Table 5 Incidence of ramp lesions in different arthroscopic observation studies
|  | Study type | Incidence (MRI) | Incidence (Arthroscopy) | Anterior view | Transcondylar notch view | PM portal view | Using 70° arthroscope |
|---|---|---|---|---|---|---|---|
Kim et al. [10] Liu et al. [3] Hatayama et al. [50] Sonnery-Cottet B et al. [14] Sonnery-Cottet et al. [5] Kim et al. [9] Peltier et al. [23] Dephillipo et al. [41] Dephillipo et al. [56] Okazaki et al. [54] Mouton et al. [20] Willinger et al. [44] Thaunat et al. [4] Seil et al. [1] Tashiro et al. [57] | Retrospective Retrospective Prospective Retrospective Prospective Prospective Prospective Prospective Retrospective Retrospective Prospective Retrospective Retrospective Retrospective Prospective | NR NR 22.6% (35/155) NR NR 21.5% (42/195) 43.6% (17/39) 8.0% (24/301) NR 34.9% (15/43) NR 9% (9/100) NR NR NR | 34.5% (95/275) 16.6% (144/868) 29.7% (46/155) 16.6% (50/302) 23.9% (769/3214) 26.6% (50/195) 58.9% (23/39) 16.6% (50/301) 18.6% (158/851) 37.2% (16/43) 21.1% (58/275) 16% (16/100) 15.5% (334/2156) 23.6% (53/224) 9.7% (10/103) | NR NR NR NR NR 9.7% 43.6% NR NR NR NR NR NR NR 0% | NR NR 29.7% 9.6% NR 12.3% 53.8% 16.6% NR 37.2% NR 16% NR NR 9.7% | 34.5% 16.6% NR 16.6% 23.9% 26.6% 58.9% NR 18.6% NR 21.1% NR 15.5% 23.6% NR | ( +) NR (–) (–) (–) ( +) (–) (–) NR (+) NR (–) NR (+) NR |