A Multicenter Trial of Sprifermin (AS902330 [Recombinant Human Fibroblast Growth Factor-18]) or Placebo After Microfracture Surgery for Cartilage Injury of the Knee

This is a Phase 2, double-blind, multicenter, randomized, placebo-controlled trial to evaluate the efficacy and safety of Sprifermin (AS902330) (recombinant human fibroblast growth factor-18 \[rhFGF-18\]) as an adjunct treatment to subjects following microfracture (MFx) surgery for cartilage injury of the knee. Primary Objectives * To evaluate the effect of Sprifermin (AS902330) intra-articular knee injections as adjunct to microfracture (MFx) surgery on the composition of the refilled cartilage in the target knee, as measured by gadolinium-enhanced magnetic resonance imaging (MRI) of cartilage (dGEMRIC) time constant 1 (T1) relaxation time at 6 months after MFx surgery * To evaluate the safety profile of Sprifermin (AS902330) when administered intra-articular into the knee as adjunct to MFx surgery in subjects with cartilage injury of the knee Secondary Objectives * To further support the efficacy and safety of Sprifermin (AS902330) as an adjunct to MFx for cartilage injury repair through symptomatic outcomes and quantitative MRI measurement