Data associated with Figure 5, scoring cartilage on the femoral trochlear and patella using the ICRS grading scale following 3 hours wear simulation Femoral trochlear Patella mean SD mean SD 4-6 month animals n=6 Negative control (no intervention) 1.17 1.13 2.67 2.18 n=6 Positive control (stainless steel pin 1mm proud) 3.50 0.84 1.92 1.07 n=5 Defect through to subchondral bone 2.70 0.84 3.40 1.56 n=5 Osteochondral graft flush 1.30 0.67 1.70 1.20 n=6 Osteochondral graft 1mm proud 3.42 1.28 2.92 2.58 12 month animals n=5 Positive control (stainless steel pin 1mm proud) 4.90 2.07 4.40 1.60 Patella Negative control (no intervention) Positive control (stainless steel pin 1mm proud) Defect through to subchondral bone Osteochondral graft flush Osteochondral graft 1mm proud Positive control (stainless steel pin 1mm proud) 5.5 1.5 5 2 3 2.5 5 1 2.5 2.5 2.5 5.5 2.5 3.5 1.5 0 7.5 6.5 1 3 5 3 0.5 4 2 1.5 3 1 0.5 3.5 0 1 3.5 Femur Negative control (no intervention) Positive control (stainless steel pin 1mm proud) Defect through to subchondral bone Osteochondral graft flush Osteochondral graft 1mm proud Positive control (stainless steel pin 1mm proud) 3 3 2.5 1 4.5 3.5 1 3 1.5 1 2 6 0.5 5 3.5 1 5 8 0.5 4 2.5 2.5 2 3 2 3 3.5 1 4 4 0 3 3