Cartilage repair Mesa: autograft and allograft use different tissue sources

Autograft uses cartilage from the same knee

OATS means osteochondral autograft transfer, or moving your own cartilage with the bone beneath it. A surgeon takes small plugs from a knee area that bears less weight, then uses them to fill the damage. Donor tissue isn't needed, but each place supplying a plug must heal too.

Why isn't this used for every damaged area? A knee has only so much cartilage it can safely spare. A wide area may need more tissue than the knee can provide. The surgeon also checks the spot's location, the bone below it, and any earlier operation.

Recovery takes months, so your home help and ability to keep weight off the leg both matter.

Using your own tissue also creates another place that must heal.

An osteochondral allograft uses donor cartilage and bone

An osteochondral allograft is donor cartilage with the supporting bone still attached. It can fill a larger or deeper damaged area without taking plugs from your knee. The graft must match the damaged spot and be available when surgery is planned. Walking returns slowly after the operation.

Studies mainly followed active adults with one deep damaged spot and little broad wear. Many had less soreness and better knee use for years, although some later needed another operation. The results suggest either source can help the right knee, but they don't promise your result.

One QC Kinetix option is concentrated platelet-rich plasma (PRP): blood is drawn, platelets are gathered, and that portion is returned to your joint.

That office care is not graft surgery and cannot replace a surgeon's opinion.

Sources

1. Sixty competitive athletes (mean age 24.3) with a symptomatic knee cartilage lesion were randomised to mosaic osteochondral autologous transplantation or microfracture. At a mean 37 months, 96% of the transplantation group had excellent or good results versus 52% after microfracture.

   Gudas R, et al. — A prospective randomized clinical study of mosaic osteochondral autologous transplantation versus microfracture for the treatment of osteochondral defects in the knee joint in young athletes.. Arthroscopy, 2005. DOI: 10.1016/j.arthro.2005.06.018.

2. At 10 years in the same randomised athlete cohort, osteochondral autologous transplantation remained significantly better than microfracture, with 4 failures (14%) after transplantation versus 11 (38%) after microfracture. Both groups' scores had declined from their earlier peak, and Kellgren-Lawrence grade I changes were present in 25% of the transplantation group and 48% of the microfracture group.

   Gudas R, et al. — Ten-year follow-up of a prospective, randomized clinical study of mosaic osteochondral autologous transplantation versus microfracture for the treatment of osteochondral defects in the knee joint of athletes.. Am J Sports Med, 2012. DOI: 10.1177/0363546512458763.

3. In 102 patients with a single medial femoral condyle defect of 1 to 5 cm2, mosaicplasty produced clinically meaningful better Lysholm scores than microfracture at six months, one year, five years and ten years, but by 15 to 18 years the remaining eight-point difference was no longer statistically significant.

   Solheim E, et al. — Long-term clinical follow-up of microfracture versus mosaicplasty in articular cartilage defects of medial femoral condyle.. Knee, 2017. DOI: 10.1016/j.knee.2017.08.061.

4. Across 19 studies and 1,036 patients, osteochondral allograft transplantation of the knee had a mean five-year survival of 86.7% (range 64.1% to 100%) and a mean 10-year survival of 78.7%. Allograft moves mature cartilage and its underlying bone into the defect in one operation rather than asking the body to make new tissue.

   Familiari F, et al. — Clinical Outcomes and Failure Rates of Osteochondral Allograft Transplantation in the Knee: A Systematic Review.. Am J Sports Med, 2018. DOI: 10.1177/0363546517732531.

5. A meta-analysis of 20 level 1-2 studies (364 osteochondral autografts, 272 allografts) found mean postoperative survival of 88.2% versus 87.2% at 5.4 and 5.2 years respectively (P = .66), with patient-reported outcomes improving 65.1% and 81.1% but no significant difference between the two in outcome change or graft failure risk. Neither graft source was superior; patient selection was the variable that mattered.

   Trofa DP, et al. — Isolated Osteochondral Autograft Versus Allograft Transplantation for the Treatment of Symptomatic Cartilage Lesions of the Knee: A Systematic Review and Meta-analysis.. Am J Sports Med, 2023. DOI: 10.1177/03635465211053594.

6. The patellofemoral compartment accounts for 20% to 30% of significant symptomatic chondral pathology. A systematic review of osteochondral allograft in that compartment found only 8 studies and 129 patients, with mean survival of 87.9% at five years and 77.2% at ten years - but most cases involved concomitant procedures, so the isolated effect of the graft is not established.

   Chahla J, et al. — Osteochondral Allograft Transplantation in the Patellofemoral Joint: A Systematic Review.. Am J Sports Med, 2019. DOI: 10.1177/0363546518814236.

7. In six studies covering 349 patients who received an osteochondral allograft AFTER a failed index cartilage procedure - 73.8% of them marrow stimulation - the mean defect at revision measured 5.8 cm2 (range 4.0 to 9.5) and the overall failure rate after the salvage allograft was 16.6%. A failed first procedure usually means a bigger, harder second one.

   Gopinatth V, et al. — Osteochondral Allograft Transplantation as a Salvage Procedure After Failed Index Cartilage Surgery of the Knee: A Systematic Review.. Am J Sports Med, 2025. DOI: 10.1177/03635465241238466.

8. A contemporary systematic review of 52 studies (2,387 athletes) found pooled return to sport of 80.3% (95% CI 73.3% to 86.5%) after knee cartilage restoration. MACI (OR 2.15) and osteochondral autograft (OR 1.83) had the highest odds of returning at the same or a higher level of play, while microfracture was the ONLY treatment associated with returning at a lower level (OR 0.78). The fastest mean return was after osteochondral autograft at 6.6 months.

   Kunze KN, et al. — High Rate of Return to Sport for Athletes Undergoing Articular Cartilage Restoration Procedures for the Knee: A Systematic Review of Contemporary Studies.. Am J Sports Med, 2025. DOI: 10.1177/03635465241280975.