Ulf Krister Hofmann1, Stefan Thumm2, Maurice Jordan3, Christian Walter4, Ina-Christine Rondak5, Ingmar Ipach6. 1. Department of Orthopedic Surgery, University Hospital of Tübingen, Hoppe-Seyler-Strasse 3, D-72076 Tübingen, Germany(∗). Electronic address: ulf.hofmann@med.uni-tuebingen.de. 2. Department of Orthopedic Surgery, University Hospital of Tübingen, Tübingen, Germany(†). 3. Department of Orthopedic Surgery, University Hospital of Tübingen, Tübingen, Germany(‡). 4. Department of Orthopedic Surgery, University Hospital of Tübingen, Tübingen, Germany(§). 5. Institute for Medical Statistics and Epidemiology, University Hospital of the Technical University of Munich, Munich, Germany(¶). 6. Department of Orthopedic Surgery, University Hospital of Tübingen, Tübingen, Germany(#).
Abstract
BACKGROUND: Although a person's fitness to drive has gained more attention over the past few years, investigations have focused mainly on postsurgical (eg, hip arthroplasty) driving performance. Few data are available on how orthoses affect the ability to perform an emergency stop. OBJECTIVE: To determine whether common lumbar and hip orthoses impair driving performance by increasing brake response time and weakening brake force (BF). DESIGN: Crossover repeated measures design. SETTING:University hospital. PARTICIPANTS: A crossover, repeated-measures design was used to test 30 healthy volunteers with and without each of the orthoses in random order. METHODS: A custom-made simulator was created from a car cabin fitted with measurement equipment to record braking parameters under realistic spatial constraints. MAIN OUTCOME MEASUREMENTS: Reaction time (RT), foot transfer time (FTT) (these 2 together: brake response time), and maximum BF. RESULTS: Although spine orthoses lead to statistically significant increases in RT (Vertebradyn-Strong, P = .002; Horizon 637 LSO, P = .32; and SofTec Dorso, P = .013), this effect was not observed in hip orthoses, where instead FTT was prolonged (DynaCox and Hohmann-like orthosis, P < .001). BF was not significantly altered in any of the orthoses. CONCLUSIONS: This study demonstrates that hip and spine orthoses lead to impaired driving performance. Depending on the type of immobilization, this effect mostly increases RT or FTT, lengthening total stopping distances by up to half a meter at 100 km/h. However, in the absence of an underlying pathological condition in individuals with orthoses, their braking performance should be sufficient to continue driving.
RCT Entities:
BACKGROUND: Although a person's fitness to drive has gained more attention over the past few years, investigations have focused mainly on postsurgical (eg, hip arthroplasty) driving performance. Few data are available on how orthoses affect the ability to perform an emergency stop. OBJECTIVE: To determine whether common lumbar and hip orthoses impair driving performance by increasing brake response time and weakening brake force (BF). DESIGN: Crossover repeated measures design. SETTING: University hospital. PARTICIPANTS: A crossover, repeated-measures design was used to test 30 healthy volunteers with and without each of the orthoses in random order. METHODS: A custom-made simulator was created from a car cabin fitted with measurement equipment to record braking parameters under realistic spatial constraints. MAIN OUTCOME MEASUREMENTS: Reaction time (RT), foot transfer time (FTT) (these 2 together: brake response time), and maximum BF. RESULTS: Although spine orthoses lead to statistically significant increases in RT (Vertebradyn-Strong, P = .002; Horizon 637 LSO, P = .32; and SofTec Dorso, P = .013), this effect was not observed in hip orthoses, where instead FTT was prolonged (DynaCox and Hohmann-like orthosis, P < .001). BF was not significantly altered in any of the orthoses. CONCLUSIONS: This study demonstrates that hip and spine orthoses lead to impaired driving performance. Depending on the type of immobilization, this effect mostly increases RT or FTT, lengthening total stopping distances by up to half a meter at 100 km/h. However, in the absence of an underlying pathological condition in individuals with orthoses, their braking performance should be sufficient to continue driving.
Authors: Jakob Rodseth; Edward P Washabaugh; Ali Al Haddad; Paula Kartje; Denise G Tate; Chandramouli Krishnan Journal: Appl Ergon Date: 2017-07-29 Impact factor: 3.661
Authors: D Latz; E Schiffner; J Schneppendahl; B H Thalmann; P Jungbluth; J Grassmann; J Windolf; S V Gehrmann Journal: Unfallchirurg Date: 2019-09 Impact factor: 1.000