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Enthesopathy of Rheumatoid and Ankylosing Spondylitis

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Enthesopathy of Rheumatoid and Ankylosing Spondylitis Ann. rheum. Dis. (1971), 30, 213 Ann Rheum Dis: first published as 10.1136/ard.30.3.213 on 1 May 1971. Downloaded from The Heberden Oration, 1970 Enthesopathy of rheumatoid and ankylosing spondylitis JOHN BALL Rheumatism Research Centre, University of Manchester. The invitation to speak before the Heberden Society responsible for the differential susceptibility of on this annual occasion is a great honour. For me it these joints to ankylosis remains obscure. And if, as was also a stimulus to assemble some thoughts Engfeldt, Romanus, and Yden (1954) and Bywaters and observations on spondylitis-a subject in which (1967, 1969) have indicated, ossification of inter- my colleagues and I have been interested for some vertebral discs in AS is inflammatory in origin, we time. may ask why similar lesions do not occur in rheu- It has always seemed to me very odd that whilst matoid spondylitis (RS). Thus, we seem to lack a rheumatoid arthritis (RA) and ankylosing spondylitis clear morphological explanation for the obvious (AS) canbe distinguished onclinical, epidemiological, differences in the evolution of the two main forms of genetic, immunological, and even therapeutic spondylitis: RS is characterized by instability, grounds, an acceptable pathological differentiation AS by progressive ossification. has yet to emerge. Indeed, histological studies often In an attempt to gain some insight into this emphasize the similarities rather than explain the problem of the differential pathology, I shall differences. The synovial reaction appears to be the first discuss the nature of RS and then consider the same in both (Julkunen, 1966); and Cruickshank morphogenesis of progressive ossification in AS. (1951) has said that one can match all stages in What I have to say is largely based on a personal diarthrodial joints in RA and AS, which is to an study of post-mortem material, and a small but http://ard.bmj.com/ extent true but nevertheless does not help us to important group of biopsy specimens in AS. Table I understand, for instance, the obvious difference in shows the total number of necropsies in RA and AS the behaviour of the diarthrodial sacroiliac joints. and the number of cases in each group in which We have also been repeatedly told (Guntz, 1933; various parts of the axial skeleton have been Freund, 1942; Geiler, 1969) that spinal apophyseal examined; and secondly the origin and number of arthritis is common to both; but the mechanisms biopsy specimens in AS. on October 1, 2021 by guest. Protected copyright. Table I Material available for study Source Diagnosis Total Material of cases material Spine Sacroiliac Manubrio- *joints sternal joints Cervical Thoracic Lumbar Necropsy AS 13 10 5 9 8 8 RA 119 55 4 13 7 17 Biopsy AS 13 Ligamentous 5 Iliac crest 3 attachments Greater trochanter 1 Patella 1 Capsular 4 Knee 4 ligaments Intevertebral 4 Thoracic 1 discs Lumbar 3 214 Annals of the Rheumatic Diseases Ann Rheum Dis: first published as 10.1136/ard.30.3.213 on 1 May 1971. Downloaded from I will begin with a few words about ligamentous and as I hope to show, involves ligamentous attach- attachments since they figure prominently in the ments. discussion and have generally received less attention than most other articular components. A ligamentous attachment to bone-an enthesis-presents a char- acteristic structural sequence. Just before reaching Rheumatoid spondylitis (RS) the bone the fibre bundles of the ligament become It has recently become widely recognized that more compact, then cartilaginous and then calcified spondylitis in RA is a common cause of disability before beingjoined to the bone by a cement line (Plate which manifests itself mainly in the cervical region 1(a)). An abnormnality in this area may be called an in the form of instability and sometinxs severe enthesopathy-a word I first met in a publication by dislocation (Ball and Sharp, 1971). Cervical in- our colleagues in Piestany (Niepel, Kostka, Kopecky, stability and dislocation are associated with erosive and Manca 1966). The cartilaginous zone may be arthritis of the apophyseal joints, and destructive prominent or inconspicuous, and there is consider- lesions of the corresponding disc. But whereas able variation in the depth of the calcified zone. apophyseal arthritis may occur at any level in the Capillary-like vessels may be seen close to the bone spine, dislocation is virtually confined to the cervical and in some sites may pass through the enthesis region. Thus, to begin to understand the patho- to the marrow or to haversian canals. Histologically genesis of RS, we need to explain the origin and the vessels seem to be very scanty, but the studies of localization of the cervical disc lesion, and the Peacock (1959) with labelled phosphorus and the nature of the thoracic and lumbar disc lesions that injected specimens of Rathbun and Macnab (1970) are occasionally seen. These problems were initially indicate that the potential vascular bed is larger than approached by examining fourteen rheumatoid histological sections suggest. The annulus fibrosus cervical spines in which there was little or no radio- of the intervertebral disc is a notable exception to logical evidence of disease along with twelve non- the rule, for it is generally held that all but its arthritic controls (Ball, 1958). In all but one of the outer fibres are avascular. Little is known of the rheumatoid cases small macroscopic reddish lesions metabolism of an enthesis, and even less of its were found in one or more discs but not in the biochemistry. However, it is evident from the common ligaments or ligamenta flava. The lesions ultrastructural studies of Cooper and Misol (1970) were always most pronounced in the lateral margins that the cells in both calcified and uncalcified zones of the disc, and in some cases were confined to this are viable. Moreover, the late Professor D. V. region. (Similar lesions were not observed in many years ago that in immature subsequent studies of four cases of AS in which Davies showed http://ard.bmj.com/ animals injected with labelled sulphate radioactivity there was little or no radiological evidence of was greater at the osseous attachment than else- disease.) Histologically, these disc lesions were where in a ligament (Davies and Young, 1954). found to be related to neurocentral (NC) joints I have observed a similar localization in young rats (Fig. IA and B). NC joints are formed by a cleft in injected with radioactive calcium instead of labelled the lateral margin of the disc which lies between the sulphate, the label in this case being especially lower lateral border of the vertebral body above and concentrated in a narrow band, probably at the the NC lip of the subjacent vertebra. The cleft is junction of the calcified and uncalcified zones covered laterally by a fibrous membrane lined by on October 1, 2021 by guest. Protected copyright. (Plate 1(b)). It would seem therefore that an enthesis synovium. According to Ecklin (1960), NC joints is a metabolically active site, at least during grovyth- are not present at birth and their appearance a point of possible significance since AS often b8gins depends on the development of the NC lip which is in adolescence and early adult life (Wood, 1968), not completed until about the age of 20 years. Like PLATE l(a) A healthy enthesis; from below upwards, PLATE 1(e) Anterior surface of patella. Inflammatory bone, calcified zone, cartilaginous zone, and compact cells concentrated in centre oferosive lesion ofligamentous ligament. Haematoxylin and eosin. x 150 attachment. Haematoxylin and eosin. x 60 trochanter. a normal enthesis in a PLATE l(f) Greater Lymphocytes, plasma PLATE l(b) Autoradiograph of and in erosive lesion young rat injected with "Ca. Radioactivity (black grains) cells, polymorphonuclear leucocytes enthesis between below and ofligamentous attachment. Haematoxylin andeosin. x 150 is concentrated in the ligament PLATE 1(g) Greater trochanter. Edge of erosive lesion bone above. Toluidine blue. x 150 of ligamentous attachment, showing early deposition of PLATE l(c) Granulation tissue eroding attachment of an reactive bone. Haematoxylin and eosin. x 24 alar ligament. Haematoxylin and eosin. x 60 PLATE 1(h) Greater trochanter. A later stage of healing. PLATE l(d) Iliac crest. Inflammatory erosive lesion Erosion is filled in by trabeculae ofreactive bone to which localized to ligamentous attachment. Haematoxylin and ligament has become reattached in places. Haematoxylin eosin. x 48 and eosin. x 60 Heberden Oration, 1970 Ann Rheum Dis: first published as 10.1136/ard.30.3.213 on 1 May 1971. Downloaded from .1.,, Xt ~~~~~.s 'C !. a, b, c " -, -1 11 d, e, f http://ard.bmj.com/ on October 1, 2021 by guest. Protected copyright. g, h Plate 1. a-h. To face p. 214 Heberden Oration, 1970 215 Ann Rheum Dis: first published as 10.1136/ard.30.3.213 on 1 May 1971. Downloaded from (A) & T%x. (B) (C) FIG. 1 Disc lesions in RA (A) Coronal section ofNCjoint, showing minimal arthritic changes. Haematoxylin and eosin x 16. Reproducedfrom 'Modern Trends in Rheumatology' (1971) p. 118, fig. 1(c). Butterworth, London. (B) Coronal section, showing part of lining of NC joint, and erosion of annulus by granulation tissue. Haematoxylin and eosin x 52 (c) Sagittal (left) andcoronal (right) sections ofsame discs showing, respectively, erosions at disc-bone border and at margins ofNCjoints. a bursa, NC joints are more easily recognized when tissue arising in neighbouring joints and/or bursae. they are inflamed. They then behave like other The AA region, of course, contains numerous rheumatoid joints in the sense that the granulation synovial structures and the density of synovial tissue arising in them erodes the neighbouring tissue relative to bone makes this complex joint cartilage and bone with which it comes into contact unusually susceptible to the effects of erosive (Ball, 1968).
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