Author, date and country | Patient group | Study type (level of evidence) | Outcomes | Key results | Study weaknesses |
---|---|---|---|---|---|
Houghton L and Driscoll P, UK, 1999 | 24 healthy volunteers. | Clinical trial | Percentage neck movement | Collars produced a reduction of movement of 31–45%. | Goniometric techniques can overestimate the actual cervical spine movement. |
Two different cervical collars with and without head blocks and straps. Movement was assessed using goniometric techniques. | Head blocks and straps produced a reduction of between 58–64%. | ||||
When head blocks and straps were in place the addition of a collar was not beneficial. |