Clinical Outcomes and Economic Assessment of Meniscal Allograft Transplantation Following Meniscectomy

Overview

Meniscectomy, often performed after meniscal injury, significantly increases the risk of knee osteoarthritis (OA), with rates rising over decades post-surgery. Meniscal allograft transplantation (MAT) has been shown to improve symptoms but lacks definitive evidence for chondroprotection or OA prevention. Long-term studies reveal high OA prevalence in meniscectomised knees compared to controls, emphasizing the clinical challenge of managing post-meniscectomy degeneration.

Background

The menisci play a crucial role in distributing load across the knee joint, protecting articular cartilage. Meniscectomy, especially in young patients following traumatic injury, disrupts this function and predisposes to early OA due to increased cartilage stress. Differentiating traumatic meniscal injuries from degenerative lesions common in older adults is important, as treatment strategies differ. Despite symptomatic improvement with MAT, robust randomized controlled trials comparing MAT to conservative management are lacking, complicating assessment of its long-term benefits on OA progression.

Data Highlights

Key Findings

• Meniscectomy significantly increases the risk of developing knee OA, with prevalence rates up to 87% in long-term follow-up cohorts.
• OA development post-meniscectomy is time-dependent, with radiographic changes increasing markedly after 20 years.
• Meniscal allograft transplantation improves symptoms but lacks conclusive evidence for preventing OA progression.
• Contralateral knees in meniscectomised patients show increased OA risk, complicating control comparisons.
• OA risk is influenced by factors such as extent of meniscal removal, presence of cartilage damage at injury, and knee alignment.
• Meta-analyses report an odds ratio of approximately 3.5 for OA development after meniscectomy compared to controls.

Clinical Implications

Clinicians should recognize the high risk of OA following meniscectomy, particularly in younger patients, and consider this when planning treatment. While MAT offers symptomatic relief, its role in chondroprotection remains uncertain, highlighting the need for individualized patient counseling and long-term monitoring. Conservative management may be preferable in degenerative meniscal lesions to avoid accelerating OA progression.

Conclusion

Meniscectomy is associated with a substantial increase in knee osteoarthritis risk over time, and although meniscal allograft transplantation improves symptoms, definitive evidence for its protective effect against OA is lacking. Further high-quality studies are needed to clarify the long-term benefits of MAT in preserving joint health.

References

1. Hannon et al. / IMREF Consensus 2015 -- History of Meniscectomy and Meniscal Allograft Transplantation
2. Pengas et al. 1960s-70s -- Long-term OA after Meniscectomy in Young Patients
3. Smith et al. 2016 -- Systematic Review of MAT Outcomes
4. Roos et al. -- OA Prevalence 21 Years Post-Meniscectomy
5. Claes et al. 2010 -- Meta-analysis of OA after Meniscectomy
6. Paradowski et al. -- Radiographic OA after Meniscectomy