Orthopaedics Ahlback Grade2 changes of Osteoarthritis of the knee means: A Joint space obliterated or almost obliterated B Minor bone attrition (<5 mm) C Moderate bone attrition (5-15 mm) D Severe bone attrition (>15 mm) 💡 Explanation Ahlback Grade2 changes of Osteoarthritis of the knee means: ✓ Correct Answer: A. Joint space obliterated or almost obliterated