QCM : Bone Pathology: Development, Tumors, and Joint Diseases — 10 questions

Questions et réponses du QCM

1. What is osteogenesis imperfecta primarily characterized by?

A genetic disorder marked by reduced osteoclastic activity resulting in dense, brittle bones
A hereditary disorder caused by defective synthesis of type I collagen, leading to brittle bones and frequent fractures
A chronic disorder involving episodes of excessive osteoclastic bone resorption followed by disorganized bone formation
A disorder caused by defective mineralization of bone matrix due to vitamin D deficiency

A hereditary disorder caused by defective synthesis of type I collagen, leading to brittle bones and frequent fractures

Explication

Osteogenesis imperfecta is primarily characterized by defective synthesis of type I collagen, which results in brittle bones and frequent fractures, as explicitly described in the text.

2. Which characteristic feature is commonly observed in patients with osteogenesis imperfecta, a type 1 collagen disorder?

Enlarged lymph nodes
Elevated serum calcium levels
Blue sclera
Hyperpigmentation of the skin

Blue sclera

Explication

Blue sclera is a characteristic feature of osteogenesis imperfecta, caused by decreased collagen content in the sclera, making it translucent and revealing underlying choroidal tissue. This feature is specific and well-documented in the context of type I collagen disorders.

3. What is the primary function of healthy bone tissue that is disrupted in metabolic bone diseases?

To produce blood cells in the marrow
To provide structural support and resist fractures
To facilitate movement by acting as levers
To store calcium and phosphate for metabolic needs

To provide structural support and resist fractures

Explication

The main role of healthy bone tissue is to provide structural support and resist fractures. Metabolic bone diseases impair this function by affecting mineralization and remodeling, leading to weakened bones that are prone to deformities and fractures.

4. When was osteoporosis first established as a clinical diagnosis?

Early 21st century
Early 18th century
Late 19th century
Mid 20th century

Late 19th century

Explication

Osteoporosis was first recognized and described as a distinct clinical condition in the late 19th century, making the 'Late 19th century' the correct answer. The other options are either too early, before the condition was understood, or too recent, after its initial recognition.

5. How does osteoclast dysfunction differ from the osteoclastic activity observed in Paget disease of bone?

Osteoclast dysfunction results in normal bone resorption, while Paget disease is characterized by complete absence of osteoclastic activity.
Osteoclast dysfunction results in decreased bone resorption, leading to dense, brittle bones, while Paget disease involves phases of increased osteoclastic activity causing disorganized bone remodeling.
Osteoclast dysfunction causes increased bone resorption and weak bones, whereas Paget disease involves decreased osteoclastic activity leading to overly dense bones.
Osteoclast dysfunction causes abnormal bone formation without affecting resorption, unlike Paget disease which involves increased osteoclastic activity.

Osteoclast dysfunction results in decreased bone resorption, leading to dense, brittle bones, while Paget disease involves phases of increased osteoclastic activity causing disorganized bone remodeling.

Explication

Osteoclast dysfunction, as seen in osteopetrosis, leads to decreased bone resorption, resulting in dense but brittle bones. In contrast, Paget disease involves phases of increased osteoclastic activity, causing excessive and disorganized bone remodeling. Therefore, the key difference lies in the level of osteoclastic activity: decreased in osteoclast dysfunction and increased in Paget disease.

6. Who is credited with describing the role of type I collagen in osteogenesis imperfecta?

Robbins & Cotran
ElSheikhei
Murray
Sillence

Robbins & Cotran

Explication

Robbins & Cotran are credited with describing the structure and role of type I collagen in osteogenesis imperfecta within their textbook, making them the correct attribution for this concept.

7. What is the primary cause of osteomyelitis?

Bacterial infection, most commonly *Staphylococcus aureus*
Autoimmune inflammatory response targeting bone tissue
Fungal infection, particularly Candida species
Viral infection, especially herpes simplex virus

Bacterial infection, most commonly *Staphylococcus aureus*

Explication

The primary cause of osteomyelitis is bacterial infection, most commonly *Staphylococcus aureus*, which infects bone tissue through hematogenous spread, extension from nearby infections, or direct inoculation.

8. How is the classification of bone tumors applied in clinical practice to guide diagnosis and treatment?

By evaluating the presence of metastasis to distinguish primary from secondary tumors
By assessing patient age and tumor location alone to decide on surgical intervention
By determining the tissue of origin (bone or cartilage) and benign or malignant nature to plan appropriate management
By analyzing radiographic features exclusively to identify the tumor type

By determining the tissue of origin (bone or cartilage) and benign or malignant nature to plan appropriate management

Explication

The classification of bone tumors based on tissue origin and benign or malignant nature is fundamental in clinical practice, as it guides diagnosis, prognosis, and treatment planning. Knowing whether a tumor is osteogenic, chondrogenic, or metastatic helps determine the appropriate intervention.

9. What is the key feature used to classify primary bone tumors?

The tissue of origin and whether it is benign or malignant
The size of the tumor
The location within the bone
The age of the patient

The tissue of origin and whether it is benign or malignant

Explication

The primary classification of bone tumors is based on the tissue they produce—either bone or cartilage—and whether they are benign or malignant. This tissue origin and behavior are fundamental for diagnosis and treatment planning.

10. What does 'Joint Disease Classification' refer to?

A classification of joint diseases based solely on radiological appearance
A systematic grouping of joint disorders based on etiology and clinical features
A detailed description of the histological features of joint tissues
A list of all known joint diseases without categorization

A systematic grouping of joint disorders based on etiology and clinical features

Explication

The correct answer is that 'Joint Disease Classification' refers to the systematic grouping of joint disorders based on etiology, pathology, and clinical features, as explicitly described in the context.

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Developmental bone diseases — definition?

Hereditary or acquired disorders from abnormal bone development.

Osteogenesis imperfecta — cause?

Defective synthesis of type I collagen.

Osteopetrosis — characteristic feature?

Reduced osteoclastic activity leading to dense, brittle bones.

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