Free orthopedic surgery MCQ exam model for clinical students

Explanation:

• Knee joint → Correct because it is weight-bearing and commonly degenerates.

• Hip joint → Incorrect because it is less commonly affected than knee.

• Shoulder joint → Incorrect because it is non–weight-bearing.

• Elbow joint → Incorrect because it is rarely affected.

• Ankle joint → Incorrect because it is usually affected post-trauma.

Explanation:

• Joint space narrowing → Correct because cartilage loss reduces joint space early.

• Osteophyte formation → Incorrect because it occurs later.

• Subchondral sclerosis → Incorrect because it is a later change.

• Subchondral cyst → Incorrect because it develops later.

• Bone erosion → Incorrect because it is seen in inflammatory arthritis.

Explanation:

• Musculoskeletal system → Correct because orthopedics focuses on bones, joints, muscles, ligaments, and tendons.

• Nervous system → Incorrect because this is neurology/neurosurgery.

• Cardiovascular system → Incorrect because this is cardiology.

• Respiratory system → Incorrect because this is pulmonology.

• Endocrine system → Incorrect because this is endocrinology.

Explanation:

• Thoracic spine → Correct because it is the most commonly involved region in Pott disease.

• Cervical spine → Incorrect because it is less common.

• Lumbar spine → Incorrect because it is second most common.

• Sacral spine → Incorrect because it is rare.

• Coccyx → Incorrect because it is very rare.

Explanation:

• Osteosarcoma → Correct because it is the most common primary malignant bone tumor.

• Osteochondroma → Incorrect because it is benign.

• Ewing sarcoma → Incorrect because it is less common.

• Chondrosarcoma → Incorrect because it occurs in older adults.

• Multiple myeloma → Incorrect because it is a hematological malignancy.

Explanation:

• Fat embolism → Correct because it commonly follows long bone fractures.

• Infection → Incorrect because it occurs mainly in open fractures.

• Non-union → Incorrect because it is a late complication.

• Compartment syndrome → Incorrect because it is less common.

• Malunion → Incorrect because it occurs due to improper healing.

Explanation:

• Distal radius → Correct because Colles fracture is a distal radius fracture with dorsal displacement.

• Proximal humerus → Incorrect because it is a shoulder fracture.

• Ulna shaft → Incorrect because it is a forearm shaft fracture.

• Carpal bones → Incorrect because these are wrist bones.

• Metacarpals → Incorrect because they are hand bones.

Explanation:

• Femoral neck fracture → Correct because osteoporosis and falls commonly cause it in elderly.

• Clavicle fracture → Incorrect because it is more common in young adults.

• Colles fracture → Incorrect because it is common but less than hip fractures.

• Humeral shaft fracture → Incorrect because it is less frequent.

• Tibial shaft fracture → Incorrect because it occurs with high-energy trauma.

Explanation:

• Total hip replacement → Correct because it provides definitive pain relief and function restoration.

• Analgesics → Incorrect because they provide temporary relief.

• Physiotherapy → Incorrect because it cannot reverse joint destruction.

• Intra-articular steroid injection → Incorrect because it offers short-term relief.

• Arthroscopic lavage → Incorrect because it is ineffective in end-stage disease.

Explanation:

• Staphylococcus aureus → Correct because it is the commonest organism causing hematogenous osteomyelitis.

• Escherichia coli → Incorrect because it is less common.

• Mycobacterium tuberculosis → Incorrect because it causes chronic osteomyelitis.

• Pseudomonas aeruginosa → Incorrect because it is seen in puncture wounds.

• Salmonella species → Incorrect because it is associated with sickle cell disease.