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Table 3 Comparison of the prevalence of cysts and bursitides at baseline and at 6-month follow-up

From: Longitudinal assessment of cyst-like lesions of the knee and their relation to radiographic osteoarthritis and MRI-detected effusion and synovitis in patients with knee pain

Type of lesiona Prevalence (N= 319) (V1) Incident lesion (V2) Increase in size (V2)b Decrease in size (V2)c
Popliteal cystd* 128 (40) 6 23 39
Subgastrocnemius bursitisd* 49 (15) 0 7 6
PTFJ cyst 26 (8) 0 0 0
HFP ganglion cyst 25 (8) 0 0 1
SM-MCL bursitis 13 (4) 0 0 1
PCL ganglion cystd 11 (4) 0 0 1
ACL ganglion cystd 9 (3) 0 1 1
Medial meniscal cystd 8 (3) 0 1 1
MCL bursitis 8 (3) 0 0 0
Prepatellar bursitis 6 (2) 0 2 0
Anserine bursitis 4 (1) 0 0 0
Iliotibial bursitis 3 (1) 1 1 1
Superficial infrapatellar bursitisd 3 (1) 0 0 0
Deep infrapatellar bursitis 2 (<1) 0 0 0
Lateral meniscal cystd 0 (0) 1 1 0
  1. Data presented as number of lesions, either grand total or subtotal for each type of cystic lesion (percentage of knees that had a cystic lesion out of total 319 knees surveyed). V1, visit at baseline; V2, visit at 6-month follow-up; N = total number of knees; PTFJ, proximal tibiofibular joint; HFP, Hoffa's fat pad; SM-MCL, semi-membranosus medial collateral ligament; PCL, posterior cruciate ligament; ACL, anterior cruciate ligament; MCL, medial collateral ligament. aIn order of descending frequency at baseline. bThe count for increase in size includes incident lesions seen at V2. cThe count for decrease in size includes lesions present at V1 but absent at V2. dMeaningful size measurements were performed in these lesions only. A significant size change was defined to be ≥5 mm change for popliteal cysts and ≥2 mm for other lesions. For lesions without size measurements, increase in size means appearance of a new lesion at V2 and decrease in size means complete resolution of a pre-existing lesion at V2. *Significant rate of change in size between baseline and follow-up (P < 0.001, by Wilcoxon signed-rank test).