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Fig. 2 | Journal of Experimental Orthopaedics

Fig. 2

From: Flexion First Balancer: description of new technique in TKA to reproduce joint line and pre-disease mechanical alignment

Fig. 2

Differences in medial posterior condylar offset between conventional posterior reference technique and Flexion First Balancer technique. These figures show the differences in posterior condylar offset between conventional posterior referenced TKA systems (a) and the Flexion First Balancer (b). Both systems are set in 3° of exo-rotation for the posterior condyles (parallel to the trans-epicondylar axis). However, standard systems use a central pivot point and therefore averages the medial and lateral posterior condylar offset (PCO). As a result the medial PCO is not fully restored and this potentially leads to mid-flexion instability. The Flexion First Balancer technique pivots medially and thereby fully restores the medial PCO. The numbers in the bottom indicate the amount of resected bone from the medial and lateral PCO

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