissues, creating a hematoma.

This stage initiates the inflammatory response and provides the foundation for repair.

Key events include:

• Blood clot formation

• Inflammatory cell activation

• Removal of damaged tissue

Stage 2: Fibrocartilaginous Callus Formation

During this stage, fibroblasts and chondroblasts produce collagen and cartilage that stabilize the fracture site.

The soft callus acts as a temporary bridge between broken bone fragments.

Stage 3: Bony Callus Formation

Osteoblasts replace the soft cartilage callus with woven bone.

This creates a stronger but immature bone structure.

Stage 4: Bone Remodeling

During remodeling, woven bone is gradually replaced by mature lamellar bone.

The final bone structure becomes stronger and more similar to the original bone shape.

Fracture healing occurs through four stages: hematoma formation, fibrocartilaginous callus formation, bony callus formation, and bone remodeling.

Factors That Delay Bone Healing

Several biological and environmental factors can slow fracture repair.

Common causes include:

• Smoking, which decreases blood flow and oxygen delivery

• Diabetes, which impairs tissue repair

• Poor nutrition, especially inadequate protein and vitamin D intake

• Infection at the fracture site

• Poor immobilization or excessive movement

Complications of Fracture Healing

Delayed healing increases the risk of chronic pain, reduced mobility, and functional limitations.

Rhabdomyolysis

Rhabdomyolysis is a serious condition caused by the breakdown of skeletal muscle fibers, resulting in the release of intracellular contents into the bloodstream. The most concerning substance released is myoglobin, which can accumulate in the kidneys and lead to acute kidney injury.

Muscle injury causes elevated levels of:

• Myoglobin

• Creatine kinase (CK)

• Electrolytes such as potassium and phosphorus

Causes of Rhabdomyolysis

Common causes include:

• Severe trauma or crush injuries

• Extreme physical exertion

• Prolonged immobilization

• Drug or medication toxicity

• Heat-related injuries

• Seizures

Clinical Manifestations of Rhabdomyolysis

The classic symptoms include:

• Severe muscle pain

• Muscle weakness

• Swelling

• Dark-colored urine caused by myoglobin release

• Elevated creatine kinase levels

Complications may include:

• Acute kidney injury

• Electrolyte imbalance

• Cardiac arrhythmias due to hyperkalemia

Rhabdomyolysis occurs when damaged skeletal muscles release myoglobin into the bloodstream, potentially causing kidney injury and electrolyte disturbances.

Pediatric Musculoskeletal Disorders

Children have unique musculoskeletal characteristics because their bones are still developing. Pediatric bones contain more cartilage, have greater flexibility, and respond differently to injury compared with adult bones.

Early recognition of developmental and congenital disorders is essential because untreated conditions can affect growth, mobility, and long-term function.

Rickets

Rickets is a childhood disorder caused by defective mineralization of growing bones, most commonly due to vitamin D deficiency.

Vitamin D is essential for calcium and phosphorus absorption. Without adequate vitamin D, bones become weak and unable to properly support normal growth.

Causes of Rickets

Common causes include:

• Vitamin D deficiency

• Limited sunlight exposure

• Poor dietary intake

• Malabsorption disorders

• Certain kidney disorders

Clinical Manifestations of Rickets

Signs and symptoms may include:

• Bowed legs

• Delayed growth

• Bone pain

• Muscle weakness

• Skeletal deformities

• Delayed motor development

Rickets is caused by impaired mineralization of growing bones, usually due to vitamin D deficiency, resulting in skeletal deformities and growth abnormalities.

Genu Varum and Genu Valgum

Angular deformities of the knees are common pediatric musculoskeletal concerns.

Genu Varum (Bow-Legged Deformity)

Genu varum refers to outward curvature of the legs, causing the knees to remain separated when the feet are together.

Common causes include:

• Normal developmental variation in young children

• Rickets

• Growth abnormalities

Many cases improve naturally as children grow.

Genu Valgum (Knock-Knee Deformity)

Genu valgum occurs when the knees angle inward and touch while the ankles remain separated.

Common causes include:

• Normal growth patterns

• Obesity-related stress on joints

• Skeletal disorders

Persistent or severe deformities may require orthopedic evaluation.

Syndactyly and Polydactyly

Congenital abnormalities of the fingers and toes may occur due to altered fetal limb development.

Syndactyly

Syndactyly is the fusion of two or more fingers or toes.

Characteristics include:

• Joined digits

• Variable involvement of soft tissue or bone

• Possible functional limitations

Treatment may include surgical separation when necessary.

Polydactyly

Polydactyly refers to the presence of extra fingers or toes.

It may occur as:

• An isolated congenital finding

• Part of a genetic syndrome

Surgical correction may be considered depending on function and appearance.

Talipes Equinovarus (Clubfoot)

Clubfoot is a congenital foot deformity where the foot is positioned downward and inward.

The condition affects the alignment of:

• Foot bones

• Muscles

• Tendons

• Ligaments

Clinical Features of Clubfoot

Findings include:

• Inward turning of the foot

• Limited ankle movement

• Abnormal foot positioning

Treatment of Clubfoot

Management commonly includes:

• Serial casting

• Bracing

• Physical therapy

• Corrective surgery in severe cases

Early treatment improves mobility and functional outcomes.

Clubfoot is a congenital deformity characterized by inward and downward positioning of the foot and is commonly treated with serial casting and bracing.

Pes Planus (Flat Feet)

Pes planus occurs when the medial longitudinal arch of the foot collapses, causing the entire sole to contact the ground.

Many children have flexible flat feet that improve naturally with development.

Causes of Pes Planus

Possible causes include:

• Ligament laxity

• Muscle imbalance

• Injury

• Neuromuscular disorders

Symptoms

Some individuals experience:

• Foot pain

• Fatigue while walking

• Difficulty with prolonged standing

Scoliosis

Scoliosis is an abnormal lateral curvature of the spine.

It may occur during childhood or adolescence and can vary from mild to severe.

Structural Scoliosis

Structural scoliosis involves a fixed spinal curvature caused by changes within the vertebrae or spinal structures.

Characteristics include:

• Vertebral rotation

• Persistent curvature

• Does not correct with position changes

Common causes include:

• Idiopathic scoliosis

• Congenital abnormalities

• Neuromuscular disorders

Functional Scoliosis

Functional scoliosis occurs due to an external factor rather than a permanent spinal abnormality.

Possible causes include:

• Leg length discrepancy

• Muscle imbalance

• Poor posture

The curvature may improve when the underlying cause is corrected.

Structural scoliosis involves permanent changes in spinal anatomy, while functional scoliosis results from an external condition and may resolve when the cause is treated.

Juvenile Idiopathic Arthritis

Juvenile idiopathic arthritis (JIA) is an autoimmune inflammatory disorder affecting children younger than 16 years.

The immune system attacks joint tissues, causing chronic inflammation.

Clinical Manifestations of Juvenile Idiopathic Arthritis

Common symptoms include:

• Persistent joint swelling

• Joint pain

• Morning stiffness

• Reduced mobility

• Fatigue

Frequently affected joints include:

• Knees

• Wrists

• Ankles

Early diagnosis helps prevent joint damage and growth complications.

Osgood-Schlatter Disease

Osgood-Schlatter disease is an overuse injury affecting the tibial tubercle, where the patellar tendon attaches below the knee.

It commonly occurs during periods of rapid growth in adolescents.

Causes

Repeated stress from activities such as:

• Running

• Jumping

• Sports participation

causes irritation of the growth area.

Symptoms

Common findings include:

• Pain below the kneecap

• Tenderness over the tibial tubercle

• Swelling

• Pain worsening with activity

Osgood-Schlatter disease is an adolescent overuse injury caused by repetitive traction on the tibial tubercle during rapid bone growth.

Legg-Calvé-Perthes Disease

Legg-Calvé-Perthes disease is a childhood disorder caused by temporary loss of blood supply to the femoral head, resulting in avascular necrosis.

Clinical Manifestations

Symptoms include:

• Hip pain

• Limping

• Limited hip range of motion

• Stiffness

The condition requires monitoring to preserve hip function and prevent long-term complications.

Muscular Dystrophy

Muscular dystrophies are inherited disorders characterized by progressive muscle weakness caused by abnormalities in muscle proteins.

Major types include:

• Duchenne muscular dystrophy (DMD)

• Becker muscular dystrophy

• Myotonic dystrophy

• Limb-girdle muscular dystrophy

Duchenne vs. Becker Muscular Dystrophy

Becker muscular dystrophy generally progresses more slowly than Duchenne muscular dystrophy because dystrophin production is reduced rather than completely absent.

Osteogenesis Imperfecta

Osteogenesis imperfecta (OI), also known as brittle bone disease, is an inherited disorder caused by defective Type I collagen production.

Because Type I collagen provides structural support to bone, abnormalities result in fragile bones and frequent fractures.

Clinical Features of Osteogenesis Imperfecta

Common findings include:

• Recurrent fractures

• Bone deformities

• Short stature

• Blue sclerae

• Hearing problems

Developmental Dysplasia of the Hip

Developmental dysplasia of the hip (DDH) occurs when the hip joint does not develop normally, causing instability or displacement of the femoral head.

Early diagnosis is important because untreated DDH may lead to:

• Abnormal walking patterns

• Chronic hip pain

• Early osteoarthritis

Risk Factors for Developmental Dysplasia of the Hip

Risk factors include:

• Breech presentation

• Female sex

• Positive family history

• First-born infants

• Limited intrauterine space

Developmental dysplasia of the hip involves abnormal development of the hip joint and requires early detection to prevent long-term mobility problems.

Key NU551 Musculoskeletal Concepts Summary

Bone health depends on continuous remodeling controlled by osteoblasts, osteoclasts, and osteocytes. Connective tissue proteins such as Type I collagen provide structural strength, while minerals such as calcium phosphate provide hardness.

Important NU551 exam concepts include:

• Osteoblasts build bone

• Osteoclasts resorb bone

• Osteocytes maintain bone

• Osteoporosis involves decreased bone density

• Osteomalacia involves impaired mineralization

• Osteomyelitis is a bone infection

• Fractures heal through four predictable stages

• Pediatric bone disorders require early recognition to prevent complications

Frequently Asked Questions About the NU551 Musculoskeletal System

What is the primary function of collagen in bone?

Type I collagen is the main collagen found in bone and provides the organic framework that supports mineral deposition. It gives bones flexibility and tensile strength, preventing them from becoming too brittle.

Key point:
Collagen provides flexibility, while calcium-based minerals provide bone hardness and resistance to compression.

Which cells build and break down bone?

Bone remodeling is controlled by three major bone cells:

• Osteoblasts: Build new bone by producing osteoid and promoting mineralization.

• Osteoclasts: Break down old bone through bone resorption.

• Osteocytes: Maintain mature bone tissue and regulate remodeling activity.

Key point:
Osteoblasts form bone, osteoclasts remove bone, and osteocytes maintain bone structure.

What is the difference between compact bone and spongy bone?

Compact bone is the dense outer layer of bone responsible for strength and protection. It contains osteons that provide structural support.

Spongy bone is a lightweight inner bone tissue containing trabeculae and bone marrow.

What are the four stages of fracture healing?

Bone healing occurs through four major stages:

1. Hematoma formation – Blood collects at the fracture site and begins inflammation.

2. Fibrocartilaginous callus formation – Fibroblasts and chondroblasts create a temporary cartilage bridge.

3. Bony callus formation – Osteoblasts replace cartilage with woven bone.

4. Bone remodeling – Woven bone becomes mature lamellar bone.

Key point:
Fracture healing progresses from inflammation to soft callus formation, hard callus formation, and final remodeling.

What is the most common cause of osteomalacia?

Vitamin D deficiency is the most common cause of osteomalacia. Low vitamin D levels reduce calcium absorption, preventing normal bone mineralization.

Other contributing factors include:

• Malabsorption disorders

• Kidney disease

• Limited sunlight exposure

Which organism most commonly causes osteomyelitis?

Staphylococcus aureus is the most common pathogen responsible for osteomyelitis.

The infection causes inflammation within bone tissue and may result in bone destruction if untreated.

What is the difference between osteoporosis and osteomalacia?

Although both conditions weaken bones, they occur through different mechanisms.

What is the difference between a strain and a sprain?

A strain affects muscles or tendons, while a sprain affects ligaments.

• Strain: Muscle or tendon injury caused by overstretching or excessive force.

• Sprain: Ligament injury caused by twisting, tearing, or joint trauma.

Why are greenstick fractures common in children?

Children’s bones contain more cartilage and are more flexible than adult bones. Instead of breaking completely, pediatric bones may bend and partially fracture.

Key point:
Greenstick fractures occur because growing bones can bend before breaking.

What is the role of vitamin D in bone health?

Vitamin D supports bone health by improving calcium and phosphorus absorption from the gastrointestinal tract.

Adequate vitamin D helps:

• Maintain bone mineralization

• Support normal growth

• Reduce fracture risk

What is the difference between rheumatoid arthritis and osteoarthritis?

Rheumatoid arthritis is an autoimmune inflammatory disease, while osteoarthritis is a degenerative condition caused by cartilage breakdown.

What is the most common malignant bone tumor in children?

Osteosarcoma is the most common primary malignant bone tumor among children and adolescents.

It commonly occurs near the growth plates of long bones, especially:

• Femur

• Tibia

• Humerus

What causes osteogenesis imperfecta?

Osteogenesis imperfecta results from genetic mutations affecting Type I collagen production.

Because collagen provides structural support for bone, defective collagen causes:

• Fragile bones

• Frequent fractures

• Skeletal deformities

What are the common risk factors for developmental dysplasia of the hip?

Risk factors include:

• Breech presentation

• Female sex

• Family history

• First-born infants

• Limited fetal movement

Early screening and treatment help prevent long-term hip complications.

References

American Academy of Orthopaedic Surgeons. (2023). Bone health and fractures. OrthoInfo.
https://orthoinfo.aaos.org/

Huether, S. E., & McCance, K. L. (2023). Understanding pathophysiology (8th ed.). Elsevier.
https://www.elsevier.com/

National Institute of Arthritis and Musculoskeletal and Skin Diseases. (2023). Bone diseases and conditions. National Institutes of Health.
https://www.niams.nih.gov/

National Institutes of Health Office of Dietary Supplements. (2024). Vitamin D fact sheet for health professionals.
https://ods.od.nih.gov/factsheets/VitaminD-HealthProfessional/

NU551 Final Exam Study Guide: Key Concepts in Anatomy and Physiology

OpenStax. (2023). Anatomy and physiology 2e. OpenStax, Rice University.
https://openstax.org/details/books/anatomy-and-physiology-2e

World Health Organization. (2023). Musculoskeletal health.
https://www.who.int/health-topics/musculoskeletal-conditions