Sprifermin (AS902330) will be administered at a dose of 30 mcg as intra-articular injection once every week for 3 consecutive weeks.

Sprifermin (AS902330) will be administered at a dose of 100 mcg as intra-articular injection once every week for 3 consecutive weeks.

Placebo matched to sprifermin (AS902330) will be administered as intra-articular injection once every week for 3 consecutive weeks.

The change in cartilage defect volume at Months 3, 6 and 12 based on central MRI was calculated as volume at Months 3, 6 and 12 minus volume at baseline, respectively.

The change in cartilage defect thickness at Months 3, 6 and 12 based on central MRI was calculated as thickness at Months 3, 6 and 12 minus thickness at baseline, respectively.

MOCART scoring system (comprising 9 variables) was used to describe the morphology & signal intensity of the repair tissue following MRI -degree of defect repair [DDR] score 0 (subchondral bone exposed) to 20 (complete repair); integration to the border zone [IBZ] score 0 (> 50% of length of repair tissue) to 15 (complete integration to border zone);surface of repair tissue [SRT] score 0 (>50% surface repair tissue/total degradation) to 10(surface intact);structure of repair tissue [StRT] score 0(inhomogenous/cleft formation) to 5 (homogenous);signal intensity [T2] Mapping Sequence [T2MS] and Hi-Res Sagittal Pharmacodynamic Sequence [Hi-Res SPS] score 0 (marked hyper intense for T2MS and hypo intense for Hi-Res SPS) to 15 (iso intense); subchondral lamina,subchondral bone score 0 (not impact) to 5 (intact);adhesions & effusion score 0 (yes) and 5 (no). Higher values represent more favorable outcome of repair.

The BLOKS scoring system assesses intra-articular regions within the knee according to the following features: BML size, cartilage 1, osteophyte size, synovitis, effusion, meniscal extrusion, and meniscal tear. Change from baseline in summary scores for BML size, osteophyte size, MES, and MTS were reported. Summary scores for BML size range from 0 to 27, for osteophyte size range from 0 to 36, for MES range from 0 to 12, and for MTS range from 0 to 32, with lower scores corresponding to favorable outcomes.

The BLOKS scoring system assesses intra-articular regions within the knee according to the following features: BML size, cartilage 1, osteophyte size, synovitis, effusion, meniscal extrusion, and meniscal tear. Total number of participants with shift from baseline in various BLOKS sub-scales (cartilage 1 [patella medial, patella lateral, femur medial trochlea, femur lateral trochlea, medial weight bearing femur, lateral weight bearing femur, tibia medial, tibia lateral], synovitis, and effusion) scores at Month 12 were reported.

The ICRS grading is used to score the amount of cartilage repair and damage. The grades range from 1 to 4 where higher grades indicate more severity of injury. Number of participants with change value of -3, -2, -1, 0, 1, and 2 from baseline in ICRS grade at Months 6 and 12 were reported. Lower change value indicates less severity of injury.

The KOOS is a knee-specific self-administered questionnaire that assesses symptoms and problems associated with knee injury and osteoarthritis. It consists of 42 items grouped into 5 sub-scales: symptoms, pain, function in daily living (FDL), function in sports and recreation activities (FSRA), and quality of life (QoL). Sub-scale scores range from 0-100, with 0 representing extreme knee problems and 100 no knee problems. The IKDC consists of 19 items to summarize symptoms such as highest level of activity without significant pain, frequency and severity of pain scales, stiffness and swelling, highest levels of activity without significant swelling or giving way, knee lock or catch, highest level of activity that can be performed on a regular basis, effect of knee on ability to perform set tasks, knee function prior to injury, and current knee function. The IKDC scores range from 0-100 where high score represents high levels of function.

Participants were asked to evaluate and rate the treatment benefit as poor, fair, good, very good or excellent.

An adverse event (AE) is defined as any untoward medical occurrence in a subject or clinical investigation subject administered a pharmaceutical product, which does not necessarily have a causal relationship with this treatment. An SAE is an AE that resulted in any of the following outcomes: death; life threatening; persistent/significant disability/incapacity; initial or prolonged inpatient hospitalization; congenital anomaly/birth defect. TEAEs are those AEs that either started or worsened in severity on or after the date of first dose of study drug and on or before Month 12. Local TEAEs are those only related to the target knee. Systemic TEAEs are those that are related to other parts of the body.

Acute inflammatory reaction (AIR) is defined as an increase of pain by 30 millimeter (mm) on a 100 mm visual analog scale (VAS) associated with a subject-reported synovial fluid effusion within 3 days following intra-articular injection.

Number of participants with BAbs and NAbs to FGF18 at Week 1 (pre-dose), Week 2 (pre-dose), Week 4, Months 3 and 12 were reported.

Sprifermin (AS902330) was administered at a dose of 100 mcg as intra-articular injection once every week for 3 consecutive weeks.

Placebo matched to sprifermin (AS902330) was administered as intra-articular injection once every week for 3 consecutive weeks.

Total of all reporting groups

Sprifermin (AS902330) was administered at a dose of 100 mcg as intra-articular injection once every week for 3 consecutive weeks.

Placebo matched to sprifermin (AS902330) was administered as intra-articular injection once every week for 3 consecutive weeks.

Percent change in cartilage defect volume and cartilage defect thickness at Months 3 and 6 based on central MRI was calculated as: ([volume or thickness at Months 3 and 6 minus volume or thickness at baseline, respectively]*100)/volume or thickness at baseline.

The mITT analysis set included all participants from the ITT analysis set who had at least 1 post-treatment magnetic resonance imaging assessment. "n" signifies the participants who were evaluable for this outcome measure for each group, respectively.

The change in cartilage defect volume at Months 3, 6 and 12 based on central MRI was calculated as volume at Months 3, 6 and 12 minus volume at baseline, respectively.

The mITT analysis set included all participants from the ITT analysis set who had at least 1 post-treatment magnetic resonance imaging assessment. "n" signifies the participants who were evaluable for this outcome measure for each group, respectively.

The change in cartilage defect thickness at Months 3, 6 and 12 based on central MRI was calculated as thickness at Months 3, 6 and 12 minus thickness at baseline, respectively.

The modified intent-to-treat (mITT) analysis set included all participants from the ITT analysis set who had at least 1 post-treatment magnetic resonance imaging assessment. "n" signifies the participants who were evaluable for this outcome measure for each group, respectively.

MOCART scoring system (comprising 9 variables) was used to describe the morphology & signal intensity of the repair tissue following MRI -degree of defect repair [DDR] score 0 (subchondral bone exposed) to 20 (complete repair); integration to the border zone [IBZ] score 0 (> 50% of length of repair tissue) to 15 (complete integration to border zone);surface of repair tissue [SRT] score 0 (>50% surface repair tissue/total degradation) to 10(surface intact);structure of repair tissue [StRT] score 0(inhomogenous/cleft formation) to 5 (homogenous);signal intensity [T2] Mapping Sequence [T2MS] and Hi-Res Sagittal Pharmacodynamic Sequence [Hi-Res SPS] score 0 (marked hyper intense for T2MS and hypo intense for Hi-Res SPS) to 15 (iso intense); subchondral lamina,subchondral bone score 0 (not impact) to 5 (intact);adhesions & effusion score 0 (yes) and 5 (no). Higher values represent more favorable outcome of repair.

The mITT analysis set included all participants from the ITT analysis set who had at least 1 post-treatment magnetic resonance imaging assessment. "n" signifies the participants who were evaluable for this outcome measure for each group, respectively.

The BLOKS scoring system assesses intra-articular regions within the knee according to the following features: BML size, cartilage 1, osteophyte size, synovitis, effusion, meniscal extrusion, and meniscal tear. Change from baseline in summary scores for BML size, osteophyte size, MES, and MTS were reported. Summary scores for BML size range from 0 to 27, for osteophyte size range from 0 to 36, for MES range from 0 to 12, and for MTS range from 0 to 32, with lower scores corresponding to favorable outcomes.

The mITT analysis set included all participants from the ITT analysis set who had at least 1 post-treatment magnetic resonance imaging assessment. "n" signifies the participants who were evaluable for this outcome measure for each group, respectively.

The BLOKS scoring system assesses intra-articular regions within the knee according to the following features: BML size, cartilage 1, osteophyte size, synovitis, effusion, meniscal extrusion, and meniscal tear. Total number of participants with shift from baseline in various BLOKS sub-scales (cartilage 1 [patella medial, patella lateral, femur medial trochlea, femur lateral trochlea, medial weight bearing femur, lateral weight bearing femur, tibia medial, tibia lateral], synovitis, and effusion) scores at Month 12 were reported.

The mITT analysis set included all participants from the ITT analysis set who had at least 1 post-treatment magnetic resonance imaging assessment.

The ICRS grading is used to score the amount of cartilage repair and damage. The grades range from 1 to 4 where higher grades indicate more severity of injury. Number of participants with change value of -3, -2, -1, 0, 1, and 2 from baseline in ICRS grade at Months 6 and 12 were reported. Lower change value indicates less severity of injury.

The mITT analysis set included all participants from the ITT analysis set who had at least 1 post-treatment magnetic resonance imaging assessment. "n" signifies the participants who were evaluable for this outcome measure for each group, respectively.

The KOOS is a knee-specific self-administered questionnaire that assesses symptoms and problems associated with knee injury and osteoarthritis. It consists of 42 items grouped into 5 sub-scales: symptoms, pain, function in daily living (FDL), function in sports and recreation activities (FSRA), and quality of life (QoL). Sub-scale scores range from 0-100, with 0 representing extreme knee problems and 100 no knee problems. The IKDC consists of 19 items to summarize symptoms such as highest level of activity without significant pain, frequency and severity of pain scales, stiffness and swelling, highest levels of activity without significant swelling or giving way, knee lock or catch, highest level of activity that can be performed on a regular basis, effect of knee on ability to perform set tasks, knee function prior to injury, and current knee function. The IKDC scores range from 0-100 where high score represents high levels of function.

The mITT analysis set included all participants from the ITT analysis set who had at least 1 post-treatment magnetic resonance imaging assessment. "n" signifies the participants who were evaluable for this outcome measure for each group, respectively.

Participants were asked to evaluate and rate the treatment benefit as poor, fair, good, very good or excellent.

The mITT analysis set included all participants from the ITT analysis set who had at least 1 post-treatment magnetic resonance imaging assessment. "n" signifies the participants who were evaluable for this outcome measure for each group, respectively.

An adverse event (AE) is defined as any untoward medical occurrence in a subject or clinical investigation subject administered a pharmaceutical product, which does not necessarily have a causal relationship with this treatment. An SAE is an AE that resulted in any of the following outcomes: death; life threatening; persistent/significant disability/incapacity; initial or prolonged inpatient hospitalization; congenital anomaly/birth defect. TEAEs are those AEs that either started or worsened in severity on or after the date of first dose of study drug and on or before Month 12. Local TEAEs are those only related to the target knee. Systemic TEAEs are those that are related to other parts of the body.

Safety analysis set included all participants who received at least 1 dose of trial treatment and who had at least 1 post injection safety assessment.

Acute inflammatory reaction (AIR) is defined as an increase of pain by 30 millimeter (mm) on a 100 mm visual analog scale (VAS) associated with a subject-reported synovial fluid effusion within 3 days following intra-articular injection.

Safety analysis set included all participants who received at least 1 dose of trial treatment and who had at least 1 post injection safety assessment. "N" (number of participants analyzed) signifies the participants who were evaluable for this outcome measure.

Number of participants with BAbs and NAbs to FGF18 at Week 1 (pre-dose), Week 2 (pre-dose), Week 4, Months 3 and 12 were reported.

Safety analysis set included all participants who received at least 1 dose of trial treatment and who had at least 1 post injection safety assessment.

Sprifermin (AS902330) was administered at a dose of 30 mcg as intra-articular injection once every week for 3 consecutive weeks.

Sprifermin (AS902330) was administered at a dose of 100 mcg as intra-articular injection once every week for 3 consecutive weeks.

Placebo matched to sprifermin (AS902330) was administered as intra-articular injection once every week for 3 consecutive weeks.