P
Pridie drilling
Pridie drilling is a now defunct cartilage repair procedure that paved the way for microfracture and nanofracture.
Pridie procedure
The Pridie Procedure is a procedure from the 1980s, where damaged joint surface is drilled with a fine drill, to enable stem cells to migrate from the bone marrow underneath and to cover the surface with new fibrocartilage cells.
Primary care physician
A primary care physician is the family doctor.
Primary Repair
A primary repair is a term used in knee surgery, where a structure (eg ligament, meniscus) is repaired rather than reconstructed.
Primary varus
Primary varus are bow legs that the person was simply born with.
Prodrome
The prodrome is the early phase of a medical problem, before the incident is fully apparent but early symptoms have started.
Progenitor cell
A progenitor cell is a stem cell that is already partially differentiated. A stem cell can multiply an infinite number of times, but a progenitor cell can only multiply a certain number of times.
Progenitor cells
Progenitor cells are stem cells that are already partially differentiated.
Prolotherapy
Prolotherapy is the injection of an irritant, usually dextrose, into disturbed soft tissues such as tendons and fascia in an effort to stimulate self regeneration with new cells.
PROM
PROM is an abbreviation for 'Passive Range-of-Motion', which is the range of motion your knee can achieve when someone moves it for you. [The abbreviation can also be used for 'patient-reported outcome measure' - but that is usually given as a plural - ie PROMS.] Page updated April 2024 by Dr Sheila Strover (Clinical Editor)