A patient, aged 56 years, presented with severe acute right knee pain without injury. The patient reported getting out of his car two days ago when he felt a sudden, sharp pain. He had not been able to extend or put weight on his knee since.
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The patient’s inability to extend and weight bear on the knee is most likely due to a loose body (Figure 3).
The white arrow points to the large loose body in the lateral knee. The loose body is mostly likely impinged between the lateral femoral condyle and lateral tibial plateau causing the patients inability to extend and weight bear.
Dagan Cloutier, MPAS, PA-C, practices in a multispeciality orthopedic group in the southern New Hampshire region and is editor in chief of the Journal of Orthopedics for Physician Assistants (JOPA).