Severity of pronation and classification of first metatarsophalangeal joint dorsiflexion increases the validity of the Hubscher Manoeuvre for the diagnosis of functional hallux limitus

摘要

Background: Functional hallux limitus (FHL) is diagnosed with a static test known as the Hubscher Manoeuvre, the validity of which has been previously questioned. Objectives: To investigate the validity of this Manoeuvre and whether introducing severity of pronation as a second concurrent test would increase this validity. Method: 30 participants with a hallux dorsiflexion <12° were divided into 2 equal groups, depending on their severity of pronation according to the Foot Posture Index. A single video camera, placed perpendicular to the plane of motion of the 1st MPJ, captured its movement, from which the angle of maximum dorsiflexion of this joint was measured. Results: 10 males and 20 females, aged 18-56 years (mean 28. yrs, SD ±12.1. yrs) participated. There was no significant relationship between non-weight bearing and dynamic maximum dorsiflexion (p= 0.160), and between weight bearing and dynamic maximum dorsiflexion (p= 0.865). A significant relationship between 1st MPJ dynamic maximum dorsiflexion and severity of pronation (p= 0.004) was found. Conclusions: None of the participants exhibited a complete lack of hallux dorsiflexion. A positive Hubscher Manoeuvre test, on its own, is not a good indicator of limited 1st MPJ dorsiflexion during dynamic motion. However, as pronation increases, 1st MPJ maximum dorsiflexion during gait decreases.