Why does an ACL (anterior cruciate ligament) tear in the knee often result in subsequent osteoarthritis even after successful surgical repair of the ligament itself?

💡 Explanation

ACL injury alters knee joint biomechanics, which increases stress on the articular cartilage surfaces. This initiates chondrocyte damage and degradation of the cartilage matrix, predisposing the joint to osteoarthritis because articular cartilage lacks intrinsic healing capacity. Therefore, biomechanical alteration is the key driver, rather than inflammation alone, and surgical repair can't fully restore the original joint mechanics.

• Why does chronic inflammation in rheumatoid arthritis exacerbate joint damage despite NSAID treatment?
• A mountain climber ascends rapidly to 14,000 feet. Which consequence will occur in their blood due to the Bohr effect interacting with 2,3-BPG?
• In children with chronic kidney disease, what explains why rickets can develop despite sufficient dietary vitamin D intake?
• If an athlete sustains a concussion with suspected diffuse axonal injury, why does the initial assessment prioritize cognitive rest over immediate vestibular rehabilitation?
• Which risk increases when tendon elasticity exceeds limits?
• What causes impaired motor skill consolidation after sleep deprivation?