Article

Earlier studies have suggested that the hip extension
angle and the hip flexor moment in walking are affected by hip dysplasia, but to
our knowledge there have been no reports on running or evaluations of
self-reported health. We evaluated differences in walking, running, and
self-reported health between young adults with symptomatic hip dysplasia and
healthy controls. METHODS: Walking and running in 32 patients with
hip dysplasia, mean 34 (18-53) years old, was compared with walking and running
in 32 controls, mean 33 (18-54) years old. Joint kinematics and
kinetics-quantified by the peak hip extension angle and the peak net joint moment
of hip flexion during walking and running-were recorded using a motion-capture
system, and health was evaluated using the Copenhagen Hip and Groin Outcome Score
(HAGOS). RESULTS: The peak hip extension angle during walking was less in the
patients than in the controls (-10.4 (SD 4.8) degrees vs. -13.2 (SD 4.5) degrees;
p = 0.02). Similarly, the peak net joint moment of hip flexion during walking was
lower in the patients than in the controls (0.57 (SD 0.13) N*m/kg vs. 0.70 (SD
0.22) N*m/kg; p = 0.008). In all dimensions of HAGOS, the patients scored lower
than the controls. Furthermore, the hip extension angle and the net joint moment
of hip flexion correlated with the HAGOS subscales pain and physical function in
sport and recreation. INTERPRETATION: Patients with symptomatic hip dysplasia do
modify walking and running, and we therefore suggest that the impairment found in
this study should play an important role in the evaluation of later operative and
training interventions.

Langue : ANGLAIS