Lactic acid accumulates in the muscles NOT the joints.
When the body cant supply enough oxygen to meet demand during anerobic exercise lactic acid starts to accumulate in the MUSCLES. When the exercise intensity is lowered or stops, accumulated lactic acid is removed form the muscles almost immediately*.
If you have joint pain it is not from lactic acid, it could be an injury, a symptom of gout (sometimes crystals of uric acid forms in joints). I would recommend speaking to your doctor.
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