Table 4

Change in patellofemoral cartilage thickness over the total (0–5 years), early (0–2 years) and late (2–5 years) follow-up periods: graft type

Outcome (µm)Hamstring-tendonBone-patellar tendon-boneP value
Total follow-up period (0–5 years)
 Participants included in analysisn=46n=40
 Patella0 (−28 to 29)−36 (−96 to 24)0.179
 Trochlea−34 (−66 to–2)−78 (−141 to –15)0.177
 Total patellofemoral joint−34 (−90 to 22)−114 (−227 to 2)0.140
Early follow-up period (0–2 years)*
 Participants included in analysisn=42n=37
 Patella−17 (−37 to 4)−10 (−50 to 31)0.715
 Trochlea−39 (−72 to –7)−64 (−114 to –14)0.396
 Total patellofemoral joint−56 (−103 to –9)−74 (−156 to 9)0.723
Late follow-up period (2–5 years)
 Participants included in analysisn=44n=39
 Patella11 (−17 to 39)−28 (−64 to 9)0.076
 Trochlea6 (−14 to 27)−17 (−47 to 13)0.161
 Total patellofemoral joint17 (−27 to 61)−45 (−101 to 11)0.068
  • *Only participants treated with ACLR within first 2 years of follow-up included in baseline to year-2 analysis.

  • †Changes in cartilage thickness (µm) are mean and 95% CI. P values calculated from linear mixed effects model (ie, the interaction between fixed-effects of group and follow-up periods, adjusted for age and sex). Includes both early ACLR and delayed ACLR.

  • BPTB, bone-patellar tendon-bone; HT, hamstring tendon.