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. Author manuscript; available in PMC: 2013 Jun 1.
Published in final edited form as: J Orthop Res. 2011 Nov 15;30(6):927–933. doi: 10.1002/jor.22008

Figure 2.

Figure 2

Sex-specific classification of pain-free controls (Ctrls) and PF pain (PFP) subjects into normal tracking and maltracking groups based on (A) patellar tilt and (B) bisect offset. The tilt and offset data were best fit with a 2-parameter Weibull model (solid lines, R2 ≥ 0.84). The values corresponding to the 75th percentile (horizontal dashed lines) were defined as the maltracking thresholds; a subject was classified as a maltracker if his/her tilt or offset value was greater than the sex-specific thresholds (vertical dashed lines).