Dias 2004.

Methods	RCT; matched design in patients with bilateral CTS. Lengthening of the flexor retinaculum was randomly allocated to one hand; the other was treated with OCTR in the same session.
Participants	Mean age 56 (23 to 84) years. 73% female. Electrophysiologically confirmed CTS, both idiopathic and secondary CTS. All patients treated bilaterally.
Interventions	(1) OCTR with lengthening of the flexor retinaculum (26 hands). (2) OCTR (26 hands).
Outcomes	Symptom severity score. Functional status score. Grip and pinch strength. Scar tenderness. Complications.
Notes
Risk of bias
Bias	Authors' judgement	Support for judgement
Allocation concealment (selection bias)	Low risk	A ‐ Adequate