Reducion of friction between bearing surfaces in Total Hip Arthroplasty is a main target of biological tribology. MPC (2-Methacryloyloxyethyl phosphorylcholine) has a similar properties to those of cell membranes, and can reduce friction with fluid luburication. We have used crosslink polyethylene with MPC polymer coating for primary and revision THA since 2011.

Eighty one cementless THA were performed with closslink polyethlene liner with MPC polymer in our hospital. We have examined 21 cases which were followed for more than one year. Eighteen cases for primary THA and three for revision THA, and 3 were male and 18 were female. Seventeen cases were osteoarthritis, two osteonecrosis of femoral head and two rheumatoid arthritis. Average age of patients at THA was 60.4 years old.

In the OR, we have experienced a very wet and slippery feeling on the bearing surface of polyethylene liner every time. Surface touch is similar to skin with lotions. No wear were measured on the X-ray display and no infections and no fractures were occurred during follow up.

MPC polymer coating in THA can be useful for reduction of friction and generation of wear debris.

Purpose: Rheumatoid arthritis (RA) frequently affects the finger joints. Persistent synovitis is believed to cause not only bone destruction but also various deformities of the hands. For this reason, synovectomy of the finger joints is attempted when chronic swelling of the synovium of finger joints does not respond to any conservative treatment. The purpose of this study is to evaluate the effectiveness of surgical synovectomy of finger joints in RA patients.

Method: Forty-six finger joints (MP 24; Steinbrocker Stage II: 8, Stage III: 16) (PIP 22; Stage I: 5, Stage II: 9, Stage III: 8) of 20 patients with rheumatoid arthritis who had synovectomy were examined at an average of 20 months follow-up (range 14–43 months). The active motion exercises of the operated fingers started as early as 2 or 3 days after surgery. The results of synovectomy in these patients were evaluated by pain, range of motion, and radiograph.

Results: Pain was relieved (Visual analogue scale MP: 6.5→1.4, PIP: 6.2→0.7), swelling was diminished in all and only a little loss of motion was observed (arc of motion MP: 59.8→53.4, PIP: 75.5→69.6) after surgery. Radiological bone changes progressed in 4 (17%) MP and 3 (14%) PIP joints. Deformities (ulnar drift or subluxation) after surgery developed in 3 (12%) MP-joints.

Conclusion: Synovectomy performed on finger joints of RA patients were evaluated. From the results of this clinical study we recommend synovectomy of finger joints in RA patients before bone changes, when chronic synovitis of finger joints does not respond to any conservative treatment.

Background: Total wrist arthrodesis is a reliable procedure for severely deteriorated and unstable rheumatoid wrist. In 1999, we developed a new wrist fusion rod (WFR), a cannulated titanium rod could be buried into the third metacarpal with proximal fins and a transverse pin to prevent the rod migration and rotation in the medullary canal. After bone preparation, the 4 mm diameter rod was inserted through a guide pin in ante-grade fashion from the carpus to the neck of the third metacarpal to prevent metacarpal fracture. Then the rod was inserted in retrograde fashion into the radius with an introducer, and countersunk until the distal end of the reached the metacarpal isthmus. After burying the rod, it was bent to the desired angle using a special bender.

Materials and Methods: Total wrist arthrodesis was performed using this rod on 39 wrists in 33 patients with rheumatoid arthritis (6 males and 27 females). Their radiographic change was Larsen grade IV or V with subluxation at the radiocarpal joint. The mean age at the operation was 60 yrs. old (28 to 75), and the mean duration of the disease was 12 yrs. (3 to 40). The mean follow-up period was 39 mos. (5 to 75). Supplemental fixation with staples was incorporated in this intramedullary fixation. Iliac bone was grafted on 8 mutilated wrists in 8 patients. Postoperative immobilization using a short arm cast or a wrist brace was continued for 8 weeks.

Results: Preoperative pain and swelling disappeared in all operated wrists, and grip strength increased in 31 wrists (79%). The mean preoperative grip strength increased from 97 mmHg to 124 mmHg postoperatively. Subluxated wrist was reduced and fused in slight extension and slight ulnar deviation. The rod did not migrate distally or proximally in the medullary canal. Bony fusion was obtained in 36 wrists (92%). Four rods (10%) were broken due to an overuse or a fall before completion of fusion; however, they did not cause any pain. There were no major complications.

Conclusion: Using this WFR, rigid fixation at the desired angle was obtained in the total wrist arthrodesis on rheumatoid wrist. It is technically simple, safe and fast to use.

Objective: The objective of this study was to clarify the clinical outcome of upper-extremity surgeries for the rheumatoid patients using the Japanese version of the DASH Disabilities of the Arm, Shoulder and Hand questionnaire and to investigate whether the outcome was affected by the activity of the disease.

Materials and methods: One hundred and twenty seven surgical procedures in 103 rheumatoid patients (male: 26, female: 77) were included in this study. Surgeries were performed in 4 shoulders (HHR: 4), 35 elbows (TEA: 28, synovectomy: 6 etc.), 60 wrists (Kapandji: 6, radiolunate arthrodesis: 28, total arthrodesis: 7, extensor tendon reconstruction: 19 etc), and 28 hands (MP Swanson: 13, PIP fusion: 7, thumb IP fusion: 4 etc.). The patients’ average age at the surgery was 61 years and an average duration of the disease was 11 years. The DASH (function/symptoms) score and DAS (Disease Activity Score) 28-CRP(4) were taken just before the surgery and an average of 1 year and 3 months after the surgery. According to the EULAR’s improvement criteria, disease activity and response to the medical treatment was determined.

Results: The preoperative DASH score decreased in 96 surgical procedures (76%) postoperatively and the average score decreased from 50 to 38 (n=127, p< 0.01). Change in the score was −17 in shoulder surgeries (n=4, p=0.17), −12 in elbow surgeries (n=35, p< 0.01), −12 in wrist surgeries (n=60, p< 0.01) and −10 in hand surgeries (n=28, p< 0.05). The DASH score in the patients with preoperative HDA (high disease activity: n=16, from 70 to 57, p< 0.01) remained high compared to those with preoperative LDA (low disease activity: n=23, from 45 to 32, p< 0.01) and MDA (moderate disease activity: n=88, from 47 to 36, p< 0.01). Decrease in the score was more prominent in the patients with good response to the medical treatment (n=34, −22, p< 0.01) than those with moderate response (n=38, −11, p< 0.01) or no response (n=55, −6, p< 0.05). There was no significant decrease in the postoperative score in the patients with increased DAS28-CRP (4) (n=26, −1, p=0.822).

Conclusions: The clinical outcome of upper-extremity surgeries for the rheumatoid patients was good. Control of the disease activity by the medical treatment proved to be one of the important factors to produce a favourable outcome of surgical treatment.

Introduction

The wrist is the ”key-stone” of hand function. Painless stability is a prerequisite for the rheumatoid wrist to perform various manual tasks. Synovectomy of the extensor tendons and the wrist joint with a Darrach procedure is offered for painful wrists, which are not controlled by conservative treatment with medication and orthosis. Radiolunate arthrodesis is performed on wrists with an unstable radiocarpal joint and preserved midcarpal joint space. This study describes the long-term (more than 10 years) follow-up of these operative procedures.

Materials and methods

The follow-up study was performed on 25 wrists in 25 rheumatoid patients (22 women and 3 men), whose average age was 52 years (range, 33 to 66 years) with an average disease duration of 12 years (range, 1 to 38 years). The average follow-up period was 12. 5 years (range, 10 to 18 years). Five wrists were Larsen-Dale-Eek’s grade II, 14 were grade III, and 6 were grade IV. Depending on the severity of bone destruction, the scaphoid in 6 wrists and the triquetrum in 3 wrists were included in the fusion site.

Results

Preoperative pain (88%) and swelling (96%) decreased remarkably at follow-up (12%, 4%). Average grip strength increased significantly from 100mmHg to 140mmHg (p< 0. 01). The total arc of wrist extension/ flexion decreased to two-thirds of the preoperative arc with a major loss in flexion (preop. : 26/28degrees, follow-up: 23/13degrees). The range of forearm rotation increased due to a Darrach procedure. In periodical X-ray assessments of 23 wrists, carpal collapse initially improved following the operation, however, it returned to the preoperative level after 5 years. Ulnar carpal shift improved significantly after the operation (p< 0. 01), and the position remained unchanged over 10 years. In palmar carpal subluxation, no remarkable change was noted. Bone union occurred in 87% of the operated wrists and the remaining 13% had fibrous union. Widening at the lunocapitate joint (> 2mm) was noted in 4 wrists (17%) and progressive instability at the midcarpal joint occurred in one wrist with the mutilating type of disease. Narrowing (< 1mm) was noted in 5 wrists (22%) and 3 wrists were totally fused in the functional position.

Discussion

Radiolunate arthrodesis provides good stability with some motion for the moderately deteriorated rheumatoid wrist more than 10 years after the operation, in spite of some radiological progression of the disease. This operation is considered to convert the natural course of the rheumatoid wrist from the unstable form to the stable form.

Introduction

The wrist is the ”key-stone” of hand function. Painless stability is a prerequisite for the rheumatoid wrist to perform various manual tasks. Synovectomy of the extensor tendons and the wrist joint with a Darrach procedure is offered for painful wrists, which are not controlled by conservative treatment with medication and orthosis. Radiolunate arthrodesis is performed on wrists with an unstable radiocarpal joint and preserved midcarpal joint space. This study describes the long-term (more than 10 years) follow-up of these operative procedures.

Materials and methods

The follow-up study was performed on 25 wrists in 25 rheumatoid patients (22 women and 3 men), whose average age was 52 years (range, 33 to 66 years) with an average disease duration of 12 years (range, 1 to 38 years). The average follow-up period was 12. 5 years (range, 10 to 18 years). Five wrists were Larsen-Dale-Eek’s grade II, 14 were grade III, and 6 were grade IV. Depending on the severity of bone destruction, the scaphoid in 6 wrists and the triquetrum in 3 wrists were included in the fusion site.

Results

Preoperative pain (88%) and swelling (96%) decreased remarkably at follow-up (12%, 4%). Average grip strength increased significantly from 100mmHg to 140mmHg (p< 0. 01). The total arc of wrist extension/ flexion decreased to two-thirds of the preoperative arc with a major loss in flexion (preop. : 26/28degrees, follow-up: 23/13degrees). The range of forearm rotation increased due to a Darrach procedure. In periodical X-ray assessments of 23 wrists, carpal collapse initially improved following the operation, however, it returned to the preoperative level after 5 years. Ulnar carpal shift improved significantly after the operation (p< 0. 01), and the position remained unchanged over 10 years. In palmar carpal subluxation, no remarkable change was noted. Bone union occurred in 87% of the operated wrists and the remaining 13% had fibrous union. Widening at the lunocapitate joint (> 2mm) was noted in 4 wrists (17%) and progressive instability at the midcarpal joint occurred in one wrist with the mutilating type of disease. Narrowing (< 1mm) was noted in 5 wrists (22%) and 3 wrists were totally fused in the functional position.

Discussion

Radiolunate arthrodesis provides good stability with some motion for the moderately deteriorated rheumatoid wrist more than 10 years after the operation, in spite of some radiological progression of the disease. This operation is considered to convert the natural course of the rheumatoid wrist from the unstable form to the stable form.

Introduction

Since 1981, we have used various types of the total hip prosthesis for the reconstruction of the acetabular protrusion in rheumatoid arthritis. The cemented Charnley prosthesis was used during the initial 8 years, and we experienced loosening of the cemented acetabular socket in some cases. The bipolar femoral head prosthesis, which started to be used from 1984, was one of the cementless prosthesis. And it showed high frequency of proximal migration of outerhead. The threaded socket also showed frequent loosening. To overcome these problems, we started to utilize a new method from 1988. This method included packing morselized bone grafts into the acetabulum and fix them using a porous coated socket and screws. This study describes the results of cementless total hip arthroplasty (THA) for the acetabular protrusion in rheumatoid arthritiswith this method.

Materials and methods

Sixty -one cementless THAs with use of porous coated acetabular socket were performed in 50 patients who had sever protruded acetabulum due to rheumatoid arthritis. The average follow –up period was 9 years and 5 months (range, 5 to 13 years). A Mallory/ Head prosthesis with porous coated socket was used in 43 hips and other types in 18 hips. In all operated hips, autogenous morselized bones were grafted on the thin acetabullar wall.

Results

The clinical improvement in pain was the most apparent. X-ray findings of the grafted bone in the acetabulum showed a homogenous pattern in most cases (90. 2%) at 6 months after the operation. A radiolucent zone at a non-weight-bearing area between the grafted bone and socket was seen in 20 hips (32. 7%) for 3 years after the operation, and it gradually disappeared and changed to a sclerotic zone. Collapse and /or absorption of the grafted bone were noted in 3 hips of the patients with sever osteoporosis and high disease activity.

Discussion

There are several technical key points to succeed THA in patients with rheumatoid arthritis. The first is the selection of the acetabular socket. The second is the method of bone grafting, and the third is the size and the shape of grafted bones. We have used various types of prosthesis for the protruded acetabulum so far, and it was considered that the bipolar and threaded types are not acceptable because of their high frequency of proximal migration and loosening. The mass and /or block bone should not be used, because they are liable to fall into collapse. It is safely recommended to use slice or morselized bones to lead the grafts to early survival and remodelling caused by tight and close contacts.

Conclusion

THA with the use of morselized bone grafting into the acetabulum and a fixation with a porous coated socket-and screws is a simple and useful procedure for treating protruded acetabulum in rheumatoid arthritis.