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Orthopaedic Proceedings
Vol. 94-B, Issue SUPP_XXXVII | Pages 549 - 549
1 Sep 2012
Pengas I Pillai A Gayed W Assiotis A Mcnicholas M
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The patella is a complex sesamoid bone within the quadriceps enhancing mechanical advantage of the extensor mechanism. Depending on activity, the patella magnifies either force or displacement; behaving as a lever, by redirecting quadriceps force it also acts as a pulley.

Aim

We describe and validate a device for obtaining consistent dynamic weight bearing views of the patellofemoral joint (PFJ).

Materials and Methods

Weight bearing (WB) axial views of 48 knees (24 patients) were performed using the device. The sulcus angle (SA), congruence angle (CA), lateral patellofemoral angle (LPFA), facet angle (FA) and patellofemoral displacement (PD) were measured. These were compared with similar measurements made on prone (PR) and axial (AX) radiographs of same knees.