Police were called to Fonteyn Court, in Hemlington, by paramedics on Monday (January) after a boy was found with a stab wound around 7.10pm.
The 17-year-old was taken to the James Cook University Hospital, in Middlesbrough, for a non-life-threatening injury and was later released.
Pictures seen by the Echo showed four police cars at the scene with blue lights flashing and an ambulance parked outside a property.
An air ambulance was also called to the scene, with paramedics arriving in a car before working alongside crews from the North East Ambulance Service.
Cleveland Police has now confirmed that a man, aged 20, has been arrested in connection with the incident and he remains in police custody at this time.
Inquiries remain ongoing.
A North East Ambulance Service spokesperson said: “We were called to an incident at a private address in Middlesbrough tonight (6 January) at 7:09pm.
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“We dispatched one ambulance crew, and one specialist paramedic and were supported by our colleagues at Great North Air Ambulance Service. One patient was taken to hospital for further treatment.”
A Great North Air Ambulance spokesperson added: “Our critical care team was activated at 7.22pm to an incident in Hemlington, Middlesbrough. We had two doctors and a paramedic respond on a critical care car and they arrived on scene at 7.31pm.
“Our team worked alongside the North East Ambulance Service (NEAS) to assess and treat a patient and they were taken to hospital by a NEAS road crew.”