PAGE 1 • THE STORY
A normal-looking first test nearly closed the case. The useful part of the story was surprisingly compact: persistent inability to bear weight after fall despite normal initial radiograph. The bedside findings argued otherwise, and the team chose to believe the patient before the paper.
Case 02 was worked from first principles: onset and progression were reconstructed, associated features were separated from background noise, and only negatives capable of changing the probability of Occult femoral neck fracture or its closest mimics were given weight.
The clue worth protecting from the noise: Persistent inability to bear weight after fall despite normal initial radiograph.
Where the case turned
Time became part of the diagnosis. Some conditions can wait for elegant confirmation; others demand action while confirmation is still being arranged.
At this stage the diagnosis remained deliberately unnamed. The working differential included soft-tissue injury, infection/inflammation and an occult structural injury. The point was not to produce a long list; in this orthopaedics Case 02, the list existed only to test the story and protect against the dangerous alternative that required immediate exclusion.
PAGE 2 • REASONING UNDER PRESSURE
The next investigation was chosen because it could alter management. In this case the focused evaluation was MRI hip or CT when MRI unavailable.
What had looked like several unrelated abnormalities now behaved like one process. The clinicians interpreted the result in the context of the bedside probability; for Case 02, the test was evidence in a story, not an isolated verdict.
The diagnostic fork
The team then tried to make the leading hypothesis fail. For Occult femoral neck fracture, they asked what finding should be absent, what alternative should produce a different chronology, and what result would force a change of direction. None of the important contradictions appeared; the case became more coherent rather than less.
Reasoning checkpoint: ask three questions before moving on: Does the proposed diagnosis explain why now? Does it explain the key examination pattern? And would missing it change outcome if action were delayed?
Only then was the label allowed onto the page. In Case 02, the final answer earned its place by explaining the sequence, the bedside pattern and the management-relevant test better than the competing diagnoses.
PAGE 3 • THE REVEAL
FINAL DIAGNOSISOccult femoral neck fracture
The reveal fits because the decisive pattern was Persistent inability to bear weight after fall despite normal initial radiograph.. The role of MRI hip or CT when MRI unavailable is to strengthen, characterize or safely challenge that bedside hypothesis according to the clinical setting.
Key learning points
- Recognize the pattern that should trigger consideration of Occult femoral neck fracture: Persistent inability to bear weight after fall despite normal initial radiograph.
- Use MRI hip or CT when MRI unavailable selectively to confirm the working diagnosis, define severity, or exclude the dangerous mimic.
- Document neurovascular status before and after immobilization or reduction, and treat limb-threatening findings as emergencies.
- Reassess if the clinical course diverges from what the working diagnosis predicts; a diagnosis should explain both the positive findings and the timeline.
Take-home message
When you encounter persistent inability to bear weight after fall despite normal initial radiograph, do not stop at the first familiar label. Reconstruct the timeline, identify the dangerous mimic, and let focused testing answer a management question. In this pattern, think of Occult femoral neck fracture.
Educational synthetic Orthopaedics Case 02 for learning clinical reasoning. Real-patient management must be individualized and aligned with current specialty guidance and local protocols.