ArticleEuropean journal of orthopaedic surgery & traumatology : orthopedie traumatologie2026
The effect of gap and step-off displacement of infratectal T-type acetabular fractures on contact pressures of the acetabulum: a biomechanical analysis.
Article in European journal of orthopaedic surgery & traumatology : orthopedie traumatologie, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
purposeTo determine the effect of gap and step-off displacement of infratectal T-type acetabular fractures in a biomechanical model and understand the effects of displacement on acetabular joint pressures when the fracture lies outside of the weight-bearing dome.
methodsInfratectal T-type acetabular fractures were created with osteotomies in cadaveric acetabuli and the hip joints were assembled in a servohydraulic test frame. Intra-articular pressure sensors were used to measure contact area, contact pressure, and peak forces through increasing gap and step-off displacement during simulated positions of standing, walking, and stair climbing.
resultsWith 0 mm articular step-off and increasing gap from 0 mm to 5 mm, there was no significant change in contact area, contact pressure, or peak force throughout most testing conditions. With a 2 mm step-off, contact area (-5.9 ± 1.8cm
conclusionThis biomechanical study suggests that hip conditions are not significantly altered in T-type acetabular fractures outside the weight-bearing dome when there is an articular gap but no step-off and when there is an articular step-off and a gap of 2 mm or less. Infratectal T-type acetabular fractures with a combination of 2 mm articular step-off and gap greater than 5 mm may benefit from surgical reduction as malunion may lead to increased contact pressures within the joint.
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