insertábamos
-we were inserting
The word insertábamos is the imperfect form of insertar in the first person plural.
See the full insertar conjugation

insertar

Y luego esa plantilla de regeneración la insertábamos dentro del cartílago del menisco faltante para regenerarla en la rodilla del paciente.
We would then take that regeneration template and insert it into the missing meniscus cartilage to regrow that in a patient's knee.
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