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Table 2 Frequency of Degenerative Ligaments/Tendons Among Accelerated Knee Osteoarthritis (AKOA), Common Knee Osteoarthritis (KOA), No KOA

From: Accelerated knee osteoarthritis is associated with pre-radiographic degeneration of the extensor mechanism and cruciate ligaments: data from the Osteoarthritis Initiative

Frequency (n [%]) Visit AKOA Typical KOA No KOA
Cruciate Ligaments -2 39 (43) 14 (22) 25 (26)
(Anterior & Posterior) −1 50 (43) 34 (28) 30 (24)
  Index 49 (47) 35 (28) 30 (24)
1 41 (51) 33 (31) 25 (26)
2 17 (47) 27 (33) 11 (21)
Anterior Cruciate Ligamenta −2 36 (40) 14 (22) 23 (24)
  −1 44 (38) 32 (26) 27 (22)
Index 44 (42) 33 (27) 27 (22)
1 35 (44) 31 (28) 22 (23)
2 15 (42) 24 (29) 9 (17)
Posterior Cruciate Ligamenta −2 9 (10) 1 (2) 5 (5)
  −1 14 (12) 8 (6) 6 (5)
Index 13 (12) 8 (6) 6 (5)
1 12 (15) 7 (6) 6 (6)
2 6 (17) 8 (10) 3 (6)
Collateral Ligaments −2 22 (24) 6 (9) 12 (13)
(Medial & Lateral) −1 28 (24) 19 (15) 17 (14)
  Index 28 (26) 19 (15) 17 (14)
1 24 (30) 20 (18) 15 (15)
2 8 (22) 17 (20) 8 (15)
Medial Collateral Ligamenta −2 19 (21) 5 (8) 11 (11)
  −1 24 (11) 16 (13) 16 (13)
Index 24 (23) 16 (13) 16 (13)
1 23 (29) 17 (15) 14 (14)
2 8 (22) 14 (17) 8 (15)
Lateral Collateral Ligamenta −2 5 (5) 3 (5) 3 (3)
  −1 7 (6) 6 (5) 3 (2)
Index 7 (7) 6 (5) 3 (2)
1 4 (5) 6 (5) 2 (2)
2 2 (6) 6 (7) 0 (0)
Extensor Mechanism −2 40 (43) 26 (40) 21 (22)
  −1 50 (43) 48 (39) 30 (24)
Index 47 (45) 51 (41) 32 (26)
1 36 (46) 46 (42) 26 (27)
2 11 (31) 33 (39) 17 (32)
Proximal Gastrocnemius Tendon −2 46 (50) 25 (38) 39 (41)
  −1 54 (46) 54 (44) 51 (41)
Index 50 (47) 56 (45) 51 (41)
1 37 (46) 50 (45) 41 (42)
2 15 (42) 40 (48) 20 (38)
  1. aThe sum of the prevalence for each specific ligaments will not equal the overall cruciate or collateral ligament prevalence because some knees had anterior and posterior cruciate ligament degeneration or medial and lateral collateral ligament degeneration