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Bone Grafts andBone Graft Substitutes
https://t.me/medicina_free
RobertMorrison
12
12.1 Introduction and Core Messages
Bone grafts or substitutes are used in spinal surgery to
ll defects, to bridge defects or to promote spondylodesis. The physiological process is similar to that of
fracture healing and incorporates the same spatial and
temporal factors. The ideal material should provide
osteogenetic, osteoinductive and osteoconductive
properties. The traditional autologous bone grafts are
probably still considered the “golden standard”, but
the problems associated with them bring up the need
for substitutes. One alternative is the acquirance of
allogenic or xenogenic bone grafts, which have specic problems of their own, which limit their use. The
other aspect is the use of bone substitutes, which come
in a growing variety of materials, shapes and application forms. Currently, none of these substitutes unite
all of the prerequisites shown above, but they have the
advantage of unlimited supply without causing additional problems such as donor site morbidity. And the
combination of such substitutes as scaffold with the
utilization of growth factors and mesenchymal stem
cells brings with them a completely new array of
possibilities.
12.2 Denition
12.2.1 Bone Graft
The bone is harvested from different parts of the patient. It is
most commonly from the iliac crest but also from the vertebral structures, the ribs, the tibia as well as the bula [1].
R. Morrison (*)
Spine & Scoliosis Center, Asklepios Klinik Bad Abbach, Germany
e-mail: dr.morrison@web.de
12.2.2 Bone Graft Substitute
It replaces the autologous bone in order to achieve defect
lling and bridging and also fusion [2]. It provides unlimited
supply and eliminates donor site morbidity. But no substitute
provides the combination of osteoinductive, osteoconductive
and osteogenetic properties [1].
12.3 Physiology ofBone Regeneration
The bone is one of the few organs that retains the potential
for regeneration throughout life. In contrast to other organs,
the bone does not repair defects with scar material of poor
quality but rather reinstates its original values. But fracture
healing and therefore also bone regeneration are complex
physiological processes.
Two basic principles of bone healing are described in lit-
erature [3] as follows:
• Primary bone healing (“direct healing”) is very rare and
not the usual form of healing achieved in spinal surgery.
• Secondary bone healing involves intramembranous and
endochondral ossication and leads to callus formation.
Callus formation is achieved through undifferentiated
multipotent mesenchymal stem cells (MSCs) and requires
cell vitality and blood supply.
In this cascade of bone regeneration, certain prerequisites
are known. Most importantly, a vital cell population has to be
present. MSCs have to be either present or transferred to the
site via blood supply. These cells are transferred to a cell
population with osteoblastic phenotypes.
In addition, the fracture haematoma offers a vast supply of
signalling molecules (ILs, TNFs, TGFs, VEGF) to induce
healing. Within the group of TGFs, the so-called bone morphogenetic proteins (BMP-2, BMP-7) have been extensively
studied and shown to play a decisive role in the healing process
[4]. The third important element is the extracellular matrix,
providing a natural scaffold for the cellular interactions. This
© Springer-Verlag GmbH Germany 2023
U. Vieweg, F. Grochulla (eds.), Manual of Spine Surgery, https://doi.org/10.1007/978-3-662-64062-3_12
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Osteogenic
cells
Diamond
concept
Mechanical
vironment
Fig. 12.1 “Diamond concept” regarding bone healing [5]
Osteoconductiv
scaffolds
Growth
factors
R. Morrison
supply of the cancellous as well as cortical bone (tricortical
graft) (Figs.12.2 and 12.3).
Advantages
• Osteogenetic
• Osteoconductive
• Osteoinductive
Disadvantages
• Limited supply.
• High failure rate is reported.
• Risk of iliac crest fracture (Fig.12.4).
• Correctional loss due to remodelling [6].
• Donor site morbidity (limited with correct utilization).
• Additional operation time.
Harvest sites
• Iliac crest (anterior, posterior)
• Locally (vertebral body, spinous process, lamina, etc.)
• Rib portion (in transthoracic approaches)
• Tibia/bula
can be replaced by an immense number of osteoconductive
materials such as allografts, demineralized bone matrix
(DBM), hydroxyapatite and calcium-based ceramics, among
others. These scaffolds have been shown to have an optimal
pore size of 150–500μm. The last important factor, important
for fracture healing and bone formation, is the mechanical stability. All four components combined are described as the
“diamond concept” (Fig.12.1). It is well described in extremity fractures and of equal importance in spinal surgery [5].
12.4 Clinical Application
Therefore, bone or bone substitutes should preferably have
the three properties mentioned above. Osteogenicity refers
to the fact that they contain osteoblastic cells and are thereby
capable of directly forming the bone. Osteoconductivity
refers to the situation in which they provide a structure along
which osteoblasts can attach and thereby the bone can grow.
Osteoinductivity is the ability to induce nondifferentiated
stem cells or osteoprogenitor cells to differentiate into osteoblasts. A “perfect” bone graft substitute would incorporate
all three characteristics.
12.5 Autologous Bone Grafts
The “golden standard” of bone grafts is the autologous bone,
although it is an area of growing controversy [1]. It is mostly
harvested from the iliac crest, depending upon positioning of
the patient. This donor site has the advantage of having a
12.6 Surgical Technique ofIliac Crest Graft
Harvesting
The bone from the iliac crest can be easily harvested. When
choosing the anterior crest, one must be aware of the lateral
femoral cutaneous nerve. On the other hand, a safety margin
of at least 3 cm should be left from the anterior superior
crest, where the hip exion muscles derive from. We recommend harvesting the graft using a double-blade oscillating
saw. The desired depth can also be harvested using a “graft
cutter”. This way a dened cortical graft is obtained, leaving
room for additional harvesting of cancellous bone chips
using a spoon. The defect is lled using a haemostatic pad,
the fascia is closed and a drain should be placed to prevent a
painful haematoma. Alternatively, according to the clinical
application, “bone plugs” can also be harvested using special
instruments (Fig.12.5). This leaves less defect and can also
be harvested in other locations.
12.7 Bone Graft Substitutes
These materials should ideally have the osteogenetic, osteoconductive and osteoinductive characteristics of an autograft without the substantial side effects. Most of these
materials only provide osteoconductivity. Their integration
into the bone substance can take place in different ways [7].
One way is the direct integration or resorption followed by
conversion into the bone. The other way would be some
kind of “graft- versus- host reaction” resulting in a self-contained graft or even a (partial) loss of graft substance without integration [8].

12 Bone Grafts andBone Graft Substitutes
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Fig. 12.2 CT scans in three planes documenting the correct size and positioning of a tricortical autograft
79
Fig. 12.3 Plain radiograph of a monosegmental, anterior spondylode-
sis with a tricortical iliac crest autograft following bisegmental, posterior stabilization
12.8 Allografts
This relates to the tissue taken from one person for transplantation into another. This type of treatment has spread due to
recent improvements in procurement, preparation and storage. Clinics with a high turnover of allografts have their own
storage areas. This concept of bone banking is connected to
a great deal of legal issues, showing great variations in different countries [9]. They are useful however to enlarge the volume of the autologous bone.
Fig. 12.4 Iliac crest fracture following bone harvest from the anterior
iliac crest in the right side
Advantages
• Osteoconductive
• Unlimited supply
• Multiple shapes and sizes
• No donor site morbidity
Disadvantages
• Not osteogenic (due to chemical processes in the
making)
• Weak osteoinductive properties
• Possibility of infectious disease transmission

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R. Morrison
Fig. 12.5 Bone graft harvesting set (Synthes) used for different sizes of “plugs” (© by Synthes)
12.9 Demineralized Bone Matrix (DBM)
andBone Morphogenetic Protein
(BMP)
DBM is a demineralized allograft bone with osteoinductive
activity [10]. Demineralized bone matrixes are prepared by
acid extraction of the allograft bone, resulting in loss of most
of the mineralized components but retention of collagen and
noncollagenous proteins, including growth factors. The efcacy of a demineralized bone matrix (DBM) as a bone graft
substitute or extender may be related to the total amount of
bone morphogenetic protein (BMP) present and the ratios of
the different BMPs present. The multitude of different BMPs
are all capable of recruiting bone-forming cells and encouraging local cells to aid in the bone formation process. There are
up to now over 20 different BMPs known, but the clinical
research is currently limited to BMP-2 and BMP-7. The different types of BMPs seem to show substantial variations in their
osteogenetic potency. Recently, BMP has been associated
with cancer, but further studies have found no correlation [11].
Advantages
• Osteoinductive with promoted bone formation [12].
• Osteoinductive potency is very variable in different prod-
ucts [4].
• Graft extender (in combination with autografts).
Disadvantages
• Poor structural integrity
• BMP alone not osteoconductive
12.10 Hydroxyapatite (Ca10(PO4)6(OH)2)
andTricalcium Phosphate (Ca3(PO4)2)
These substitutes are mainly known as bone void llers.
Taking into account their specic strengths (e.g. fast curing,
uid injection, etc.) and their weaknesses (low shear stress,
poor biodegradability, etc.), new applications have arisen.
These materials come in a wide array of different application
forms (Fig.12.6).
Advantages
• Osteoconductive (Fig.12.7)
• Lasting stability
• Availability
Disadvantages
• Not osteoinductive
• Not osteogenic

12 Bone Grafts andBone Graft Substitutes
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Fig. 12.6 An array of different forms and shapes used in calcium phos-
phate bone substitutes (© by Synthes)
81
a
b
Table 12.1 Exemplary list of calcium phosphate products on the mar-
ket (among others)
Product Company Type
Nanostim Medtronic Synthetic tricalcium
BoneSource Howmedica CaP cement
Alpha-BSM DePuy CaP cement
Calcibon Biomet/Merck CaP putty
MIMIX Biomet Synthetic tricalcium phosphate
Cerasorb Curasan Beta-tricalcium phosphate
ChronOS Synthes Beta-tricalcium phosphate
Vitoss Orthovita Beta-tricalcium phosphate
Pro osteon Interpore cross Coralline hydroxyapatite
Endobon Biomet/Merck Cancellous hydroxyapatite
BioFuse Corin Hydroxyapatite/CaP
Actifuse ApaTech Silicated calcium phosphate
12.11 Clinical Application
Current evolutions within this eld, such as biphasic, injectable CaP and silicated CaP, widen the array of applications,
offering a good supplement in achieving spinal fusion [13]
(lling cages, lining cages, extending grafts, etc.)
(Table12.1). These substances should be rehydrated using
the patients’ blood before applying (Fig.12.8).
Fig. 12.7 (a, b) Histological ndings using chronOS mixed with blood
6weeks (a) and 12weeks postoperatively (© by Synthes)
Fig. 12.8 ChronOS blocs mixed with blood (© by Synthes)

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R. Morrison
12.12 Other Ceramics (Sea Corals, Calcium
Sulphate)
These substances are currently researched to evaluate their
usefulness to supplement or even replace the ceramics in use
today.
12.13 Outlook
Tissue engineering and the further development of growth
factors offer great potential for the future of fusion and bone
substitutes. Materials will evolve and offer “ideal” and individual solutions for specic indications [14]. But currently,
the autologous bone is still the golden standard [15]. The
diversity of current substitutes will make further comparative
studies quite difcult.
References
1. Sen MK, Miclau T.Autologous iliac crest bone graft: should it still
be the gold standard for treating nonunions? Injury. 2007;38(Suppl
1):S75–80.
2. Bone Graft Alternatives (according to the North American Spine
Society). http://www.spine.org/Documents/bone_grafts_2006.pdf
3. Phillips AM. Overview of the fracture healing cascade. Injury.
2005;36(Suppl 3):S5–7.
4. Papakostidis C, Kontakis D, Bhandari M, etal. Efcacy of autolo-
geous iliac crest bone graft and bone morphologic proteins for pos-
terolateral fusion of lumbar spine– a metaanalysis of the results.
Spine. 2008;33(19):E680–92.
5. Giannoudis PV, Einhorn TA, Marsh D.Fracture healing: the diamond concept. Injury. 2007;38(Suppl 4):S3–6.
6. Morrison RH, Thierolf A, Weckbach A. Volumetric changes of
iliac crest autografts used to reconstruct the anterior column in
thoracolumbar fractures: a follow-up using CT scans. Spine.
2007;32(26):3030–5.
7. Berven S, Tay BK, Kleinstueck FS, etal. Clinical applications of
bone graft substitutes in spine surgery: consideration of mineralized
and demineralized preparations and growth factor supplementation.
Eur Spine J. 2001;10(Suppl 2):S169–77.
8. Schimandle JH, Boden SD. Bone substitutes for lumbar fusion:
present and future. Oper Tech Orthop. 1997;7:60–7.
9. Friedlaender GE. Bone-banking. J Bone Joint Surg Am.
1982;64:307–11.
10. Petersen B, Whang PG, Iglesias R, et al. Osteoinductivity of
commercially available demineralized bone matrix. Preparations
in a spine fusion model. J Bone Joint Surg Am. 2004;86-A(10):
2243–50.
11. Cooper GS, Kou TD. Risk of cancer following lumbar fusion
surgery with recombinant human bone morphogenic protein-2
(rhBMP-2): an analysis using a commercially insured patient population. Int J Spine Surg. 2018;12(2):260–8.
12. Kwong FN, Harris MB.Recent developments in the biology of
fracture repair. J Am Acad Orthop Surg. 2008;16(11):619–25.
13. Becker S, Maissen O, Ponomarev I, etal. Osteopromotion by a
beta-tricalcium phosphate/bone marrow hybrid implant for use in
spine surgery. Spine. 2006;31(1):11–7.
14. Giannoudis PV, Tzioupis CC, Tsirids E.Gene therapy in orthopaedics. Injury. 2006;37(Suppl 1):S30–40.
15. Morris MT, Tarpada SP, Cho W. Bone graft materials for posterolateral fusion made simple: a systematic review. Eur Spine J.
2018;27:1856–67.

On- andOffline Documentation
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ofSpine Procedures: Spine Tango
ThomasZweig, MarcoTeli, EverardMunting,
SamuelMorris, andMarkusMelloh
13
13.1 Introduction and Core Messages
Today, quality assurance and systematic data collections
are nally becoming more commonplace; however, they
are often independent undertakings of surgeons or hospitals. As a result, the isolated use of databases and content to study smaller groups makes data pooling and
harmonisation difcult and impedes important quality
assurance processes, particularly benchmarking. In
2000, EuroSpine, the Spine Society of Europe, at the
initiative of Dieter Grob and Max Aebi and with the help
of Chris Röder, launched Spine Tango, an on- and
ofine registry of spinal interventions (surgical and conservative) aimed at assuring quality in outcome research
and enabling national and international benchmarking.
A scientic clinical fellowship was introduced to support the distribution on every layer. Spine Tango later
evolved to include postmarket surveillance of surgical
implants. Information on Spine Tango and a battery of
recommended physician and patient-based instruments
can be found under www.eurospine.org—Spine Tango.
T. Zweig (*)
Spine in the Center, Bern/Langenthal, Switzerland
e-mail: spine@hin.ch
M. Teli
The Walton Centre for Neurology and Neurosurgery, Liverpool, UK
E. Munting
Clinique Saint Pierre, Ottignies, Belgium
S. Morris
Centre for Spinal Studies and Surgery, Queen’s Medical Centre,
Stockport, UK
M. Melloh
Institute of Health Sciences, Zurich University of Applied
Sciences, Winterthur, Switzerland
UWA Medical School, The University of Western Australia,
Nedlands, Western Australia, Australia
13.2 Denition ofQuality inHealth Care
To those not involved in quality improvement in a professional capacity, it might appear a relatively simple task to
dene “quality”; however, more than 2000years after Plato
invented this term, there is still great debate regarding the
meaning of the word [1]. The American Society for Quality
(ASQ) denes quality as “a subjective term for which each
person has his or her own denition” [2]. According to a
user-based approach, quality can be dened as “meeting or
exceeding customer satisfaction” [3]. Quality is a multidimensional construct, and the dimensions are specic to each
category. The US Agency for Healthcare Research and
Quality denes quality in health care as “doing the right
thing, at the right time, in the right way, for the right person,
and having the best possible results” [4].
The quality measures in health care assess the following
three components:
• Structure (resources such as staff and equipment)
• Process (therapeutic interventions, prescribing, interac-
tions with patients)
• Outcomes (end results of health care such as mortality
and attainment of patient’s expectations) [4, 5]
Wensing and Elwyn [6] dened preferences as patient’s
ideas about what should occur in health-care systems.
Evaluations are patient’s “reactions” to their experience
of health care, and reports are objective observations (e.g.
how long the patients had to spend in the waiting room).
The measures used to obtain the patients’ view can be
classied into the following three categories:
• Preferences
• Evaluations
• Reports
Naturally, the scope and utility of a quality measurement
process will depend on the choices made when selecting measurement tools. The choice of the type of measure depends on
the aspect being assessed and the purpose of the evaluation
(educational, certication, accreditation, quality control or
quality improvement) [7]. One of the most widespread means
© Springer-Verlag GmbH Germany 2023
U. Vieweg, F. Grochulla (eds.), Manual of Spine Surgery, https://doi.org/10.1007/978-3-662-64062-3_13
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T. Zweig et al.
of measuring processes and outcomes is the assessment of
patient satisfaction (evaluation category). Outcome satisfaction is also one of the criteria for assessing the validity of process measures. Indeed, according to Chassin [8], a measure of
process is valid when it is related to health outcomes (mortality, patient satisfaction, etc.). Hence, the responses to questions concerning satisfaction with treatment, typically used in
treatment outcome studies, can also be seen as outcome measures in the quality control and improvement context.
13.2.1 Overlap ofOutcome Research
andQuality Control
Medical disciplines have adopted the practice of quality control
through data collection and measurement tools, but there is
often less enthusiasm among medical institutions to be guided
by data and implement ndings in a rigorous or systematic
fashion. The growing emphasis on an evidence- based approach
in the medical setting has led to a corresponding increase in the
number and quality of studies in the twenty-rst century, examining the efcacy of surgical and non-surgical treatments.
These studies are usually conducted in university hospitals and
clinics that have an in- house research staff or that cooperate
with academic research institutions. The studies are not commonly perceived by the care provider (hospitals and clinics) as
being something from which they can benet from an economical point of view; in contrast, carrying out such research can
sometimes be seen as a drain of resources. The research activities on treatment outcomes are merely seen as something that
may indirectly benet the institution in terms of prestige and
corporate social responsibility. However, the possibility of economic benet from corporate social responsibility activities is
not a sufciently persuasive argument for increasing investment in research—otherwise, all the public and private hospitals and clinics would likely have their own research
departments or research staff. Signicantly, in all of this, one
important factor is typically overlooked: research projects in
the eld of treatment outcomes and their predictors can be useful to the provider in a much more direct way in terms of quality improvement and the control of service performance [9].
variety of levels, pathologies, accesses and surgical techniques confounds all attempts to formulate a concise yet
comprehensive questionnaire. Under the auspices of
EuroSpine, the Spine Society of Europe, a project was
launched for the design and implementation of a documentation system for spinal surgery in 2000. This effort was introduced as “Spine Tango” and was conducted in collaboration
with the Institute for Evaluative Research in Orthopaedic
Surgery at the University of Bern, Switzerland.
Goals of Spine Tango were the following:
• Presentation of state-of-the-art European spine surgery,
including all pathologies, levels, accesses and single- as
well as multiple-staged surgeries
• Outcome research and prospective observational evalua-
tion of different surgical techniques as an alternative to
randomised controlled trials
• Benchmarking on national and international levels
• Quality assurance and quality improvement
Spine Tango was probably the rst international spine
registry initiative to face the challenge of developing a comprehensive questionnaire covering all major spine pathologies and interventions, as well as spanning all anatomical
levels. To accomplish this task, a technically demanding
computer application was a prerequisite. The consensus and
piloting process for the Spine Tango surgical questionnaires
“surgery” and “follow-up” took about 5years and required
around 4000 completed forms. The results are two doublesided A4 questionnaires (surgery, staged surgery) and one
single-sided questionnaire for follow-up, all of which can be
completed online or using scannable paper questionnaires.
At the same time that the physician-based content was nalised, a working group at the Schulthess Hospital in Zurich,
Switzerland, had developed and validated the COMI (Core
Outcome Measures Index) instruments for neck and low
back pain which became the ofcially recommended patientbased documentation instruments in the framework of the
Spine Tango registry [10]. To date, the Spine Tango database
has grown to over 750,000 cases, and currently, about 40
hospitals participate from 5 continents and will become the
mandatory register in Switzerland and Germany while in the
pilot phase in Belgium [11].
13.3 EuroSpine “Spine Tango”: An
International Spine Registry forQuality
Assurance, Outcome Research,
Postmarket Surveillance ofImplants
andConservative Interventions
13.3.1 History andObjectives
All over the world, efforts are being made to set up surgical
registries on regional, state or even national levels. Spine surgery represents a challenge for all registry endeavours. The
13.3.2 Content: Physician Based
The rened set of questions still allows documentation of the
broad spectrum of pathologies and treatments in spine surgery.
This is made possible by means of a list of main pathologies
and their specications and the so-called surgical matrix, a terminology system reducing the interventions to their basic
principles—decompression, fusion, stabilisation rigid, stabilisation motion preserving, percutaneous procedures and others. The duplication and, hence, separation of these principles
into anterior and posterior ones completes the matrix.

13 On- andOine Documentation ofSpine Procedures: Spine Tango
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Fig. 13.1 SSE Spine Tango surgery form (front and back side). All questions with blue background are mandatory
13.3.3 Surgery Form
the matrix questions need to be completed. Typically, this can
be done with two to four questions. Finally, the “discharge”
The rst half of the front page of the “surgery” form serves to
specify the level of the procedure, admission date, case history (previous conservative and surgical treatments), main
and additional pathology, most severely affected segment and
subform inquires about the discharge date, surgical and gen-
eral in-hospital complications, measures taken and status of
complications upon discharge. It makes up between three and
seven questions (Fig.13.1).
extent of lesion. This information is grouped into the “admission” subform. The “specication of main pathology” subform makes up the second part of page one and comprises one
13.3.4 Staged Surgery Form
to three questions per “main pathology” category. These serve
to provide more information about the main pathology. On
the reverse side of the sheet are the “surgery”, “surgical measures” and “discharge” subforms. The “surgery” subform is
the largest (12 questions) and inquires about surgery date,
implants used, goals of surgery, the surgical matrix, surgeon
credentials, access and technology, operation time, morbidity
state and blood loss. The “surgical measures” subform applies
the same principle as the “specication of main pathology”
subform—only the items relevant to the information given for
In addition to the surgery form, there is also a so-called
staged form and a follow-up form. The staged form serves to
document the second part of a planned two-stage procedures,
that is, procedures where the patient remains in the hospital
between the rst and the second interventions. If the patient
is discharged, a new surgery form must be completed. Also,
if an early revision is carried out, the correct way to docu-
ment this is with a new surgery form with the diagnosis
“failed surgery”.

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Fig. 13.2 SSE Spine Tango follow-up form (one page only)
13.3.5 Follow-Up Form
The follow-up form is just one side of the A4 sheet and consists of a “follow-up” subform and a “complications” subform. In its paper format, it can be completed in less than
1min. After the date of follow-up and the follow-up interval
have been completed, the patient’s work status is documented, and the surgical goals that were achieved, partially
achieved or not achieved at all are indicated. Only the surgical goals that are indicated on the surgery form are to be
considered. Current medication, rehabilitation and the surgeon’s rating of the outcome are then recorded. The last
question in the “follow-up” subform inquires about the need
(or not) for further follow-up, revision surgery or another primary intervention.
In the absence of complications, the “complications”
subform can be completed with just one answer “no” to the
“complications” question. Where complications have
arisen, the point of time at which they occurred, the type of
complications and the therapeutic and individual consequences are inquired about (Fig. 13.2). All forms can be
found as PDF les under www.eurospine.org—Spine
Tango—forms.
T. Zweig et al.
13.3.6 Content: Patient Based
The proportion of positive outcomes after spinal surgery
depends to a large extent on the manner in which outcome is
assessed [12], and there is no single, universally accepted
method. In the past, clinicians typically judged the outcome
from their own perspective, using simple rating schemes such as
“excellent, good, moderate and poor”. The technical success of
the operation also lent itself to evaluation by means of sophisticated imaging at follow-up. However, most of the time, these
measures proved to be only weakly associated with outcomes of
relevance to the patient and to society [13]. It is now widely
accepted that the focus should be placed on patient-orientated
measures and that the patient should be the main judge of outcome, with the result that clinician-based methods have been
complemented by a diverse range of patient self-assessment
questionnaires. A standardised set of outcome measures for use
with back patients were proposed in 1998 by a multinational
group of experts [13]. There was general consensus that the
most appropriate core outcome measures should include the following domains: pain, back-specic function, generic health
status (well-being), work disability, social disability and patient
satisfaction [13, 14]. Accordingly, the group proposed a parsimonious set of seven preoperative questions that would cover
each of these domains, yet be brief enough to alleviate the
respondent’s burden, and hence be practical for routine clinical
use and quality management. At the time of follow-up, information about occurrence of complications and their bothersomeness from the patient’s perspective, reoperations, satisfaction
with overall medical care in the hospital and extent to which
surgery helped are inquired with four additional questions. The
satisfaction question may, for example, be used to evaluate the
patient’s perception of the “process performance” in a six-sigma
quality improvement initiative [8, 9]. Sufcient clinical research
has meanwhile been conducted with the COMI score outcome
forms for providing details about their application and administration and about clinically and statistically important facts like
the minimum clinically relevant score improvement, standardised response mean values (effect sizes) and dichotomisation of outcomes into “good” and “poor” results [15] (Fig.13.3).
All COMI forms can be found as PDF les under www.
eurospine.org—Spine Tango—forms.
13.3.7 Content: Conservative Form
It took more than a decade from the launch of Spine Tango in
2000 before the need for a documentation form for nonsurgical treatments of the spine led to the development of a
“Spine Tango Conservative” form (Kessler etal. Eur Spine J
2011). Shortly afterwards followed patient-based forms for
the non-surgical treatment of the back and neck (COMI back
conservative/COMI neck conservative). Implementation of
the Spine Tango Conservative 2011 form has been reported
in a UK, secondary care setting [11, 16]. In 2018, an interna-
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