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13 yr old son, in a sitting or reclining position with knee bent, suddenly will have the left knee "lock" where he cannot straighten his leg without p?

Dr. Nela Cordero, University of Santo Tomas Faculty of Medicine and Surgery Answered Aug. 19, 2012

51 years experience in Pediatrics

KNEE PROBLEM. Knee should be examined by orthopedic md.

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Dr. Mark Diamond, University of Pittsburgh School of Medicine Answered Aug. 19, 2012

43 years experience in Pediatrics

Injuery. Generally this is due to a knee injury. Need to see your doctor.

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