How ROSI differs from conventional ICSI
ICSI involves injecting a sperm cell into an egg. ROSI instead uses a round spermatid from an earlier developmental stage. These cells must be identified accurately: not every round cell is a spermatid. The procedure cannot replace cells that are absent.
When might it be discussed?
Specialist discussion may be relevant when mature sperm cannot be retrieved but usable round spermatids are identified. Azoospermia or an unsuccessful Micro-TESE alone is not sufficient for eligibility. The female partner’s reproductive assessment is also part of planning.
Evidence and uncertainty
Scientific publications report live births after ROSI. However, it should not be presented as an established equivalent to routine ICSI; evidence on effectiveness and long-term safety remains limited. Results from a small research study are not a personal pregnancy prediction or a hospital’s success rate.
Preparing to discuss A Life’s information
A Life Health Group explains ROSI on its website. Clarify individual eligibility, the proposed technique, any applicable research or authorisation framework and the informed-consent process directly with the centre. Piezo-assisted mechanical injection and oocyte activation are different concepts; ask which procedures are actually proposed.
Frequently asked questions
Does ROSI guarantee pregnancy?
No. Fertilisation, embryo development, pregnancy and live birth are different outcomes, and none can be guaranteed.
How should I interpret a quoted success rate?
Ask whether it describes fertilisation, pregnancy or live birth, which patient group it comes from and how many treatment attempts are included. These measures are not interchangeable.
Sources
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