Sports Injuries & Medicine (ISSN: 2576-9596)

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A Combination of Tisseel Fibrin Glue and Orthokine ACS improves Knee Meniscus Injury Treatment and helps Avoid Surgery 4-year follow-up Archive Study

Authors: Rudolf W Strümper*, Julio Reinecke, Johann W Rechmeier, René Schilling, Peter Wehling

*Corresponding Author: Rudolf W Strümper, Privatpraxis Orthopädie im Rheinauhafen, Cologne, Germany.

Received Date: 05 December, 2021

Accepted Date: 16 December, 2021

Published Date: 23 December, 2021

Citation: Strümper RW, Reinecke J, Rechmeier JW, Schilling R, Wehling P (2021) A Combination of Tisseel Fibrin Glue and Orthokine ACS improves Knee Meniscus Injury Treatment and helps Avoid Surgery 4-year follow-up Archive Study. Sports Injr Med 10172. DOI:


Background: The routine use of biological therapies with potentially regenerative augmentation of tissue repair is reality. Techniques applied include stem cells, platelet preparations, recombinant growth factors and autologous conditioned serum (ACS), partly in combination with other techniques such as matrices, surgery and fibrin glue. ACS contains blood cell released factors which have the potential to improve tissue repair or regeneration.

Aim: Retrospective analysis of clinical data of intra-articular fibrin glue fixation combined with ACS injections in clinical cases of routine outpatients presenting with knee pain and MRI- confirmed meniscal defects.

Methods: An established intra-articular injection treatment method for osteoarthritis involving autologous conditioned serum (ACS) was routinely employed. ACS is prepared from patient’s blood subjected to extended coagulation at physiologic temperature. The serum supernatant is separated from cellular components by centrifugation. A dedicated medical device (EOT®II, Orthokine) is employed. Outpatients (n = 170), with lesions of the knee meniscus of heterogeneous genesis, severity and duration, were treated with fibrin glue to fixate the tissue injury followed by weekly intra-articular ACS injections (up to 6). Average age was 55.29 years (SD ±12.48) (range 14-84). Follow ups extend from baseline up to 4 years. Clinical effects are documented by WOMAC score at baseline, 6 weeks and yearly intervals. All analyses were performed from archived patient files.

Results: 8 of 170 patients chose surgical treatment of the meniscal injury. 162 patients avoided surgery during the period analyzed. Mean WOMAC global score improved from 34.62 (SD ± 18.48) to 13.18 (SD ± 9.52) (p = 0.0015) at 4 years.

Conclusion: This archive evaluation of a heterogeneous real-life cohort suggests that intra- articular fixation of meniscus injuries with fibrin glue followed by 4 i.a. ACS/BCS injections improves knee symptoms associated with meniscal injury. Controlled studies of Fibrin Glue + ACS treatment for meniscal lesions are advocated.


Knee injury is a major risk factor for the development of knee OA. The OA risk after knee injury goes up 4-6- fold [1]. Numbers of acute meniscus injuries per 1000 inhabitants per year range from 0.5 to 0.7. This relates to stable knees. Instable knees’ percentage goes up to 96 % depending on the case.

Meniscal tears are a common knee injury often related to sports activities. Among US high school athletes more than 20 % of all knee injuries are meniscus injuries. Other publications looking at different cohorts find > 10 % rates [2,3]. Knee injuries in general are significantly more likely to be treated with surgery than all other injuries. Hence, most meniscal injuries tend also to be treated surgically (> 60 %) [4]. Interestingly [2] points out that a vast number of sports injuries may not be treated appropriately. Since then (2000) this may have improved, advanced imaging techniques have improved in quality and become more easily accessible [5].

The 2019 ESSKA meniscus consensus [6] recommends surgery as early as possible when repair is required, preservation of the meniscus being the main intention of therapy by surgical repair. Biological augmentation (e.g. ACS, PRP, Stem Cells) was not embraced for lack of consistent evidence.

Nonetheless ESSKA published an Instructional Course Lecture Book featuring a chapter on Biological Therapies in Orthopedics and Sports Medicine [7]. This emphasizes the fact that there is high interest in biologically augmented meniscus repair.

Preservation of the meniscus has been attempted with locally applied fibrin glue [8]. Limited evidence exists for the use of autologous fibrin clots [9, 10]. However, these techniques have not been widely adapted in the clinical community. Fibrin glue stability as a “cast” is limited to weeks and the clinical results obviously were not convincing.

Autologous conditioned serum in meniscal tears

We have described a technique using autologous conditioned serum (ACS) also known as blood cell secretome (BCS) as augmentation to improve symptoms and structural damage related to meniscal tears without prior or concomitant surgery. Oxford knee score (OKS) and Boston Leeds Osteoarthritis Knee Score (BLOKS) were applied in 47 outpatients and documented significant improvements for both scores [11]. Other studies have shown the efficacy of BCS mostly in Osteoarthritis but also in Tendon and Muscle healing (soft tissue) (XXX). ACS/BCS efficacy in Back pain resulting either from Facet OA or nerve root inflammation has also been published (XXX).

Autologous conditioned serum combined with fibrin glue in meniscal tears

In our office so far a total of  > 500 cases of injured knee menisci have been treated routinely with fibrin glue locally applied by MRI guidance. Subsequently patients received ± 4 injections with ACS in weekly succession.

The rationale of this protocol is that Fibrin glue is able to fixate the meniscal wound, bringing the margins in close vicinity. Similar to arthroscopic suturing or pin fixation this aims at facilitating cellular healing. In a damaged joint the milieu often is inflammatory/catabolic. Augmentation with ACS/BCS has shown to be inflammation resolving, to improve healing in a number of experimental and clinical studies with degenerative and acute tissue injuries. It should be capable to support healing more efficiently if the margins of a meniscal wound are kept in close contact long enough to enable cellular contact/healing and junction. This procedure was performed in a setting that avoids anesthesia and surgery. It may be suitable for a subset of injuries where surgical intervention is not strictly necessary.

Materials and Methods


Outpatient files with a diagnosis of meniscal lesions who had undergone Tisseel plus Orthokine BCS treatment were included in this archive study. All patients had pain, effusion and loss of function of the index knee before treatment.

Data were obtained in compliance with German law and the Declaration of Helsinki, and the authorized ethical committee cleared this retrospective study (U1111-1268-5097, No 276/2021) for the period 2016-2020. Patient anonymity has been carefully protected in the analysis and data analysis. This study meets the ethical standards of the journal. 170 cases of which full score documentation were available and included in this analysis.


ACS/BCS was prepared with venous blood drawn with the Orthokine device (EOT®II-syringe, Orthogen Lab Services, Germany), which contains medical grade glass spheres. Patients’ blood was subjected to extended coagulation in the device for 6 hours at 37 ° C. Serum was then recovered by centrifugation and injected into the patient’ joints at weekly intervals. The conditioned, cell-free serum is rich in Growth Factors IGF, TGFb, EGF, FGF, PDGF and Cytokines IL-1Ra and smaller amounts of IL-1b, IL-6, TNFa [33].


The fibrin adhesive system (Tisseel; Baxter Deutschland GmbH, Germany) is composed of solutions A and B. Solution A is made up of purified fibrinogen and aprotinin. Solution B includes thrombin and CaCl2. It is applied via a double syringe and the 2 components only mix right at the tip of the cannula.


MRI Airis Vento (Hitachi) is an open device with coils that allow interventional access. Routinely the following sequences are used.


The intervention for the application of the fibrin glue takes place in the prone position of the patient with positioning of the intervention coil at the knee joint. After extensive disinfection of the target area and sterile draping, the personnel are equipped with surgical gowns, sterile gloves, surgical masks and surgical head covers. Local anesthetic (5-10 ml 2% Mepivacain) is injected into the popliteal region. A MRI-qualified injection-needle 22 G x 100 mm (KIM-22/10, ITP GmbH, Bochum, Germany) is introduced into the meniscal injury under local anesthesia. The needle position is checked by short MRI sequences in all planes. When the correct needle position in the meniscus is reached, MRI-grade contrast medium Dotarem (Gd-DOTA) (0.5 - 1 mL) is injected via the positioned needle to assess the spread in the joint. When contrast medium appears in or immediately adjacent to the injury on the control MRI sequences the patient is placed in the supine position and the fibrin glue is injected though the same (saline washed) cannula. Passive knee-motion from 0 to 60 degrees is manually applied to avoid any unintended adherences. Fibrin glue reaches full strength by 2 min. After sterile bandage the patient is allowed to stand up. The patient is encouraged to put full weight on the index leg and walk independently to a rest area for 30 min observation. Patients are encouraged to use crutches on the day of the procedure. After 6 weeks MRI-Control and begin with normal activities and muscle training. ACS/BCS injections (2 mL each) are started at 1 week post Tisseel application and repeated weekly until 4 injections.


Standard patient documentation included age, sex, classification and position of meniscus tear, classification of OA status according to Kellgren & Lawrence. Diagnostic MRI was not performed at follow up dates. Cases of injury on both knees were counted as separate cases.

Timepoints of documentation are routinely requested at baseline with follow up 6 weeks, 1, 2, 3 and 4 years. Our clinic setup is not to perform studies, rather to perform therapy on out-patients. Documentation or follow up are dependent on the patients’ free decision to comply with regular assessment. In this cohort the first patient started treatment 2016-08-12 and last patient started treatment 2020-05-06. This means that in addition to observed drop outs only a limited number of patients have reached the longer follow ups.


The basic idea for this retrospective follow-up study was to generate data for proof-of-concept reasons in the indication knee meniscus injury. On the basis of the present study, new hypotheses can be generated and sample size calculations for future studies performed.

For this reason, the statistical analysis was performed exploratory with descriptive methods. This includes frequency tables, mean, standard deviation and effect size. Since the study is monocentric and therefore not necessarily representative, we omitted inferential statistics in order not to trigger potentially false expectations due to significant p-values. Nevertheless, the very high effect sizes seem to show a clinically relevant impact of ACS, which definitely needs to be revised in future, controlled studies.


This is an open anonymized case series analysis of patients treated in routine practice. We had no incentive for patients to come back and take a WOMAC questionnaire. Also several patients had not reached the later follow up dates. Some cases required repeat interventions due to failed meniscal healing or reinjury (n = 13). 8 of those had a medium size tear, 4 had had previous surgery, 1 had a complex tear.

WOMAC global, -pain, -stiffness and –function present similar outcomes. There is a substantial improvement of symptoms within 6 weeks post therapy, which remains stable up to 4 years.

Effect size of changes vs baseline are substantial (Figures 1-4). There were no complications during treatment except 1 hematoma. 8 patients required surgery so   far.

Patients with meniscus injuries are routinely treated with a fibrin glue cast of the defect. At 1 week after fibrin glue a series of ± 4 ACS/BCS is started in order to augment meniscal healing. WOMAC questionnaires are routinely filled in by out-patients at 1st visit, 6 weeks’ control and at yearly follow up visits. For WOMACglobal and the 3 sub scores pain, stiffness and function we see a uniform drop of mean values. Significant changes vs baseline are marked with *= p < 0.05 ** = p < 0.01


Location and quality of the injuries treated. 1 bucket handle was treated because it could be repositioned, no follow up was obtained. 2 root tears were treated, no follow up was obtained. From 11 radial tears no follow up was obtained. Small to complex and radial tears did contribute to follow up.

Discussion Interpretation

The data presented here demonstrate that Tisseel fibrin glue casting of meniscal injury followed by BCS/ACS intra-articular injections may improve clinical symptoms as determined by WOMAC questionnaire. Effect sizes detected are substantial.


Meniscus repair surgery has the overarching goal to facilitate tissue regeneration. At present not all cases eligible are treated with repair surgery, and not all cases are eligible for repair surgery. Generally, it is also true that objective healing of a surgically repaired meniscus is often not satisfactory judged from MRI [12-14]. Nonetheless, clinical outcomes often are good. Success of repair surgery is often dependent on skill, location and severity of injury and repair should be performed when possible, particularly in younger patients [15,16].

Repair of tissues can alternatively be facilitated by Fibrin glue, which can hold wound edges close long enough to allow for cellular re-joining. This has been tested and used in tendon repair for several decades [17-19]. Re-attachment of bony intesional structures have also been described [20]. Bösch et al. found no statistically significant mechanical difference between sutured/glued and sutured only rabbit tendons [21]. Thermann et al. found similar results [22]. Winter and others however confirm that fibrin glue is used routinely in surgery [23-27]. Recently, this approach has been re-discovered [28-31], albeit some -now- with growth factor augmented fibrin glue.

Here, we augmented fibrin glue treatment with autologous factors derived from blood. The advantages of ACS/BCS augmentation are: easy to obtain, 100% autologous, combination of multiple blood borne growth factors known to be involved in tissue regeneration in physiological concentrations and proportions [32,33]. Other factors identified in ACS/BCS include growth factors, cytokines, lipid mediators, extracellular vesicles and components ameliorating oxidative stress. ACS/BCS has a long successful track record for joint and soft tissue injection [33, 34-39] and joint pain reduction [40-45]. It induces stem cell activation in vitro [46] and in vivo [47], regeneration of tissues (tendon) and promoting intra-articular homeostasis [40, 48-51]. Last but not least, bone lysis in bone tunnels after ACL reconstruction is reduced [52] which fits well with unpublished reports of bone-edema and – fracture improvement. These items are compatible with an ACS/BCS triggered Macrophage M1->M2 shift expressing itself by IL-1Ra upregulation, IL-1b downregulation, Nitric Oxide downregulation, Reactive Oxygen Species downregulation, Hyaluronic Acid Synthase upregulation in vivo [51]. A hypothesis of mode of action therefore includes anabolic effects supporting the healing process, reduced oxidative stress and immune cell (e.g. Macrophages) triggered alarm signaling, resulting in pain and function improvement.

A recent review presents an overview of some of the issues of neuropathic pain involvement in musculoskeletal injuries/diseases and regenerative pain medicine [52]. Osteoarthritis pain [53-57] and meniscal injury pain are being discussed in the context of neuropathic characteristics [58,59]. Given the strong evidence of ACS/BCS efficacy in chronic radiculopathy [37,38] it is possible that a component of the data shown here and in [11] result from an amelioration of a neuropathic component.


The evidence we present here supports a previous publication that showed good clinical evidence when meniscal injury was treated with ACS/BCS alone and documented by patient based OKS and MRI based BLOKS scores [11]. However, the data here include no anatomical (e.g. MRI, second look) evidence. But, WOMAC scores confirm clinically advantageous outcomes. First results were presented at the ICRS Focus Meeting in 2018. The technique combines temporary fixation as an alternative to surgical fixation of the injured tissue with anabolic augmentation and promotion of an improved joint homeostasis [51]. Since this is a case collection from clinical practice the data lack the rigor of an RCT. Also, the drop-out rate was substantial. This is mostly attributed to the fact that many patients do not feel the voluntary urge to return for a follow-up appointment. Others started late with the treatment and therefore were not advanced to late follow-up. Last but not least, part of the planned follow-ups fell in the time of the florid COVID-19 epidemic. Therefore, we suggest an adequate clinical study to confirm these promising data.

In our clinic satisfaction with the outcomes of the described procedure is high. More than 500 cases have been treated with only a part of them presenting full documentation (WOMAC). Currently we have 11 four-year follow-ups and are continuing data collection.

The main advantages of this approach include: no surgical risk, no risk from general anesthesia, no irradiation, no thrombosis, no need for hospitalization, meniscus can be preserved, leaks of proteolytic enzymes from damaged meniscus cells are sealed, no immobilization and no muscle atrophy. If the technique fails, no obstacles stand in the way of surgery.

The main disadvantage is that it is not suitable for all meniscus injuries (mainly those with a significant dislocation). The technique is dependent on the spatially correct delivery of the fibrin glue. This is influenced by the injury’s localization and its proper imaging. The efficacy of the local anesthesia is also of importance since the Tisseel application inside the injury can be painful.


























Cases available for analysis at baseline











K&L grading 0-4



repeat 0-3



Table 1: Baseline characteristics of patients. LM: lateral inury; MM, medial injury; K&L Kellgren and Lawrence grading. Of 170 cases 13 required repeat treatment for unsatisfactory improvement of symptoms or re-injury.

6 weeks

1 year

2 years

3 years

4 years






Table 2: Cases available for analysis at the follow-up time points.



Lateral meniscus


Medial meniscus



Follow-up not


Small tear



14 (8,2%)


Medium tear



68 (40,0%)


Complex tear



58 (34,1%)


Radial tear



11 (6,5%)


Bucket handle



1 (0,6%)


Previous surgery



16 (9,4%)


Root tear



2 (1,2%)







Table 3: Classification of meniscal tears treated in this series.


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