Since the 1970s Swanson implant arthroplasty has become a treatment of choice in metacarpohalangeal (MCP) joint arthroplasty in destructed MCP joints of rheumatoid patients. Sutter (Avanta) implant is also composed of silicone but the centre of rotation is more anatomical, and volar to improve extension moment. Clinical results about these implants have been similar but fracture rates of Sutter implant have been reported to be high. Reason for osteolysis is inflammation reaction to silicone particles released from prostheses due to movement of prosthesis in bone or implant fractures. Reports about osteolysis around Swanson implants present variable result.

There is not grading of osteolysis in the literature before and we created a new radiographic grading for osteolysis around silicone MCP implants. Grading is based on involvement of cortical bone: Grade I: Osteolysis varying from a single clear line adjacent to the stem of the prosthesis to a larger, clear area which did not involve the bone cortex; Grade II: Osteolysis affecting the bone cortex to a maximum of one half of the thickness of the cortex; Grade III: Osteolysis affecting the cortex to more than one half of its thickness but not perforating the cortex; Grade IV: Osteolysis perforating the cortex.

In this study we compare the incidence of radiographic osteolysis following insertion of 89 Swanson and 126 Sutter MCP implants in rheumatoid arthritis patients. Before surgery hands were randomised one by one to Swanson and Sutter implant groups. The mean follow-up time in the two groups of patients was 57 (40–80) and 55 (36–79) months, respectively.

A total of 45 (60%) metacarpal and 40 (53%) proximal phalangeal bones showed no osteolytic changes in the Swanson group. In the Sutter group numbers were 20 (21%) and 26 (27%). In the Swanson group, there was less cortical osteolysis and there were 4 (5%) perforations of a metacarpal and no perforations of a proximal phalanx. In the Sutter group, there were 9 (9%) perforations in a metacarpal and 5 (5%) in a proximal phalanx. (p< 0.001). To create a single independent observation of osteolysis for a hand, the worst osteolysis of a metacarpal or proximal phalanx was recorded. There was only one (5%) perforation in the Swanson group, while there were 8 (30%) perforations in the Sutter group (p=0.011). In all grades of our classification, osteolysis was more frequent in the Sutter than in the Swanson group.

Aims: To study the survivorship of molded versus modular tibial component of the unconstrained anatomic graduated component (AGC; Biomet) prosthesis design.

Methods: We studied 794 knees of patients with rheumatoid arthritis operated 1985 – 1995 at the Rheumatism Foundation Hospital (=RFH), Heinola, Finland. Larsen score (=LS) of the preoperative radiographs was examined. Data was gathered from patient files and EULAR-database at RFH. A Kaplan-Meier survivorship analysis was performed with an endpoint of revision.

Results: We found no significant differences between survival of the molded (=group A)and the modular tibia (=group B) components. After 11 years cumulative success rate was 95% in A and 94,8% in the B group. The median follow-up was 7,95 years (group A 11,3, group B 7,4 years). 38 knees ended to an revision, and infection and pain were the main causes. Groups did not differ by LS or by demographic factors like age or weight. Fixation of the tibia or of the femur was also of no significance.

Conclusions: In our material there was no difference in the survival of two different designs of tibia component used in TKAs for patients with rheumatoid arthritis. Survival rates in both groups after 11 years follow-up can be considered promising.

Aims: The aim of the present study was to compare the functional outcome between silastic Swanson and Sutter implants in metacarpophalangeal joints in a prospective and randomised of study of patients with rheumatoid arthritis. Methods: The study was prospective and randomised. Thematerial comprised 53 patients (6 men, 47 women) and 58 hands; a total of 89 Swanson and 126 Sutter implants were installed. The mean follow-up time was 57 (40–80) and 55 (36–79) months, respectively. Results: Active extension was corrected similarly in both groups. In the Swanson group from median [inter-quartile rate (IQR)] 22° (8, 44) to 12° (0,20), and in the Sutter group from 19° (7, 37) to 16 (5, 25). The median active flexion decreased less in the Sutter group from 75° (69, 84) to 64° (53, 72) vs. Swanson from 83° (77, 90) to 58° (48, 64) during the follow-up, and with that respect the difference between the groups was statistically significant (p=0.01). Statistically significant difference (p=0.03) was detected in correction of ulnar deviation only in ring finger: in the Swanson group from median 25°(6°, 34°) ulnar deviation to 1°(2°radial, 9°) radial deviation and in the Sutter group from 14°(7°, 28°) to 5°(0°, 13∞) respectively. Conclusion: It appears that the Sutter implant yields at least as good functional results in the MCP replacement as the Swanson prosthesis.

Aims: To examine whether functional radiography and functional magnetic resonance imaging (MRI) are equal to detect the extent of unstabile anterior atlantoaxial subluxation (aAAS) in rheumatic patients. Methods: The series consisted of 23 patients with unstable aAAS (diagnosed by functional radiography) examined by functional MRI because of a neck symptom. Twenty-two patients had rheumatoid arthritis and one had juvenile idiopathic arthritis. aAAS was diagnosed if the anterior atlanto-axial diameter (AAD) was > 3 mm and was considered unstable if the AAD differed > 2 mm between flexion and extension radiographs. The AAD was measured from radiographs (flexion and extension) and MRI images (flexion and neutral). Results: The extent of aAAS during flexion measured by radiography was greater than that found by MRI in all our 23 cases [the mean difference was 3 mm (95% CI: 2 to 4)]. In 4 patients (17%) MRI could not find aAAS. The difference between the AAD measurements during flexion by these two methods was substantial (i.e. , ≥ 4 mm) in 9 cases (39%). Severe aAAS (≥ 9 mm) was seen in 15 patients (65%) by functional radiography and in 4 (17%) by functional MRI. Conclusions: The magnitude of aAAS was often substantially smaller in functional MRI than in functional radiography. Thus one cannot rely on functional MRI alone; functional radiographs are needed to show the size of unstable aAAS.

We present the results of 525 primary Souter elbow arthroplasties undertaken in 406 patients between 1982 and 1997. There were 372 women and 34 men with a mean age of 57 years; 119 patients had a bilateral procedure. The elbows were affected by chronic inflammatory disease, usually rheumatoid arthritis, which had been present for a mean of 24.7 years (2 to 70). In about 30% the joints were grossly destroyed with significant loss of bone. In 179 elbows the ulnar components were metal-backed and retentive; in the remaining 346, with better bone stock, non-retentive, all-polyethylene prostheses were used.

Because of complications, 108 further operations were required in 82 patients. During the early years the incidence of complications was higher. Dislocation was the indication for 30 further procedures in 26 patients. Thirty patients underwent 33 revision procedures for aseptic loosening, 12 had 29 operations because of deep infection, two for superficial infection, and 14 further operations were done for other reasons. The cumulative rate of success, without aseptic loosening, five and ten years after surgery, was 96% and 85%, respectively.

Between 1971 and 1991 we performed Charnley low-friction arthroplasty (LFA) on 116 patients (186 hips) with juvenile chronic arthritis (JCA). We have now carried out a survival study, taking endpoints as revision, death or the end of the year 1993.

Overall survival was 91.9% at ten years and 83.0% at 15 years. That of the femoral component was 95.6% at ten years and 91.9% at 15 years and of the acetabulum 95.0% and 87.8%, respectively. Only the use of steroids significantly impaired the survival.

We therefore recommend the use of Charnley LFA for young patients with JCA requiring total hip replacement.