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Fig. 2 | BMC Musculoskeletal Disorders

Fig. 2

From: Periarticular screws: what’s in and what’s out of the joint?

Fig. 2

An illustrative diagram summarizing the simplistic approach to placement of periarticular screws. (A) When a screw (arrow) is heading towards a concave articular surface (*), only one fluoroscopic view is needed to prove it is beneath the joint; this is exemplified by a screw down the anterior column of the acetabulum. (B) When a screw (arrow) is towards a convex articular surface (*), infinite fluoroscopic views must be obtained to prove it is beneath the joint. This is exemplified by a screw within the humeral head

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