Therapy of the Rheumatic Knee

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This entry is adapted from the peer-reviewed paper 10.3390/app10238600

In rheumatoid arthritis, the joints of the lower extremities are almost always affected. This is most conspicuous in the knee joint. In rheumatics, inflammatory osteoarthritis manifests itself comparably earlier than in patients with osteoarthritis. The focus of attention was primarily on the synovia with its destruction process and secondary changes. Now, driven by experimental research, dendritic cells and fibroblasts and molecular features are moving into the clinician’s field of vision. Even in joints that appear to be in remission with no swelling or pain, the activity of these cells leads to changes in the capsule-ligaments. The complex deformities and instabilities caused by this, in conjunction with atrophy of the inter-articular musculature, have an impact on the activities of daily life (ADL). If these biomechanical aspects of the knee joint are not taken into account early on in therapy, the frequency of primary and secondary surgical treatment increases. The timely recognition of biomechanical pathologies and consistent treatment can contribute to improving the patient situation in addition to adequate medication therapy.

sarcopenia rheumatoid arthritis synovial fibroblast (RASF) biomechanics knee knee surgery rheumatoid arthritis register of complications Orthopaedisch Rheumatologische Jahresuntersuchung

1. Introduction

Rheumatoid arthritis (RA) is an inflammatory autoimmune disease that affects the knee joints in over 90% of patients. Kerschbaumer distinguishes between two different forms of the disease with different biomechanical characteristics ^[1]. Patients with juvenile arthritis or seronegative arthritis are prone to secondary anomalies and early destruction of the joints and subsequently to contractures. In typical adult RA, direct and indirect damage to the capsule and ligaments occurs without movement deficits. The joints with elongated ligaments decenter early and lead to the destruction of the articular surfaces. If the changes occur gradually and over a longer time, the affected persons are nevertheless considerably restricted in their mobility. The activity of an inflammatory gonarthritis with a proliferating synovialis does not necessarily have to be accompanied by a visible thickening of the capsule and effusion formation. Pronounced states of swelling are easily recognizable, but these need not be exclusively articular. Venous or lymphatic congestion also leads to edema and impresses with a similar clinical picture. Progress in understanding the signaling pathways that control disease activity and the course of inflammatory changes at the intra- and intercellular level has made efficient therapy possible ^[2]^[3]^[4]. This leads to a significant reduction in inflammatory activity and thus more patients achieve remission. However, individual “rebellious” joints may not respond to the drug therapy or may not respond sufficiently. The periarticular structures are also directly damaged by inflammatory mediators. Seemingly inconspicuous findings elude the course of diagnosis of the Disease Activity Score 28 (DAS28), as they remain under the radar of the rheumatologist. For this reason, regular monitoring of joints and periarticular structures not covered by the DAS28 is important, especially in the case of tendons and ligaments. As an extension/supplement to the DAS28, the annual orthopedic rheumatological examination (ORJ) records such pathologies and enables the physician to include them in the therapy concept ^[5].

A concept for the therapy of rheumatoid knee joint manifestations must take into account conservative and surgical treatment of the knee joint according to the stage of the disease and take into account the individual characteristics of the patient ^[6]^[7]. It is up to the therapist to adapt these according to his or her level of knowledge and to carefully weigh the potential risks against the benefits ^[1]^[8]. Problems and complications can occur earlier and more severely in the knee joint than in osteoarthritic patients due to the limited compensation possibilities offered by the adjacent joint, which is usually also affected.

2. Cellular and Molecular Mechanisms of Joint Manifestation

For a long time, the biomechanical characteristics of RA in the knee joint were exclusively seen as associated with synovitis, swelling, and chronic overloading of the capsule ligaments. However, a generalized chronic disease is not limited to single cells. New research on the mechanisms of RA has shown the involvement of periarticular cells and structures in the disease, which have not been the focus of surgeons until now. Generalized existing autoantibodies, such as anti-citrullinated protein antibodies (ACPA) and cytokines maintain the production of inflammatory mediators in addition to synovial fibroblasts and lead to oxidative stress. ACPAs have been shown in controlled studies to be good predictors of rapid progressive joint destruction due to erosive arthritis. The heterogeneity of gene expression also leads to altered cell lines such as fibroblast-like synovial cells (FLS), or mast cells maintain the inflammatory destructive processes of joint damage ^[9]^[10]. Fibroblasts and FLS and their interaction with cells of the immune system such as neutrophils and T cells play a key role in the inflammatory destructive processes of the joints. In the early phase of the disease, an increased number of neutrophils can be detected. They increase the oxidative stress in the tissue, can form neutrophil extracellular traps (NETs), and at the same time promote the citrullination of arginine via an intracellular activation of peptidyl arginine deiminase-4 (PAD4) and store it in the NETs ^[11]^[12]. Compared to patients with osteoarthritis, the oxidative stress in the tissue of rheumatic patients is significantly higher ^[13]^[14]. ACPAs, with a specificity of 97% for RA, can be detected in the blood up to 10 years before the manifestation of RA. In the case of macroscopic findings, this should entail a histopathological workup of the synovial tissue to detect developing RA at an early stage ^[15]^[16]. ACPAs activate FLS, which in turn present T cells to NET-citrullinated peptides and lead to autoimmunity ^[17]. In the joint, excessive proliferation of FLS leads to hyperplastic pannus and increased secretion of chondrotoxic mediators such as matrix metalloproteinases (MMP). As a result, direct and indirect irreversible damage to the joint surfaces occurs, which is detectable even with sufficient basic therapy ^[18]. FLS also secrete vasoactive and immunomodulating molecules that can induce periarticular vasculitis and promote differentiation of osteoclasts by activating the Receptor Activator of NF-κB Ligand (RANK-L) ^[19]^[20]. Regulation and modulation of these molecules are performed by CD4+ T-helper cells. The disturbed function of the cells leads to an increase in interleukins in the tissue, which is significantly higher than in osteoarthritis ^[21]. Changes can also be found at the RNA level. Gene polymorphisms and an altered microbiome lead to altered free microRNA (miRNA) as an adaptation of epigenetic mechanisms, which interferes with RNA transcription ^[22]^[23]. Current research in connection with SARS-CoV2 makes use of these polymorphisms in a therapeutic approach ^[24].

The stage-like course of rheumatoid arthritis should be countered by a feasible therapeutic concept that takes into account conservative and surgical treatments of the knee joint and the individual characteristics of the patients (Figure 1). Figure 1: Therapeutic concept for the rheumatic knee acc. to Larsen, Dale and Eek

It is the therapist's responsibility to adapt this according to his or her level of knowledge and to carefully weigh the potential risks against the benefits ^[25]^[26]^[27]^[28]. Problems and complications can occur earlier and more pronounced in the rheumatic knee than in osteoarthritic patients due to the limited possibilities for compensation by the neighboring joints, which are usually also affected.

3. Conservative Therapy

According to the current recommendations of the American College of Rheumatology (ACR)/European League Against Rheumatism (EULAR), a treat-to-target strategy in the treatment of RA is being implemented today ^[29]. The aim here is early diagnosis and early therapy according to the principle of “hit hard and early”, under which secondary damage to joints could be significantly reduced. An improved course of the disease can detect therapy failures earlier, which is due to the heterogeneity of rheumatoid arthritis synovial fibroblast (RASF) in particular. Therapy can therefore be adapted earlier than was possible just a few years ago, away from the systemic administration of oral corticoids and cell line depletors (e.g., rituximab = RTX), towards antibody therapy against inflammation mediators or small molecule inhibition (Janus kinase inhibitors) ^[10]. In particular, the wider range of biological disease-modifying antirheumatic drugs (bDMARDs) and targeted synthetic DMARDs (tsDMARDs) is giving a boost to drug therapy in the direction of individualization and specification ^[10]^[30]. Over the last decades, these measures have led to a reduction of up to 90% in the number of rheumatism-related operations ^[31]^[32]. The international consensus for perioperative drug therapy has been adapted accordingly in individual countries ^[33]^[34]. These also depend on the experience of complications experienced by surgeons ^[35]^[36]. Independent registry data make a valuable contribution to the continuous improvement of the patient’s situation ^[37]. Compared to patients with osteoarthritis, rheumatics show a higher level of satisfaction and, at the same time, a measurably poorer function of surgically treated joints such as the knee ^[38]^[39].

In osteoarthritis, in particular, alternative therapeutic approaches are now increasingly gaining interest to activate self-healing powers ^[40]^[41]^[42]. In most cases, these are limited first and foremost to changes in diet and diets that reduce inflammatory cytokines and oxidative mediators ^[22]^[40]. Individual ingredients have been characterized in more detail. Tripterygium wilfordii Hook F (TwHF), for example, shows comparable effects to methotrexate (MTX), but the bioavailability of these natural substances is still poor ^[43]. In the future, this could be improved by packaging the substances in nanoparticles. Flavonoids, which are used against oxygen radicals, can modulate intracellular signaling pathways ^[44]. Piperine (alkaloid of pepper) inhibits prostaglandin E2 (PGE2) ^[45]. The treatment of chronic pain with cannabinoids has also increased in recent years. Studies have been able to detect cannabis receptors in inflammatory synovia, which allows for targeted complementary pain management ^[46]. However, many of these results may not be easily transferable to the situation of rheumatics, as they have a cascade of different regulatory disorders. Therefore, these approaches are not sufficient as the sole therapeutic measure for patients.

In addition to drug therapy, the promotion of physical activity in treatment is becoming increasingly important again ^[47]. In children and adolescents, this can be achieved with the help of conservative therapy. The central component here is physical therapy with simultaneous training in joint protection for the patient and parents. Often the basic rheumatological therapy is insufficiently available. For children and adolescents, in particular, to be able to participate in social life without any problems they also require specific advice on sports and other leisure activities. For example, alternatives to sports that put a strain on the knee joint should be recommended (e.g., speed skating vs. ice hockey).

The prevalence of sarcopenia in rheumatics is about 20% and depends primarily on the age of the patient and his or her disability ^[48]^[49]. Thus, muscle training should be started and sustained as early as possible. An increase in physical activity leads to a decrease in inflammatory activity, whereby most studies are limited to the measurement of non-specific markers ^[50]. Already more than 20 years ago, a randomized study demonstrated an improvement in muscle strength through specific training with simultaneous pain reduction ^[51]. Gait analyses of rheumatic patients have shown a harmonization of the gait pattern in all phases under effective therapy with DMARDs ^[52]. Most studies, however, only deal with biomechanical characteristics of the knee joint after its endo-prosthetic treatment.

Newer studies recommend an early clarification of accompanying psychological problems since rheumatics are relatively more strongly impaired here than comparable collectives of arthritics ^[53]. It is up to the empathy of the doctor to be able to address this and initiate specific help. Unfortunately, out of false shame and insecurity, the treatment is usually limited to organic suffering.

If oligo-arthritis is present, in addition to physiotherapy and muscle training, decongestant measures such as cryotherapy and sonophoresis can be added. The intra-articular application of corticoids is increasingly viewed critically. Even local application increases the risk of secondary infection in immunomodulated patients. On the other hand, even low doses of cortisone seem to have long-term negative effects on bone metabolism. In animal models, osteomalacia can be detected in young rats after cortisone administration ^[54].

4. Surgical Therapy

In cases of persistent synovitis and an insufficient response to otherwise good drug therapy, the inflammatory mucosa should be removed. Synovectomy removes proinflammatory cytokines and simultaneously free nerve endings, which leads to a reduction in pain ^[55]. Today, arthroscopic synovectomy is considered standard therapy ^[56].

Surgical arthroscopic removal should also or especially be discussed in adolescents (Figure 2, Figure 3, and Figure 4). The age limits for subsequent or, as an alternative, primary radio-synoviorthesis (RSO) have shifted to the front in recent years ^[57]^[58]. This is certainly also due to the lack of an alternative after the ban on chemical synoviorthesis ^[59]^[60]^[61].

Figure 2. Synovial masses in the knee. 12-year-old boy with two years of symptomatic arthritis and insufficient medical treatment.

Figure 3. MRI knee of a 12-year-old boy preoperative.

Figure 4. MRI knee of a 12-year-old boy, three months after arthroscopic synovectomy.

Open joint-preserving procedures are now only used in special cases, such as arthrofibrosis with an inflammatory component.

Recurrences of synovitis are usually the result of a lack of radicality during surgery or a delay in follow-up therapy so that the remaining tissue can proliferate again. Therefore, an overall concept with therapy planning is essential even “beyond the day”.

Before an operative intervention, an examination of the popliteal fossa and, if necessary, sonographic clarification should be performed to document the presence and extent of a Baker’s cyst. MRI is reserved for special questions, such as the clarification of pigmented villonodular synovitis (hemosiderin deposits in the cell layer).

The rheumatologically experienced surgeon should know alternative approaches, such as the subvastus approach ^[62]. Delayed healing should be taken into account in postoperative therapy and mobilization. In most cases, the preference for stability over mobility is the better choice for rheumatics. In the long term, rheumatoid joints tend to lose tension in the course of the disease due to the above-mentioned involvement of the periarticular structures in the disease process. This must also be taken into account in endo-prosthetic treatment.

Once initiated, the destruction of the joint surfaces proceeds progressively as a result of increased local inflammatory activity ^[63]. Even after synovectomy and appropriate basic therapy, further damage can be detected on MRI ^[18]. The body’s repair mechanisms are insufficient since they consist of inferior bone and fibrous cartilage. Chondroprotective or reconstructive procedures in rheumatics are limited to micro fracturing and denervation at the cartilage-bone interface.

5. Joint Replacement Therapy/Endo-Prosthetic Treatment

In case of advanced destruction of the joint surfaces, endo-prosthetic treatment is indicated. Surface replacement is also considered the gold standard for rheumatics. The widespread recommendation among arthroplasty patients to wait until an advanced age before fitting the prosthesis cannot be given to rheumatics. Rather a “wait and see” leads to destroyed and unstable knee joints and young rheumatoid persons leads more quickly to the wheelchair obligation ^[64]. However, adequate basic therapy is and remains a basic requirement and without it, no surgical treatment is possible ^[65].

Very often, zones of severely sclerosed bone are found in inflammatory destroyed joints next to highly osteoporotic rarefied areas. In this case, fractures or bony tears of the collateral ligament attachments may occur during synovectomy. These are addressed intra-operatively and the knee joint is then fitted with a temporary orthosis. If the joint is so severely destroyed that the collateral ligaments do not allow stable guidance, axis-guided prostheses should be used. In the postoperative course, however, a periprosthetic fatigue fracture may still occur, in which a change of prosthesis is not always necessary, but stable osteosynthesis may be a sensible therapeutic option. The overall situation with the compensation options must always be considered.

The treatment of a rheumatoid knee joint with a unicondylar prosthesis is only rarely possible since the capsuloligamentous situation is usually already severely damaged. Dierkes et al. were able to present good long-term results with unicompartmental treatment in conjunction with radical synovectomy ^[66]. The retropatellar joint surface should not be treated with an endoprosthesis. The risk of early loosening with patella fracture and free cement portions, which can cause damage to the PE of the prosthesis, is too great. An alternative is to cover the patellar joint surface with a capsule flap as a patella-resection interposition arthroplasty (RIAP) ^[67].

In the case of rheumatoid knee joints, the long-term kinematics of the ligament and tendon structures should be taken into account when implanting a prosthesis. Careful balancing is crucial for the long-term success of the operation ^[68]^[69]. For this reason, minimal invasive treatment is considered a risk factor. Due to the synovial stretching of the capsule, rheumatics tend to subsequently loosen the ligament connections, so that tighter implantation of the surface replacement is the primary goal. Full-extension in the joint is achieved by active and passive physiotherapy of the joint. Orthopedic surgeons and trauma surgeons who do not have a unit trained in the specifics of rheumatism should tend to use a ligament-relieving, (partially) coupled prosthesis during surgery if the ligament is critical ^[1]. For the survival of the endoprosthesis in situ, the complete and meticulous synovectomy during primary surgery is and remains decisive, especially for rheumatics ^[64]^[70].

Contractures of the collateral ligaments can be corrected using femoral osteotomy and screw fixation ^[1], but even minor traumas are sufficient to damage previously damaged soft tissue structures. If the intraoperative reconstruction is not successful, only a partially coupled or axis-guided implant remains. Reconstruction should always be attempted, particularly with younger patients, to maintain the possibility of withdrawal ^[71].

The disturbed interaction of the cells of the bone metabolism leads to a decrease in bone density, which is further reduced by cortisone medication in basic therapy. Osteoporosis is associated with an increased fracture rate. Comparable results have been shown in animal models ^[54]. The metaphysis is particularly susceptible to osteoporotic changes and usually exhibits poor bone quality with an increased risk of fracture ^[72]. If a fracture occurs, the stability of the endoprosthesis must be clarified primarily, since this is the basis for the surgical treatment. Either the joint can be left as it is and the fracture is treated with osteosynthesis (stable-angle plate, retrograde femoral nail) or by changing the knee prosthesis to an axis-guided model. In the case of periprosthetic fractures with shortening and axial malalignment of the leg, skin-penetrating fixations (external fixator, wire extensions) should nevertheless be avoided, since anchoring in the bone is poor and the secondary risk of infection is significantly increased in immunocompromised patients. Overall, the complication rate in RA is 2.5 times higher than in osteoarthritic patients, and restrictions in range of motion (ROM) up to 4 times higher. An improvement in function and activity also leads to an improvement in sarcopenia in the long term ^[71]^[73].

Postoperatively, pain or pushing situations can occur, which are usually more stressful for the patient than the operation itself. The rheumatism sufferer can usually distinguish the operation-related pain quality very well from the usual inflammation-related pain.

While until a few years ago a cortisone regimen was still common, this now seems obsolete. The recommendation of the German Society of Rheumatology (DGRh) still exists to pause the basic therapy with biologicals for two half-lives after the operation. Depending upon the individual situation, one deviates from it to get the rheumatic activity again under control. To what extent the perioperative administration of biologicals can be modified in the future will be answered by the complication register of the German Society of Orthopedic Rheumatology (DGORh) ^[37].

Patient satisfaction with the therapy depends on the pain projected into the knee joint ^[74]. A precise anamnesis and the identification of the pain site by the patient are important for further treatment. Often, ligamentous or ring-shaped pain is predominant in the area of the proximal tibia. In most cases, there is a simultaneous extension deficit with the overload of the proprio- and nociceptors of the knee joint. Dorsal expansion of the shortened contractile elements leads to a reduction of the retro-patellar contact pressure and pain reduction.

Punctual complaints indicate a local irritation of the infra-patellaris nerve or a suture granuloma. These can be verified and treated by local infiltration with local anesthetics.

In principle, ventral knee complaints after endo-prosthetic treatment can best be avoided by selecting and implanting suitable knee prosthesis systems that minimize the retro-patellar contact pressure both statically and dynamically ^[75]. Studies on the various endoprosthesis models show no significant differences in gait analysis, mobile or rigid platforms have a similar long-term outcome ^[76]^[77]^[78]^[79].

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Christoph Biehl

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