Can strictures lead to CKD?

Yes. A stricture that blocks urine flow for long enough damages the kidney behind it, and that damage can become permanent chronic kidney disease.

The mechanism is straightforward. Urine backs up behind the blockage, pressure rises in the kidney, and the working units (nephrons) are lost. Once enough nephrons are gone, the surviving ones overwork to compensate, and that overwork drives scarring, low oxygen, inflammation, and further nephron loss in a self-perpetuating cycle [4]. Obstruction itself is a standard way to produce kidney scarring in animal models, which is how firmly established this pathway is [3]. In a feline transplant study, fibrous strictures blocked the ureter in 6 of 83 transplants, and the blocked kidneys showed impaired function until the obstruction was surgically relieved [2].

What the retrieved records show in humans is consistent with this. In patients with ureteroileal anastomotic strictures (scars where the ureter is sewn into a urinary diversion), kidney filtration rates were already reduced before treatment, in some cases severely, and relieving the stricture did not reliably restore lost function [1]. That is the key practical point: once filtration is lost, drainage fixes the plumbing but often not the kidney. Surgical series of stricture repair report good technical success, but they measure patency (whether the channel stays open), not recovered kidney function [5].

What this retrieval cannot see: no study here directly quantifies how likely a given stricture is to progress to CKD, or how fast, in an untreated population. That gap is about the search, not the literature. The general clinical consensus, outside these records, is that chronic obstruction is a recognized cause of CKD and that relief of obstruction before irreversible damage occurs is the goal.

My call: yes, strictures can cause CKD, and the damage is often not reversible once established, so obstruction should be treated promptly. Confidence: high on the mechanism, moderate on timing and reversibility, since the retrieved records lack direct human progression data.