Avascular Necrosis in Pediatric Leukemia/Lymphoma Patients: A Critical Complication

Strategic Insights -

A new study has shed light on the specific locations of avascular necrosis (AVN) in pediatric leukemia/lymphoma patients undergoing high-dose steroid therapy. According to the research published in the Journal of Pediatric Orthopaedics, AVN is a serious complication that affects multiple bones and joints, leading to significant pain and early-onset osteoarthritis. The study, which evaluated a cohort of 84 patients, found that the most common sites of AVN include the proximal tibial metaphysis, distal femoral metaphysis, and femoral head epiphysis.

Key Takeaways:

  • The study found that AVN in pediatric leukemia/lymphoma patients on steroid therapy has a clear predilection for specific locations in long bones, with the femur, tibia, and humerus being the most commonly affected.
  • The most common sites of AVN include the proximal tibial metaphysis, distal femoral metaphysis, and femoral head epiphysis, with 89% of cases occurring in the proximal tibial metaphysis.
  • The study demonstrated that using the Bone Location for AVN from STeroids (BLAST) classification system, practitioners can better characterize the location of AVN, monitor high-risk locations for joint collapse, and track early outcomes of preventative treatment.
  • The development of prospective multicenter AVN study groups and screening protocols for early detection is critical to improve functional outcomes and joint preservation for leukemia/lymphoma survivors and all other patients taking high-dose steroids.
  • The study highlights the importance of early detection and intervention for AVN to prevent pain and progressive joint collapse.
  • The research was conducted by a team of researchers led by Amin Alayleh, Stanford University, School of Medicine, Dept. of Orthopedic Surgery.
  • The study included a cohort of 84 patients with acute lymphoblastic leukemia (ALL) and acute myeloid leukemia (AML), with a median age of 14.8 years at leukemia diagnosis and 16.5 years at AVN diagnosis.

Statistics:

  • 84 patients were included in the study, with 49 males and 35 females.
  • The median age at leukemia diagnosis was 14.8 years, and the median age at AVN diagnosis was 16.5 years.
  • 74% of patients had B-cell ALL, 21% had T-cell ALL, and 5% had AML.
  • The most common locations of AVN were the femur (87%), tibia (68%), and humerus (25%).
  • Using the BLAST classification, the most common sites of AVN overall included the proximal tibial metaphysis (61%), distal femoral metaphysis (60%), and femoral head epiphysis (50%).

Sources:

  • NewsRx. New Findings in Lymphoma Described from Stanford University (Retrospective Analysis and Characterization of Avascular Necrosis By Bone Location In Pediatric Leukemia/lymphoma Patients). Hematology Week. August 4, 2025; p 404.
  • Journal of Pediatric Orthopaedics. Retrospective Analysis and Characterization of Avascular Necrosis By Bone Location In Pediatric Leukemia/lymphoma Patients. Lippincott Williams & Wilkins, 2025; 45(7).