A novel method to assess intraarticular screw penetration into the joint space

OBJECTIVESThis study aims to propose a novel method to detect articular penetration of screws by relying on their electrical conductivity properties and control the validity of this method. MATERIALS AND METHODSIn this ex vivo study, conducted between June 2017 and August 2017, we used five fresh sheep shoulder joints. First, the shoulder joint space was filled with saline solution. An insulated cannula was placed in the joint capsule, and a conductive wire was introduced into the joint via this cannula. A single titanium screw was inserted from the tuberculum majus into the posteroinferior quadrant of the humeral head under fluoroscopic observation. Conductivity was continuously measured using a digital multimeter. When a sudden decrease in conduction resistance was detected, fluoroscopic images were obtained in the anteroposterior (AP) and lateral directions. These images were assessed for penetration by a blinded surgeon. Penetration was confirmed by dissection of the joint. RESULTSThere was a significant decrease in electrical resistance when screw penetration occurred (p