Tinnitus is a ‘ringing in the ears’ sound, which is sometimes associated with other injuries or dysfunctions, such as temporomandibular joint disorder (TMD) or cervical spine disorders (CSDs).
This systematic review with meta-analysis aimed to determine the correlation between severity of tinnitus symptoms with TMD or CSDs, and to see if there was a physiological explanation for these symptoms.
While this literature review shows that there can be a link between tinnitus and TMD in particular, why would this be? The authors highlight the structural links between the jaw joint and the inner ear.
It is speculated that the muscles associated with mastication may influence the inner ear canal through the tensor veli palatini, the eustachian tube, or several of the inner ear ligaments. It is hypothesised that these imbalances in muscle tension or TMJ mechanics can contribute to auditory symptoms.
While this study has several limitations such as a rather broad and subjective classification of TMD and CSDs, it does shed light on the mechanical link for addressing tinnitus. This is critical for further developing potential treatments for treating those who suffer from tinnitus.
> From: Bousema et al., Trends Hear 22 (2018) 2331216518800640 . All rights reserved to The Author(s). Click here for the online summary.
The function of the TMJ is often overlooked in the orthopaedic (and neurological) communities. While the joints in the cervical spine are able to produce a host of mechanical and neurological symptoms, the proximity of the TMJ to the auditory structures should also be strongly considered with any auditory or potential cranial neurological symptoms.
By better understanding how physiotherapy can address the TMJ and associated symptoms (not just pain, but headaches, tension, disrupted sleep and ofcourse tinnitus) enables physiotherapists to cross over between neurological and orthopaedic treatment as required to address several specific issues.