Which fracture type is caused by repetitive stress and may not be seen on initial radiographs?

Which fracture type is caused by repetitive stress and may not be seen on initial radiographs?

• A. Greenstick
• B. Comminuted
• C. Oblique
• D. Stress

Answer: (D)

Stress fractures come from repeated, submaximal loading that slowly creates microscopic cracks in bone faster than it can remodel them. Because the damage starts as tiny, incomplete cracks, initial X-rays may be normal or show only subtle changes; the fracture line often becomes visible only after some time as periosteal reaction or a clearer lucent line develops. Clinically, you’d expect focal pain that worsens with activity and improves with rest, typical in runners, dancers, or military recruits. When there's suspicion despite negative X-rays, MRI or bone scan is more sensitive and can reveal the injury earlier. Management focuses on rest and gradual return to activity once healing occurs. Other fracture types involve different mechanisms: greenstick fractures are incomplete breaks seen in children with bending forces; comminuted fractures involve multiple fragments from high-energy trauma; oblique fractures have a diagonal break often from a twisting force. The description given—repetitive stress with possible negative initial radiographs—fits stress fracture best.

Stress fractures come from repeated, submaximal loading that slowly creates microscopic cracks in bone faster than it can remodel them. Because the damage starts as tiny, incomplete cracks, initial X-rays may be normal or show only subtle changes; the fracture line often becomes visible only after some time as periosteal reaction or a clearer lucent line develops. Clinically, you’d expect focal pain that worsens with activity and improves with rest, typical in runners, dancers, or military recruits. When there's suspicion despite negative X-rays, MRI or bone scan is more sensitive and can reveal the injury earlier. Management focuses on rest and gradual return to activity once healing occurs.

Other fracture types involve different mechanisms: greenstick fractures are incomplete breaks seen in children with bending forces; comminuted fractures involve multiple fragments from high-energy trauma; oblique fractures have a diagonal break often from a twisting force. The description given—repetitive stress with possible negative initial radiographs—fits stress fracture best.