Because of increased within-subject variability in vertical toe clearance when wearing multifocal spectacles, elderly individuals may be at greater risk of falling when negotiating steps and stairs if they do not also consistently increase margins of safety (mean vertical toe clearance). This suggests that some elderly who are at high risk of falling may benefit from wearing single-distance vision rather than multifocal spectacles when walking.

These results suggest that when using the Modified RMI to assess patients in the early stages following stroke, similar results can be obtained by different raters, regardless of experience. However there needs to be a difference of more than 4.5 points (degree of measurement error at 95% confidence level) in the overall score to detect true changes in the patient's level of mobility.

Background Focus of attention is known to play an important role in motor skill learning, yet little is known about how attention is directed within the context of stroke rehabilitation. Objective The aims of this study were: (1) to identify physical therapists' use of internal and external focus of attention during gait rehabilitation for individuals with hemiplegia following stroke and (2) to use the findings to design an experimental study examining the impact of focus of attention on learning poststroke. Design The study design involved direct nonparticipation observation of physical therapy treatment sessions. Methods Eight physical therapy treatment sessions, in which gait rehabilitation was taking place, were video recorded. Patients were aged between 36 and 85 years, and ranged from 7 to 216 days poststroke; physical therapists had between 3 and 12 years of experience in stroke rehabilitation. Data analysis took 2 forms: (1) clear definitions of internal and external focus of attention were agreed on via a consensus group and used to develop an analysis matrix through which incidences of instruction and feedback were identified, categorized, and counted; and (2) verbal dialogue was transcribed verbatim and transcripts were thematically analyzed to provide a detailed description of how instructions and feedback were used, illustrated by examples. Results The use of instructions and feedback (internal and external focus) was high; an average of one verbal instruction or feedback statement was delivered every 14 seconds. Sixty-seven percent of the statements were internally focused, 22% were externally focused, and 11% were of mixed focus. Unfocused statements (eg, “good”) also were used regularly. Patients were frequently encouraged to “think about” their performance. Limitations Observational data collection methods may result in changes in the behavior of those observed, which is a potential source of bias. The small sample size also was a limitation of the study. Conclusion Physical therapists frequently encouraged patients to be aware of their movements and their performance (internal focus). This approach may reduce automaticity and hinder learning and retention.

Abstract-Most clinically available prosthetic feet have a rigid attachment or incorporate an "ankle" device allowing elastic articulation during stance, with the foot returning to a "neutral" position at toe-off. We investigated whether using a foot with a hydraulically controlled articulating ankle that allows the foot to be relatively dorsiflexed at toe-off and throughout swing would increase minimum toe clearance (MTC). Twenty-one people with unilateral transtibial amputation completed overground walking trials using their habitual prosthetic foot with rigid or elastic articulating attachment and a foot with a hydraulic ankle attachment (hyA-F). MTC and other kinematic variables were assessed across multiple trials. When using the hyA-F, mean MTC increased on both limbs (p = 0.03). On the prosthetic limb this was partly due to the device being in its fully dorsiflexed position at toe-off, which reduced the "toes down" foot angle throughout swing (p = 0.01). Walking speed also increased when using the hyA-F (p = 0.001) and was associated with greater swing-limb hip flexion on the prosthetic side (p = 0.04), which may have contributed to the increase in mean MTC. Variability in MTC increased on the prosthetic side when using the hyA-F (p = 0.03), but this did not increase risk of tripping.

Background. Disruptions to the progress of the centre-ofpressure trajectory beneath prosthetic feet have been reported previously. These disruptions reflect how body weight is transferred over the prosthetic limb and are governed by the compliance of the prosthetic foot device and its ability to simulate ankle function. This study investigated whether using an articulating hydraulic ankle attachment attenuates centre-of-pressure trajectory fluctuations under the prosthetic foot compared to a fixed attachment. Methods. Twenty active unilateral trans-tibial amputees completed walking trials at their freely-selected, comfortable walking speed using both their habitual foot with either a rigid or elastic articulating attachment and a foot with a hydraulic ankle attachment. Centre-ofpressure displacement and velocity fluctuations beneath the prosthetic foot, prosthetic shank angular velocity during stance, and walking speed were compared between foot conditions. Findings. Use of the hydraulic device eliminated or reduced the magnitude of posteriorly directed centre-of-pressure displacements, reduced centreof-pressure velocity variability across single-support, increased mean forwards angular velocity of the shank during early stance, and increased freely chosen comfortable walking speed (p ≤ 0.002).Interpretation. The attenuation of centre-of-pressure trajectory fluctuations when using the hydraulic device indicated bodyweight was transferred onto the prosthetic limb in a smoother, less faltering manner which allowed the centre of mass to translate more quickly over the foot. *Conflict of InterestThe authors declare that there are no conflicts of interests. Background. Disruptions to the progress of the centre-of-pressure trajectory beneath