I'll try to get more references later but here is one I especially like:
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1: Pain Res Manag. 2002 Summer;7(2):81-92.Links

Comment in:
Pain Res Manag. 2002 Winter;7(4):212.
Pain Res Manag. 2002 Winter;7(4):212; author reply 212.

Central hyperexcitability in chronic musculoskeletal pain: a conceptual breakthrough with multiple clinical implications.
Lidbeck J.

Pain Management Clinic, Hospital of Helsingborg, Helsingborg, Sweden. jan.lidbeck@helsingborgslasarett.se

Recent investigations of dysfunctional pain processing in the central nervous system have contributed much knowledge about the development of chronic musculoskeletal pain. Many common chronic musculoskeletal pain syndromes - including regional myofascial pain syndromes, whiplash pain syndromes, refractory work-related neck-shoulder pain, certain types of chronic low back pain, fibromyalgia and others - may essentially be explained by abnormalities in central pain modulation. The growing awareness of dysfunctional central pain modulation may be a conceptual breakthrough leading to a better understanding of common chronic pain disorders. A new paradigm will have multiple clinical implications, including re-evaluation of clinical practice routines and rehabilitation methods, and will focus on controversial issues of medicolegal concern. The concept of dysfunctional central pain processing will also necessitate a mechanism-based classification of pain for the selection of individual treatment and rehabilitation programs for subgroups of patients with chronic musculoskeletal pain due to different pathophysiological mechanisms.

PMID: 12185372 [PubMed - indexed for MEDLINE]

You can get it if you have a good university library nearby. Otherwise you can download it from the publisher's site but
it's somewhat expensive ($20, I think)

http://www.pulsus.com/journals/toc.j...Ky=7&isuKy=543