Table 4: Risk of Bias in Included Studies

AU Adequate Sequence Generation? A C Blinding? Patient-Reported Outcomes Blinding? Incomplete Outcome Data Adressed? Short Term Outcomes?
Savolainen Yes.1. Probably done No No No 96% clinical FU 4y; 78% radiologic FU.
Xie-Hulbert Yes.2. Probably done No Two out of all outcomes are pts derived outcome No 93% clinical FU 2y
Van der bent yes.3. Probably done No pts using semianalogue scale No 91% radiologic FU ; 96% clinical FU
Hauerberg Yes. 4. Probably done No No No 89% 24m clinical FU
Oktenoglu 5. Quasi-randomised No No?-Blind analysis et end. 100% 18m clinical FU
Rosenorn yes. 6. Probably done No No 95% 12 M clinical FU
Martins Yes. 7. Probably done No No No 45% 1 Y clinical FU
Barlocher Yes.8. Probaly done No Only Radiographs were reviwed by independent radiologist. No 98,5% 1 y FU

AC: Allocation Concealment.1. Randomization was conducted after the selection of the surgeon;2: computer generation matrix;3: a block restricted method using sealed envelopes. 4:150 codes generated by computer;5:quasi-randomised(head or tail-coin);6:described as randomized; 7:described as “lottery style”;8:Described as randomized.