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456-z-umb_nardini.qxdEur Arch Otorhinolaryngol (2002) 259 : 279–284DOI 10.1007/s00405-002-0456-z L.Guarda-Nardini · R. Tito · A. Staffieri · A. Beltrame
Treatment of patients with arthrosis of the temporomandibular joint by infiltration of sodium hyaluronate: a preliminary study Received: 20 June 2001 / Accepted: 25 January 2002 / Published online: 24 April 2002 Springer-Verlag 2002 Abstract Patients with degenerative disease of the tem-
easy technique proved to be valid and lasting. This infil- poromandibular joint (TMJ) who did not respond to con- tration technique using sodium hyaluronate looks very servative medical therapy (splint therapy, selected grind- promising for patients affected by symptomatic DJD who ing or physiotherapy) can be treated by arthrocentesis, do not respond to conservative medical therapy, reflecting which is associated with intra-articular injections of so- similarly encouraging findings in the orthopaedic treat- dium hyaluronate (Hyalgan). In this study, we treated ten ment of degenerative knee pathology.
dysfunctional patients with degenerative joint disease(DJD) who had been diagnosed clinically and had had the Keywords Temporomandibular joint · Degenerative
diagnosis confirmed by MRI. All subjects presented im- joint disease · Arthrocentesis · Sodium hyaluronate · paired mouth opening, joint pain at rest and on movement and impaired masticatory efficiency. We performed onecycle of five infiltrations with joint arthrocentesis and theinjection of sodium hyaluronate at weekly intervals. The following parameters were assessed before and after infil-tration and at follow-up after 6 months: mouth opening Sodium hyaluronate, a glycosaminoglycan produced and (with a mean of between 36.5 mm and 41.9 mm); side- released by specialised synovial cells, is present in partic- ways movements (to the right 4.9 mm to 8.9 mm and to ularly high concentrations in the joint cartilage and syno- the left 4.7 mm to 9.2 mm); pain at rest (VAS=1.8 to 0.5) vial fluid. In normal conditions, this substance plays an and on movement (VAS=7.8 to 1.1); masticatory effi- important role in maintaining intra-articular homeostasis: ciency (VAS=5.7 to 8.6); subjective judgement of the it favours the elasticity and viscosity of the synovial fluid, functional TMJ limitation level (from 2.8 to 0.8); judge- providing a cushion against any shocks; it has a lubricat- ment of efficacy (from 2.4 to 3.2); judgement of tolerabil- ing, anti-inflammatory and pain-relieving action and en- ity to the therapy (from 2.0 to 3.1). The therapeutic bene- ables the tissue repair processes to be activated in the car- fits observed can be attributed both to joint arthrocentesis tilage with a normalising action on the synthesis of endo- and to the characteristics of sodium hyaluronate itself. All genous acid by the synovial cells .
the parameters considered revealed a statistically signifi- In the presence of osteoarthrosis, the concentration and cant positive variation that persisted over time (P<0.05).
molecular weight of sodium hyaluronate in the synovial The results obtained by this minimally invasive, fast and fluid are diminished as a consequence of the dilution,fragmentation and production of acid molecules with alower weight than normal, thus compromising the condi-tions of homeostasis . In order to overcome this prob- L. Guarda-Nardini (✉) · R. Tito lem, a treatment has been devised whereby the pathologi- Department of Medicine and Surgery, University of Padua, cal fluid is removed from the joint and exogenous sodium hyaluronate is infiltrated, thus bringing the concentration e-mail: firstname.lastname@example.org, Tel.: +347-358-3259 and molecular weight of the synovial fluid back to nor-mal. This kind of treatment is called viscosupplementa- tion  and has already been used for many years to treat Department of Ear, Nose and Throat, University of Padua, Padua, Italy degenerative knee pathology [4, 5, 6].
Sodium hyaluronate injection has also been proposed for the treatment of TMJ symptomatic degenerative dis- Department of Dentistry and Stomatology, University of Padua, Padua, Italy ease that has failed to respond to conservative medical
and physical therapies. This minimally invasive therapeu- tesis is complete, 1 cc of Hyalgan is injected into the joint, and the tic approach using arthrocentesis and infiltration aims to two needles are removed.
During treatment, the mouth opening is monitored before and restore the protective function of the synovial fluid, nor- after each infiltration. Assessments are then made of the presence malising the concentration and molecular weight of the or absence of pain when chewing food and at rest and of the pa- sodium hyaluronate .
tient's masticatory efficiency before each infiltration. Even thefunctional limitation level of the joint is assessed after each ad-ministration. The patient's judgement about the efficacy of thetherapy and the tolerability of the infiltration procedure itself are Materials and methods also recorded. In the follow-up period, the patients are again assessed on the basis of all the chosen parameters at 1, 3 and In this study, ten patients suffering from DJD (nine women and 6 months after the last of the five infiltrations. During the whole one man, age range: 39–68 years, mean age: 49.3 years) underwent period of the five infiltrations, patients followed a physiotherapy one cycle of five infiltrations [8, 9] of sodium hyaluronate (Hyal- program of guided mouth opening that went on for 4 weeks after gan from Fidia S.p.A.) into one or both of the TMJ, with a total of the last injection.
15 joints being infiltrated according to the protocol in use for thetreatment of degenerative knee pathology [10, 11, 12, 13].
Before being treated with infiltration, all of the patients in- volved in this study had undergone splint therapy, physiotherapy or selected grinding without success. All persons gave their in-formed consent prior to being treated. The treatment with Hyalganwas always preceded by arthrocentesis of the upper joint cavity After the cycle of infiltrations it was possible to note that with Ringer-lactate solution.
spontaneous opening of the mouth had improved in each The patients presented degenerative disease with pain, crepitus of the patients who had been treated by a minimum of in the joint and impaired mouth opening and masticatory effi-ciency. The examinations performed were a panoramic radiograph 1 mm to a maximum of 9 mm, with a mean increase of and a MRI of the TMJ with the mouth both opened and closed on 4.9 mm, passing from an initial mean value of 36.5 mm to the sagittal and coronal planes.
41.4 mm at the end of treatment. At 1 month, opening re- Before proceeding with the infiltration, various parameters mained at a mean value of 42.7 mm, and at 3 months, it were assessed, such as the maximal mouth opening, the sidewaysmovements of the jaw, the presence of pain at rest and when chew- was 42.5. At 6months, the mean value reached 41.9 mm, ing food (assessed by VAS), masticatory efficiency and the func- slightly lower than the mean values at 1 and 3 months, but tional limitation level during usual jaw movements [8, 11, 14, 15].
still higher than the initial mean values. The maximal The technique used to perform arthrocentesis of the TMJ (Fig. 1) mean opening value was achieved 1 month after therapy, employs the same reference points as are used in arthroscopic ex-amination . The skin surface is disinfected with povidone io- and at 6 months, the mean value was still higher than the dine. Local anaesthesia is then achieved with mepivacaine 2% value obtained at the end of treatment (see Fig. 2). Statis- (Carbocaine). The anaesthetic is first injected into the joint cavity, tical analysis (ANOVA) confirmed that over the course of relaxing this virtual space. Subsequently, the needle is withdrawn time the cycle of infiltrations favours an improvement in gently to the skin surface, thus anaesthetising the soft tissues over mouth opening (P=0.001, P<0.05).
the joint, too. Two 19 G needles are then placed to make entry andexit points for the liquid to be injected that will wash out the entire Sideways movements of the jaw to the left and right joint. The arthrocentesis (with 50 cc of Ringer lactate) eliminates were assessed in terms of time, the side affected by the the catabolytes present in the synovial fluid .
disorder (left, right or bilateral TMJ) and the direction of This procedure may often prove difficult if the inner part of the movement. At baseline, the right side gave a mean value joint shows debris. However, the pressurising effect exercised bythe injection of fluid into the joint is useful in weakening and of 4.9 mm, while mean movement to the left was 4.7 mm.
breaking up any such debris that may be present. Once arthrocen- At the end of the therapy, movement to the right had increased on average by 4.4 mm, reaching a mean valueof 9.3 mm, while the left side had increased by 4.1 mm,reaching a mean value of 8.8 mm. After 1 month, this in-crease had slightly decreased (P=0.000000, P<0.05).
At 3 months, sideways movement had further decreased to a mean value of 8.6 mm on both sides, increasing againafter 6 months to a mean value of sideways movement tothe right of 8.9 mm and to the left of 9.2 mm. Variationsat follow-up showed a range of less than ±1 mm, demon-strating substantial stability in the results obtained.
Pain at rest was present before treatment in five pa- tients and was assessed as a mean VAS value of 1.8. Afterthe treatment, the mean value had decreased to VAS=0.8.
After 1 month, the mean value was VAS=0.2. After 3 months, the mean VAS value was 0.1. At 6 months, ithad slightly increased to 0.5. The statistical significancewas equal to P=0.0169 (P<0.05).
Pain on movement was present in all the patients, with a mean value of VAS=7.8. Symptomatology improved af- Fig. 1 Technique applied
ter treatment in all cases, with a mean value of VAS=1.6.
Fig. 2 The opening of the
mouth improves after each sin-
gle injection, and there is sub-
stantial preservation of time
during the following 6 months
At 1 month, it had improved to a mean value of VAS=1.2.
patients' masticatory efficiency had reached a mean value After 3 months, a mean value of VAS=0.8 had been of VAS=8.7, and at 6 months it had slightly decreased to a reached. The next control at 6 months showed an absence mean value of VAS=8.6 (see Fig. 4). ANOVA showed the of pain in seven patients out of the ten who had received presence of statistical significance in the data obtained treatment, with a mean value of VAS=1.1 (see Fig. 3).
with P=0.00000 (P<0.05).
ANOVA showed the presence of statistical significance in The efficacy judgement of the therapy expressed by the data obtained (P=0.00000, P<0.05).
the patient was measured numerically (0=poor, 1=slight, The patients' masticatory efficiency was assessed be- 2=moderate, 3=good and 4=excellent) after each infiltra- fore treatment and gave a mean value of VAS=5.7, which tion. After the first infiltration, the mean efficacy value meant they had considerable difficulty in eating hard, was 2.4. The mean values increased progressively in the solid food. At the end of therapy, this parameter had no- course of the following sessions. After the fifth infiltra- tably improved, rating a mean value of VAS=7.9. At tion, the mean value was 3.3, and it remained constant at1 month, the mean VAS value was 8.2. After 3 months the 1 and 3 months, after which time it decreased slightly, Fig. 3 Decrease in pain on
movement during the treatment
with five sodium hyaluronate
infiltrations and the situation at
the 6-months follow-up
Fig. 4 Improving in mastica-
tory efficiency, and its substan-
tial preservation at the 6 months
reaching a mean of 3.2 at 6 months after treatment, with a steroids (betamethasone). Both the drugs used reduced statistical significance of P=0.00004 (P<0.05).
painful symptomatology and improved the clinical signs The patients' tolerability judgement of the actual without revealing any statistically significant differences method of administration was then assessed (0=poor, in therapeutic effect. The authors concluded that both 1=slight, 2=moderate, 3=good and 4=excellent). At the drugs were useful and had a significant long-term effect in first session, tolerability rated a mean value of 2.0. The cases of chronic DJD, but they proposed using sodium mean value had increased by the fifth infiltration to 3.1, hyaluronate as the better alternative because of its lesser indicating a decidedly positive pattern, which proved to risk of side effects. In 1991, the same authors, Kopp et al.
be statistically significant with P=0.00526 (P<0.05).
, observed the short-term effects of injections of so- The functional TMJ limitation level was assessed at dium hyaluronate, glucocorticoids and saline solution in baseline (score 0=absent, score 1=slight, score 2= moder- patients presenting TMJ rheumatoid arthritis. In all cases, ate, score 3=intense and score 4=severe), and it rated a they observed a significantly positive effect in the patients mean score of 2.8. After therapy it had reached a mean treated with sodium hyaluronate or with glucocorticoids.
value of 1.3. At 1 and 3 months, the patients presented a Subsequently, in 1993, Bertolami et al.  used sodium mean value of 1.1, which reached a minimum at 6 months hyaluronate to treat some intracapsular disorders (degen- with a mean value of 0.8. In the case of this parameter, erative disease, reducing and non-reducing disc displace- too, statistical analysis showed the presence of signifi- ment), and they observed that the use of sodium hyaluro- cance with P=0.00000 (P<0.05).
nate significantly improved the clinical signs and symp-toms when compared to saline solution, which had beenused on other patients.
Fader et al.  proposed pressurised infusions of so- dium hyaluronate into the TMJ (pumping technique) to The use of sodium hyaluronate was first described by Ry- treat cases of persistent and symptomatic closed-lock, dell and Balazs  and by Helfet  in the treatment of demonstrating a short-term benefit with regard to sympto- patients suffering from osteoarthrosis. Many studies con- matology and function.
ducted from the 1970s onward on osteoarthrosis of the knee Sato et al.  proposed its use in cases of non-reducing [2, 10, 11, 12, 13] demonstrated that sodium hyaluronate displacement of the disc as an alternative therapeutic helps to alleviate pain, improve functionality and reduce treatment, obtaining an overall improvement in clinical joint crepitus. This substance opens up a new therapeutic signs and symptoms despite the fact that the displacement approach, and the authors recommend the use of cycles of five infiltrations [10, 19] to be given at weekly intervals.
In a 1997 study, Hirota  showed that the injection This approach is preferable to the use of NSAIDs and corti- of sodium hyaluronate in patients presenting joint dys- sone drugs, which are not without undesirable side effects.
function reduced the quantity of catabolytes present in the In 1985  and in 1987 , Kopp et al. likened the synovial fluid (metabolites of arachidonic acid and cyto- short- and long-term effects of the intra-articular injection kines) and improved painful symptomatology and mouth of sodium hyaluronate to that achieved with cortico- The main indications for the use of this substance in the literature that warn of the possible risks linked with therefore proved to be traumatic and degenerative joint this surgical practice [26, 27].
pathologies. Intra-articular administration in degenerative It has been demonstrated that the TMJ behaves in a disease normalises the viscoelasticity of the synovial fluid similar way to the other joints that orthopaedic specialists and activates the tissue repair processes in the cartilage commonly treat with sodium hyaluronate, especially in terms of symptomatology and long-term functionality.
The results of our study show the efficacy of treatment Patients tolerate intra-articular infiltrations well, even administered as a cycle of five intra-articular infiltrations though in some cases they may experience numbing of the of Hyalgan. A single injection can be more useful to solve facial nerve for the first few hours, this effect being linked a dislocation of the disc than to treat a degenerative with the use of Carbocaine.
pathology. An improvement was observed in the range of This method of infiltrating sodium hyaluronate to treat mouth opening and sideways movements, a decrease in DJD has been widely used in orthopaedic practice for painful symptomatology at rest and during movement, an some time, and it is to be hoped that it will gain ground in increase in masticatory efficiency, a progressive decrease maxillo-facial surgery as a possible alternative to treat in functional limitation and an increase in the parameters sufferers who have not responded to conservative medical of efficacy and tolerability of the treatment. The increase in mouth opening is undoubtedly due to a mechanical ef-fect of the liquid injected into the joint. This liquid deter-mines an increase in the hydraulic pressure with conse- quent expansion of the intra-articular space, an effectwhich probably also causes the removal of any debris that 1. Marshall KW (1997) The current status of Hylan therapy for the treatment of osteoarthritis. Today's Therapeutic Trends 15: may be present. This pressurising effect is associated with: (1) the elimination of pain by the infiltration of the 2. Marshall KW (2000) Intra-articular hyaluronan therapy. Cur- local anaesthetic that is activated at the time of treatment; rent Opinion in Rheumatology 12: 468–474 (2) the use of Ringer-lactate lavage solution, which re- 3. Balazs EA, Denlinger JL (1993) Viscosupplementation: a new concept in treatment of osteoarthritis. J Rheumatol 20 [Suppl moves the intra-articular catabolytes and (3) sodium hyal- uronate, with its analgesic, anti-inflammatory and lubricat- 4. Weiss C, Balasz EA, St Onge R, Denlinger JL (1981) Clinical ing properties. Therefore, the improvement in symptoma- studies of the intra-articular injections of Helon (sodium hyal- tology and function is linked at first with the pressurising uronate) in the treatment of osteoarthritis of human knees.
Semin Arthritis Rheum 11: 143–144 effect and the removal of catabolytes, and it is subse- 5. Namiki O, Toyoshima H, Morisaki N (1982) Therapeutic effect quently maintained by the action of sodium hyaluronate of intra-articular injection of high molecular weight hyaluronic and by the patient's regular physiotherapy exercises after acid on osteoarthritis of the knee. Int J Clin Pharmacol Ther Toxicol 20: 501–507 As regards painful symptomatology at rest, it should be 6. Peyron JG (1993) Intra-articular hyaluronan injections in the treatment of osteoarthritis: state-of-the-art review. J Rheumatol noted that five of the patients were asymptomatic at the 20 [Suppl 39]:10–15 beginning of treatment and remained so after the cycle of 7. Yustin D, Kryshtalskyj B, Galea A (1995) Use of Hylan G-F 20 infiltrations, indicating that this technique is not damag- for viscosupplementation of the temporomandibular joint for ing to the joint, is a reliable method and, provided it is the management of osteoarthritis: a case report. J OrofacialPain 9: 375–379 performed correctly, does not cause any iatrogenic dam- 8. Sato S, Ohta M, Ohki H, Kawamura H, Motegi K (1997) Effect age to the joint, either traumatic or infective.
of lavage with injection of sodium hyaluronate for patients Statistical analysis (ANOVA) of the results confirmed with nonreducing disc displacement of the temporomandibular their validity, giving statistically significant P-values for joint. Oral Surg 84: 241–244 9. Sato S, Sakamoto M, Kawamura H, Motegi K (1999) Disc po- all parameters.
sition and morphology in patients with non reducing disc dis-placement treated by injection of sodium hyaluronate. Int JOral Maxillofac Surg 28: 253–257 10. Dougados M, Nguyen M, Listrat V, Amor B (1993) High mol- ecular weight sodium hyaluronate (hyalectin) in osteoarthritisof the knee: a 1 year placebo controlled trial. Osteoarthritis Car- The results of our study demonstrated that arthrocentesis tilage 1: 97–103 with the infiltration of sodium hyaluronate is a valid 11. Huskisson EC, Donnelly S (1999) Hyaluronic acid in the treat- method of treating TMJ degenerative disease. In particu- ment of osteoartritis of the knee. Rheumatology 38: 602–607 lar, a decrease in pain and an improvement in functional- 12. Altman RD, Moskowitz R (1998) Intra-articular sodium hyaluronate (Hyalgan) in the treatment of patients with osteo- ity of the jaw were observed. Function improved well ini- arthritis of the knee: a randomized clinical trial. J Rheumatol tially and then slowly and progressively declined, indicat- ing the need to repeat the cycle of treatment with sodium 13. Frizziero L, Govoni E, Bacchini P (1998) Intra-articular hyaluronate over time.
hyaluronic acid in the treatment of osteoartritis of the knee:clinical and morphological study. Clin Exp Rheumatol 16: Although infiltration is a slightly invasive method of administration, it proved to be absolutely reliable if cor-rectly performed, and was not the source of any iatrogenicdamage in our patients, even though there are case reports 14. Bellamy N, Kirwan J, Boers M, Brooks P, Strand V, Tugwell 22. Kopp S, Akerman S, Nilner M (1991) Short-term effects of in- P, Altman R, Brandt K, Dougados M, Lequesne M (1997) Rec- trarticular sodium hyaluronate, glucocorticoid, and saline injec- ommendations for a core set of outcome measures for future tions on rheumatoid arthritis of the temporomandibular joint. phase III clinical trials in knee, hip, and hand osteoarthritis.
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