Presentation with respect to different levels involved
The presentation of cervical spondylosis varies with site of the lesion:
- most frequently affected intervertebral joint is C5/C6 - this characteristically causes loss in sensation over the thumb and a reduced biceps reflex. An inverted brachioradialis reflex may be present: there is a loss of the supinator reflex with finger flexion.
- C7/C8/T1 - loss of sensation over little finger, weakness of flexor carpi ulnaris
- C6/C7 - loss of sensation over middle finger, weakness of extension of elbow - triceps - and a reduced triceps reflex
- C4/C5 - loss of sensation over elbow, weakness of abduction of arm
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