Journal of Clinical Orthopaedics and Trauma 11 (2020) 399e405
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Journal of Clinical Orthopaedics and Trauma
journal homepage: www.elsevier.com/locate/jcot
Review article
Midfoot arthritis- current concepts review
Harish Kurup*, Nijil Vasukutty
Pilgrim Hospital, Boston, PE21 9QS, United Kingdom
a r t i c l e i n f o
a b s t r a c t
Article history:
Received 20 January 2020
Received in revised form
25 February 2020
Accepted 3 March 2020
Available online 8 March 2020
Midfoot arthritis causes chronic foot pain and significant impairment of daily activities. Although post
traumatic arthritis and primary osteoarthritis are the most common pathologies encountered, surgeons
need to rule out inflammatory causes and neuropathic aetiology before starting treatment. Steroid Injections are invaluable in conservative management and have diagnostic value in guiding surgical
treatment. For the definitive surgical option of fusion there are a variety of fixation devices available. A
successful union is linked to a satisfactory outcome which most authors report to be in the range of 90%
following the key principles of careful patient selection, pre-operative planning, adequate joint preparation and a stable fixation.
Crown Copyright © 2020 All rights reserved.
Keywords:
Midfoot
Arthritis
Lisfranc
Fusion
Tarso-metatarsal joint
1. Introduction
Midfoot arthritis is a challenging problem causing chronic foot
pain and significant impairment of daily activity. There is little
written about this subject in literature and is often not well known
by orthopaedic surgeons in general. In this review we describe the
anatomy of midfoot, pathology of midfoot arthritis, examination
and diagnosis, investigations followed by treatment options.
2. Anatomy
Midfoot includes Tarso-metatarsal (TMT) joints and naviculocuneiform joints (NCJ). Talo-navicular joint (TNJ) and calcaneocuboid joint (CCJ) are considered to be part of hindfoot along with
sub-talar joint. Tarso-metatarsal joints are divided into three columns anatomically: the medial column (First Tarsometatarsal
joint), the middle column (second and third TMT joints) and the
lateral column (Fourth and Fifth TMT or Metatarsocuboid joints).
TMT joints are collectively known as Lisfranc joints as well.
The navicular has three facets distally each of which articulates
with the three cuneiforms. Cuboideonavicular joint is a fibrous joint
reinforced by ligaments but in some cases a true synovial joint may
be present.1 In the coronal plane the TMT joints are arranged in the
form of a roman arch (Fig. 1). The cuneiforms are wedge-shaped,
* Corresponding author.
E-mail address:
[email protected] (H. Kurup).
https://doi.org/10.1016/j.jcot.2020.03.002
0976-5662/Crown Copyright © 2020 All rights reserved.
with their narrow portions being plantar, thus allowing for the
arch configuration. Metatarsal bases also have a similar shape. The
second metatarsal base assumes the position of keystone because
of the unique slightly more proximal positioning of second TMT
joint than the first and third TMT joints effectively wedging it between the five neighbouring bones. This geometry gives the midfoot it’s inherent stability. Metatarsal bases are connected together
by strong interosseous ligaments except between the first and
second. Instead, the Lisfranc ligament goes obliquely plantarwards
from the medial cuneiform to the base of the second metatarsal.
This is the strongest ligament of all in the Lisfranc joints. In addition
to strong ligamentous support, the entire configuration also receives soft-tissue support from the peroneus longus tendon, the
attachments to which allow it to function as a strong tie beam for
this transverse metatarsal arch.2
3. Biomechanics
The function of the midfoot is to connect the hindfoot to the
forefoot and hence it is less mobile compared to the other joints.
The midfoot functions as a beam, transforming the flexible foot at
heel strike to a rigid lever arm at toe-off. At toe-off, the foot is supinated, locking the transverse tarsal joint. Locking of the transverse tarsal joint allows the midfoot to transfer the force generated
during gait from the hindfoot to the forefoot for locomotion.3 The
peak weight distribution in the standing barefoot adult is 60.5% at
the heel, 7.8% at the midfoot, 28.1% at the forefoot, and 3.6% at the
toes.4 The medial tarsometatarsal joints provide <7 of sagittal
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Fig. 1. Roman arch structure of cuneiforms- Coronal CT.
Fig. 3. AP Radiograph showing alignment of medial and middle columns.
Fig. 2. Injection of midfoot joints under fluoroscopy with use of radiopaque dye.
plane motion, the more mobile lateral fourth and fifth TMT joints
provide balance and accommodation on uneven ground. These
small constrained TMT joints also provide stability and translate the
forward propulsion motion of the hindfoot and ankle joint to the
forefoot metatarsophalangeal joints from heel rise to toe-off.5
Ouzounian and Shereff6 quantified midfoot motion in freshfrozen amputation specimens. Dorsiflexion/plantar flexion motion
was greatest at the fourth/fifth TMT joints (means, 9.6 and 10.2 ,
respectively), followed by the navicular-middle cuneiform (mean,
5.2 ) and the navicular-medial cuneiform articulation (mean, 5.0 ).
Supination & Pronation movements also followed a similar trend.
The second TMT joint had the least motion in dorsiflexion/plantar
flexion (mean, 0.6 ) and supination/pronation (mean, 1.2 ). The
limited motion at the second TMT joint is again thought to be
limited by the strong Lisfranc ligament and the geometry of the
second metatarsal as the keystone in the transverse arch.
A study7 of contact mechanics of the normal tarsometatarsal
joints in cadaveric feet found that the second/third tarsometatarsal
joints bore the majority of the force in all positions of the foot
compared with the first and fourth/fifth tarsometatarsal joint articulations. The force transferred from the second/third tarsometatarsal joints to the first and fourth/fifth tarsometatarsal joints was
greatest in plantar flexion. This appears to be the mechanism by
which the midfoot limits pressure on the second/third tarsometatarsal joints and allows the midfoot to adapt to varying loads and
repetitive stresses. This would explain why second and third TMT
joints are the most common joints to develop arthritis in midfoot
(even in the absence of any history of previous injury).
4. Pathology
Mid foot arthritis is usually caused by one of the following
aetiologies.
Degenerative
Post traumatic
Inflammatory
Neuropathic
Post hindfoot fusion
Post-traumatic arthritis is common in midfoot following both
fractures and the more subtle ligamentous Lisfranc injuries. Primary degenerative arthritis can appear spontaneously, but most
patients may still describe an injury which has been overlooked.
Inflammatory arthritis typically affects multiple joints and so does
neuropathic Charcot. Ankle or Hindfoot fusion can transfer stresses
to midfoot leading to secondary arthritis in later life.
5. Diagnosis
The diagnosis of a Lisfranc pathology must be made on the basis
of the history, physical examination, and radiographic evaluation of
H. Kurup, N. Vasukutty / Journal of Clinical Orthopaedics and Trauma 11 (2020) 399e405
Fig. 4. Lateral Radiograph showing alignment of lateral column.
Fig. 5. Sagittal T1 weighted MR image showing arthritis of second TMT joint.
the foot. History helps to rule out diabetes and inflammatory
arthritis. Most patients recall history of a past injury which they
themselves may have overlooked.
Pain typically gets worse when using stairs or on uneven grounds.
Symptoms are due to lack of stability, altered mechanics and loading
on the inflamed joint. Eventually midfoot collapse occurs leading to a
rigid flatfoot deformity, forefoot abduction and varus, longitudinal
arch collapse (midfoot break usually becomes more apparent on
weight bearing), and osteophyte formation.8 Patients usually have
shoe-wear difficulty secondary to residual deformity.
6. Clinical assessment
Passive manipulation of the midfoot involves abduction of the
forefoot and a pronation stress test to determine the location of
maximal pain. Tenderness across the midfoot is made worse by this
manoeuvre but it cannot stress the TMT joints individually.9 The
piano key test described by Keiserman et al.10 offer better localization of symptomatic joints than manipulation of the whole
midfoot. The midfoot and hindfoot are manually secured and a
plantar force is applied to the individual metatarsal head (as if one
were striking a piano key). An alternative method is to grasp the
401
Fig. 6. Axial T2 weighted MR image showing arthritis of second TMT joint.
desired toe to apply the downward force to the corresponding
metatarsal. The metatarsal acts as a lever arm transmitting the
force and a positive test will produce localized pain at the corresponding TMT joint.
The gap sign11 shows an obvious gap between the first and
second toes of the affected foot, which occurred during weightbearing. It occurs as a result of widening of the intercuneiform joint
with disruption of the Lisfranc ligament but without injury to the
TMT joints.
Injection of a local anaesthetic is an option to determine which
joints are painful or symptomatic. However, some authors8 do not
consider this to be sufficiently accurate, as these joints are small for
selective anaesthesia and local anaesthetic can leak from one to
another. If performed use of radiopaque dye is advisable to confirm
and document exact location of the needle and injection (Fig. 2).
7. Radiology
Weight bearing Antero-posterior, lateral and oblique views are
the first investigation of choice in midfoot arthritis. The addition of
non-weight-bearing lateral radiographs can help identify the level
of midfoot break, which may be at TMT, NCJ, TNJ or a combination
of these. Radiologically medial border of first metatarsal is aligned
with the medical border of the medial cuneiform. The middle column is aligned when the medial border of the second metatarsal is
aligned with the medial border of intermediate cuneiform. On the
lateral side the medial border of the fourth metatarsal is aligned
with the medial border of the cuboid. On lateral radiographs
restoration of arch height and first metatarsal declinational angle
are imperative (Figs. 3 and 4).
MRI (Magnetic Resonance Imaging) is useful in mapping the
degree & extend of arthritis in midfoot. It is very useful to look for
early signs of arthritis in adjacent joints before considering surgical
interventions such as fusion. (Figs. 5 and 6). Technetium bone scan
may be helpful but increased uptake is often noted in joints that are
not painful particularly with respect to the lateral column. Spect-CT
may be useful to find out which one of the arthritic joints is the
worst but again has limited value.
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8. Injection studies
Selective Injection into the affected joints under radiological
guidance is the most commonly used diagnostic test. This also
helps in isolating symptoms and most surgeons prefer to do an
injection before offering a fusion to predict success rate. Injection is
preferably done with radiopaque dye to confirm position of the
needle within the targeted joint; however it is common to see it
leaking out to the adjacent joints as they are interconnected (Fig. 2).
Some surgeons inject in clinic with blind palpation which may
not always be accurate, but this can be improved with the use of
ultrasound guidance.12 Drakonaki et al.13 reviewed a series 59 patients with midfoot joint degenerative changes who received USguided injection. The majority of patients had a positive response
up to 3 months post-injection (78.4% still experiencing pain relief at
2 weeks, 57.5% at 3 months and fewer than 15% of patients further
than 3 months post-injection).
9. Management
additional diagnostic benefit in localising the source of symptoms
and targeting any operative intervention effectively. Evidence on
the effectiveness of local injection is sparse in literature with no
level 1 studies. Grice and colleagues21 retrospectively reviewed 365
patients who had image guided foot injections. 86% reported a
significant improvement in symptoms and 66% a complete resolution of pain. The mode time of recurrence of pain was 3 months
and 29% were asymptomatic at the 2 year follow up. They had 24%
of patients who had operative intervention within the follow up
period. Although they have not restricted this large series to midfoot pathology it will serve as a guide to practice and help in patient
education and in obtaining an informed consent.
Obesity has been linked to all joint degenerative pathology and
the foot is no different.
Investigators from Swansea22 have noted a significant difference
in response to corticosteroid injections for midfoot OA between
obese and nonobese patients with their BMI cut-off being 30. They
found a statistically significant improvement in post injection Selfreported Foot and Ankle Scores (SEFAS) at 4 and 12 months in a
cohort of 37 patients who had 67 injections.
9.1. Non operative management
9.4. Operative management
Initial management of midfoot degenerative arthritis should
always be non-operative. These include use of analgesics, functional orthoses and local injections.
Mild to moderate symptoms do get better with simple analgesics including non-steroidal anti-inflammatory tablets. A network
meta-analysis of 74 randomised trials of 7 NSAIDs (Non-steroidal
anti-inflammatory Drugs)and paracetamol in people with knee or
hip arthritis has come to the conclusion that NSAIDs were more
effective than placebo. Diclofenac at maximum daily dose of
150 mg/day was more effective than ibuprofen, naproxen and celecoxib.14 It is reasonable to extrapolate the results of this to the
management of degenerative arthritis of the foot. Paracetamol was
not found to be effective at any dose. Moreover, concern has been
raised regarding the adverse cardiovascular effects of selective
COX-2 inhibitors.15 In patients who cannot tolerate oral medication,
topical analgesics is an alternative. However, there is no evidence
on literature for the effectiveness of these in foot arthritis. There are
studies showing some efficacy of topical application of Diclofenac,
ketoprofen and capsaicin in knee and hand arthritis.16,17
9.2. Orthoses
Footwear modification and functional orthoses play a key role in
most foot pathology and midfoot arthritis is no exception. For foot
arthritis two types of orthosis are mainly used: 1) shoe stiffening
inserts made from flat thin semi rigid material extending the full
length of the shoe and 2) contoured orthoses which contour the
arch of the foot and extend just proximal to the metatarsal heads.18
Individuals with midfoot arthritis have pronated feet and generate
higher loads under the midfoot. Therefore, the orthoses are
designed to reduce hindfoot eversion and support the medial longitudinal arch. A recent randomised control trial showed improved
pain control and function in midfoot arthritis with a semi rigid
contoured orthosis compared to a sham insert over a 12-week
period.19 Although both full length and three-quarter length inserts are popular among surgeons and orthotists, it has been shown
that full length inserts reduce magnitude and duration of loading
under the medial midfoot and thus better symptom control.20
The decision to operate is usually guided by the level of symptoms
and functional restrictions. Where there are prominent osteophytes
or bony prominences, excision of these is one conservative procedure
that would help with pain and make shoe wear more comfortable
however high failure rates have been reported some surgeons anecdotally. A more definitive treatment option would be arthrodesis of
the arthritic joints or columns. The pain should be localized to the
degenerate joint as seen on X-rays. Diagnostic steroid injections are
invaluable in confirming this before going ahead with fusion.23,24 This
is especially true in multi-joint disease.
Midfoot arthrodesis can be challenging especially if multiple
joints are involved and choosing suitable hardware is important. A
variety of fixation methods have been used ranging from Kirschner
wires, screws, staples and a selection of plates (Figs. 7e10). Filippi,
Myerson and team25 have used a novel hybrid plating system which
incorporated locking and non-locking screws and obtained bony
union in 67 out of 72 patients. They conclude that hybrid plating
system is a reliable alternative for fusion in multi joint disease. A
study from 1996 looked at lag screws for arthrodesis in a series of 32
patients8 and reported improvement of AOFAS (American Orthopaedic Foot and Ankle Society) scores from 44 to 78. Nemec and coworkers26 report on a large series of 104 feet in 95 patients in whom
9.3. Injections
Intra articular corticosteroids have been used joint degenerative
pathology for their therapeutic effect. In the foot they have an
Fig. 7. 65 year old with symptomatic arthritis of 2nd to 5th TMT joints e AP view
(Previous 1st TMT Fusion).
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403
Fig. 8. 65 year old with symptomatic arthritis of 2nd to 5th TMT joints e Lateral view.
Fig. 10. Post-operative Radiographs at 6 months Post Fusion 2nd to 5th TMT joints e
Lateral view.
Fig. 9. Post-operative Radiographs at 6 months Post Fusion 2nd to 5th TMT joints e AP
view.
they achieved a 92% union rate following midfoot arthrodesis of
primary osteoarthritis. They combined this with deformity correction and soft tissue balancing where applicable. Complications
included 8 non unions,3 deep infections and one case of chronic
regional pain syndrome. There were 11 re-operations and 26
symptomatic hardware removals. AOFAS scores improved from 32
pre-operative to 79 post operatively. Staples are an effective alternative when the surgeon is concerned about soft tissue quality and
in situations where scarring from previous procedures preclude
extensive dissection. There have been several reports27,28 of the use
of staples although none of these looks exclusive at their use in
midfoot joints. Fixation devices which use principles of both staples
and plate screw construct are also popular, but no clinical studies
have looked at their use exclusively in midfoot (Figs. 11 and 12).
Pre-operative planning should consider whether an in-situ
arthrodesis or a corrective fusion is in the patient’s best interest.
Fig. 11. Post traumatic arthritis of 2nd TMT joint- Fusion with a Polyaxial Dynamic
plating system with locking screws and compression by spreader e AP & Oblique
views.
Evidence is conflicting in this regard and there have been reports of
this in the setting of post traumatic arthritis. Johnson and Johnson29
report on a series of 15 patients who had an in-situ dowel graft
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Fig. 14. Medial column fusion (Navicular to 1st metatarsal) with locking plate- Lateral
view.
Fig. 12. Post traumatic arthritis of 2nd TMT joint- Fusion with a Polyaxial Dynamic
plating system with locking screws and compression by spreader e Lateral view.
arthrodesis. At a mean follow up of 37 months 11 out of 13 patients
available for follow up, had subjective satisfactory pain relief. Good
to excellent relief was reported in 9 out of the 13 and union was
achieved in 10. On the other hand, Sangeorzan and colleagues30
report results of fusion for failed initial treatment of Lisfranc injuries and state that reduction is key to a good result. They had 69%
good to excellent results. These researchers tried to determine if
fusion of lateral rays was required and have reported that this is not
a factor in determining outcome. We feel that in situ arthrodesis is
acceptable for patients with normal radiographic alignment. In
patients with adult flat foot or cavovarus foot, a deformity correction is required with or without osteotomies. These would make
shoe fitting easier and reduce the risk of the transferring load to
adjacent joints.
Medial column fusions are used to correct severe midfoot break
or arch collapse that accompany diffuse midfoot arthritis. These are
usually done with anatomically contoured plates with the option of
locking and locking screws and typically span the whole medial
column from talus or navicular to first metatarsal depending on the
joints involved Figs. 13 and 14.
Regardless of aetiology the treatment of the symptomatic lateral
TMT joint arthritis is challenging. These joints are mobile and
fusion could lead to non-union, chronic pain and stress fractures.
There have been several reports31,32 of motion sparing procedures
like soft tissue interposition and ceramic interposition arthroplasty.
These report varying outcomes and currently long-term studies are
lacking. This is one area where authors would recommend persisting with non-operative treatment as long as the symptoms are
bearable.
Complications following midfoot surgery include wound healing problems, infection (3%), peripheral nerve injury (9%), nonunion (3e8%), painful neuroma formation (7%) and screw irritation or breakage (9%).33 Arthritis in adjacent joints (4.5%) is a longterm problem that patients should be made aware of. Stress fractures and CRPS have been reported although less common.20,26
Midfoot arthritis can be debilitating, and a successful union is
linked to a satisfactory outcome which most authors report to be on
the range of 90%. The hardware appropriate for each case should be
carefully chosen but the surgeon should not deviate from the key
principles of careful patient selection, pre-operative planning,
adequate joint preparation and a stable fixation.
Funding
This research did not receive any specific grant from funding
agencies in the public, commercial, or not-for-profit sectors.
Declaration of competing interest
The authors declare that they have no known competing
financial interests or personal relationships that could have
appeared to influence the work reported in this paper.
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Fig. 13. Medial column fusion (Navicular to 1st metatarsal) with locking plate- AP
view.
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