Table 2. Quality assessment and characteristics of included studies.

JBI = Joana Briggs Institute score, PRP = Platelet-rich plasma, n = Number, Vs = Versus, wk = Weeks, mo = Months, mg = Milligrams

Number	Study, year	Country	Period	Study design	Mean JBI	Sample size	Randomization	Demographics	Comparison or control group	Dose & frequency of PRP	follow up
1	El sheik et al., 2020 [23]	Egypt	2020	Prospective experimental comparative study	7.5/9	n = 40	Not randomized	Males=4, Females=31	corticosteroid comparison group	1mL of betamethasone injected once Vs 1.5mL of PRP, injected once.	Pre injection, 1mo, 6mo
2	Kumar et al., 2023 [24]	India	2022	Prospective randomized rxperimental comparative study	8/9	n = 60	Randomized	Unclear	corticosteroid comparison group	3mL of PRP injected once Vs 1mL of methylprednisolone injected once.	Pre injection, 1mo, 3mo, 6mo, 1 year
3	Gulati et al., 2022 [25]	India	September 2020 to September 2022	Prospective randomized experimental comparative study	8/9	n = 40	Randomized	Males =21, Females = 13 Right hand = 29, Left hand = 15	corticosteroid comparison group	3-4mL of PRP injected 3 times (0,4wk, 8wk) Vs 40mg of triamcinolone injected 3 times (0,4wk, 8wk).	Pre injection, 4wk, 12thwk, 24thwk.
4	Giroti et al., 2021 [26]	India	February 2018 to June 2019	Prospective experimental comparative study	6.5/9	n = 50	Not randomized	Males = 5, Females = 42	corticosteroid comparison group	1mL of methylprednisolone with 1mL of 0.5% Bupivacaine injected once Vs 3-4mL of PRP, injected once.	Pre injection, 1mo, 6mo
5	Shoma et al., 2023 [27]	Bangladesh	2022	Randomized clinical trial	7/13	n = 100	Randomized	Males = 28, Females = 66 Right hand = 62, Left hand = 32R	PRP vs corticosteroids vs conservative management	3mL of PRP injected once, 40mg of triamcinolone injected once	Pre injection, 1mo, 3mo, 6mo
6	Rahman et al., 2023 [28]	Bangladesh	March 2020 to February 2021	Randomized clinical trial	6/13	n = 54	Randomized	Males = 9, Females = 42, Right hand = 23, Left hand = 18	PRP vs conservative management	3mL of PRP injected once	Pre injection, 1mo, 3mo, 6mo
7	Lu et al., 2017 [29]	China	July 2014 to March 2015	Randomized Controlled trial	7.5/13	n = 52	Randomized	Males = 14 Females = 37	surgery alone Vs Surgery and PRP	3mL of PRP injected once with surgery	Pre injection, 3mo, 6mo, 12mo
8	Asaad et al., 2023 [30]	Iraq	January 2020 to February 2021	Prospective experimental study	5/9	n = 12	Not randomized	Males = 0, Females = 12 8 affecting dominant hand, 4 affecting non dominant hand	no control or comparison group	2mL of PRP, injected once.	Pre injection, 1wk, 1mo, 3mo