Pistoning
The unwanted vertical movement of a prosthesis relative to the residual limb during the swing phase of gait, indicating inadequate suspension.
Full Definition
Pistoning describes the axial reciprocating motion that occurs when a prosthetic socket loosens its grip on the residual limb, allowing the device to slide up and down with each step. This phenomenon is a primary indicator of suspension failure and can result in skin abrasion, blistering, reduced proprioception, and inefficient gait mechanics. Prosthetists assess pistoning clinically by observing socket-limb movement during walking or by using motion-capture tools. Editors should note that 'pistoning' functions as a gerund or present participle in clinical writing and is not hyphenated.
Usage
Usage note: Do not hyphenate 'pistoning.' Ensure context specifies the degree (e.g., mild, moderate, severe) when editing clinical outcome reports.
In Context
- "Excessive pistoning was documented during the gait analysis session, prompting a suspension system review." — Gait analysis report
- "The follow-up note described pistoning of approximately 1 cm during the swing phase, correlating with the patient's reported skin irritation." — Clinical follow-up documentation