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Lateral surface displacement (us) versus applied lateral displacement (Δx) for normal (NL: ●, ○) and degenerate (DGN: ■, □) cartilage after (A) 5 and (B) 60 minutes of stress relaxation time (tsr). Samples were tested with phosphate buffered saline (PBS: ○, □) and synovial fluid (SF: ●, ■).
