“…There were four case-cohort UPCTR studies [ 17 , 70 , 71 , 72 ]: one compared UPCTR with mini-OCTR [ 17 ]; one investigated UPCTR vs. OCTR [ 72 ]; one evaluated UPCTR using a 22 G hypodermic needle vs. UPCTR plus corticosteroid injection [ 70 ]; and the last case-cohort study compared the use of a UPCTR of an uncoated multifilament stainless steel wire looped thread with no interventions [ 71 ]. Among 16 case series [ 76 , 77 , 78 , 79 , 80 , 81 , 82 , 83 , 84 , 85 , 86 , 87 , 88 , 89 , 90 , 91 ], six investigated the effects of different hook knives [ 76 , 79 , 81 , 82 , 87 , 89 ], five evaluated the use of microknives [ 80 , 83 , 85 , 86 , 88 ], two analyzed loop threads [ 77 , 78 ], one assessed a microblade [ 84 ], and one investigated an 18 G needle with a tip bent in the opposite direction to the needle bevel [ 90 ].…”