Associations of foot and ankle characteristics with knee symptoms and function in individuals with patellofemoral osteoarthritis

Tan, Jade M.; Crossley, Kay M.; Munteanu, Shannon E.; Collins, Natalie J.; Hart, Harvi F.; Donnar, Joel W.; Cleary, Gearoid; O’Sullivan, Isobel C.; Maclachlan, Liam R.; Derham, Catherine L.; Menz, Hylton B.

doi:10.1186/s13047-020-00426-8

Journal of Foot and Ankle Research

Table 2 Univariate statistical analyses of associations between foot and ankle characteristics with knee symptoms and function

From: Associations of foot and ankle characteristics with knee symptoms and function in individuals with patellofemoral osteoarthritis

	Weightbearing ankle dorsiflexion range of motion			Foot Posture Index (FPI)			Foot mobility
							Arch Height Difference^			Midfoot Width Difference^			Foot Mobility Magnitude
	Correlation	R²	p value	Correlation	R²	p value	Correlation	R²	p value	Correlation	R²	p value	Correlation	R²	p value
Knee pain provocation tests:
Repeated single step-ups	0.136	0.018	0.070	− 0.183	− 0.033	0.021*	− 0.094	− 0.009	0.212	− 0.133	− 0.018	0.076	− 0.201	− 0.040	0.007*
Repeated double-leg sit-to-stand	0.125	0.016	0.135	−0.202	− 0.041	0.021*	− 0.045	− 0.002	0.591	− 0.096	− 0.009	0.267	− 0.170	− 0.029	0.043*
Patient-reported measures of knee symptoms and function:
Average knee pain	−0.277	− 0.077	< 0.001*	− 0.059	− 0.003	0.461	0.036	0.001	0.628	−0.053	− 0.003	0.482	0.030	0.001	0.693
Worst knee pain	−0.140	−0.020	0.059	−0.035	− 0.001	0.664	0.037	0.001	0.625	−0.057	−0.003	0.444	0.019	0.000	0.799
Max knee pain during stair ambulation	−0.173	−0.030	0.020*	−0.007	− 0.000	0.932	0.008	0.000	0.920	0.047	0.002	0.534	0.040	0.002	0.596
Max knee pain during squatting	−0.059	−0.003	0.433	0.039	0.002	0.629	0.133	0.018	0.078	0.146	0.021	0.052	0.105	0.011	0.163
Max knee pain rising from sitting	−0.073	−0.005	0.331	0.002	0.000	0.979	0.068	0.005	0.366	0.001	0.000	0.988	0.064	0.004	0.398
AKPS	0.159	0.025	0.032*	−0.124	−0.015	0.118	−0.124	− 0.015	0.098	− 0.037	−0.001	0.626	−0.116	− 0.013	0.123
KOOS-symptoms	0.062	0.004	0.405	0.052	0.003	0.517	−0.045	− 0.002	0.547	0.108	0.012	0.150	−0.039	−0.002	0.603
KOOS-pain	0.074	0.005	0.319	0.093	0.009	0.241	−0.057	−0.003	0.449	0.077	0.006	0.304	−0.039	−0.002	0.600
KOOS-ADL	0.091	0.008	0.223	0.082	0.007	0.300	−0.095	−0.009	0.205	0.066	0.004	0.381	−0.091	−0.008	0.225
KOO-sport/rec	0.058	0.003	0.441	0.032	0.001	0.690	−0.011	−0.000	0.883	0.000	0.000	0.996	−0.018	−0.000	0.807
KOOS-QoL	0.084	0.007	0.262	0.078	0.006	0.326	0.042	0.002	0.572	0.003	0.000	0.964	0.019	0.000	0.802
KOOS-PF	0.048	0.002	0.522	0.026	0.001	0.746	0.042	0.002	0.579	−0.006	−0.000	0.941	0.009	0.000	0.905

*p ≤ 0.05
^ data not normally distributed and presented as Spearman’s Rho
mm: millimetres (0 mm = no pain; 100 mm = worst pain possible); AKPS: Anterior Knee Pain Scale (0 = maximal disability; 100 = no disability); KOOS: Knee injury and Osteoarthritis Outcome Score; (0 = extreme knee problems; 100 = no knee problems), ADL: activities of daily living; sport/rec: sport and recreation; QoL: quality of life; PF: patellofemoral

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ISSN: 1757-1146

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