Chapter 22. Diseases of the Musculoskeletal System
9 topics with a brief review: definitions, key facts, and classroom questions.
In this chapter, we analyze the morphological substrate of diseases that deprive a person of freedom of movement. The section covers basic bone tissue pathology, purulent-inflammatory processes (osteomyelitis), degenerative and metabolic joint disorders (osteoarthritis and gout), as well as skeletal muscle pathology.
Special attention is paid to oncomorphology: we classify and describe in detail bone and soft tissue tumors—ranging from benign osteomas to aggressive sarcomas that require rigorous differential diagnosis.
Practical classes and exams most frequently test the macro- and microscopic picture of osteomyelitis stages, the morphology of gouty tophi, cartilage changes in osteoarthritis, and the histological differences between benign and malignant tumors. Learn to connect matrix destruction and cellular atypia with the radiographic picture—this is the key to successfully passing this section.
Which bones are most commonly affected in osteomyelitis?
The process can affect any bone, but the metaepiphyseal regions of the femur and tibia are the most vulnerable.
What is the difference between osteoid osteoma and osteoblastoma?
Histologically, these neoplasms are completely identical. The differences lie exclusively in their clinical manifestations.
In which joints does osteoarthritis most frequently develop?
The pathology predominantly affects the hip and knee joints, as well as the intervertebral joints of the cervical and lumbar spine. The interphalangeal and other joints are affected less frequently.
What is the difference between a simple and a complex fracture?
In a simple (closed) fracture, the bone does not communicate with the external environment. In a complex (open) fracture, there is soft tissue damage, and the fracture site communicates with the external environment.
What is the difference between myasthenia gravis and Lambert-Eaton syndrome?
In myasthenia gravis, antibodies block muscle acetylcholine receptors. In Lambert-Eaton syndrome, the receptors are free, but the release of the neurotransmitter itself (acetylcholine) from the nerve terminal is impaired.
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