[Translated article] Subchondral bone damage has no influence in 12-week clinical outcome in patients with knee osteoarthritis treated with intraarticular platelet-rich plasma: A retrospective study.

Objective: To determine if subchondral bone damage can influence the clinical results of intraarticular platelet-rich-plasma (PRP) treatment in knee osteoarthritic patients.

Material and methods: A retrospective review of patients treated with intraarticular PRP injections for knee osteoarthritis who previously underwent a magnetic resonance (MR) of the knee was performed. Visual Analogic Score (VAS) was assessed for pain, whereas WORMS MR score was adapted to assess the damage to the subchondral bone (WORMSsc score).

Results: Sixty-one patients were treated with 3 weekly injections of PRP. Mean VAS reduction was 27.67±13.13 points (p<.005). WORMS sc mean score was 32±18.5 points. No correlation between WORMSsc and VAS was found. A moderate correlation between WORMSsc score and preoperative VAS was found (r=.43; p<.005).

Conclusion: There is no correlation between the damage to the subchondral bone assessed by MR and pain relief at 12 weeks in patients treated with intraarticular platelet-rich plasma in patients with knee osteoarthritis. A greater damage to the subchondral bone could be associated with more pain.