Peds ortho-anatomy

Orthopedic
Anatomy
Handout download:
http://www.oucom.ohiou.edu/dbms-witmer/peds-rpac.htm

Lawrence M. Witmer, PhD
Department of Biomedical Sciences
College of Osteopathic Medicine
Ohio University
Athens, Ohio 45701
witmer@exchange.oucom.ohiou.edu
20 September 2000

Brachial Plexus
Traumatic injury:
• Terminal branches
• Ventral rami

brachial
plexus
injuries

From Netter 1997

Upper Brachial Plexus Injuries Upper brachial
• Increase in angle between neck & plexus injuries
shoulder
• Traction (stretching or avulsion) of
upper ventral rami (e.g., C5,C6)
• Produces Erb’s Palsy

Lower Brachial Plexus Injuries
• Excessive upward pull of limb
• Traction (stretching or avulsion) of
Lower brachial
lower ventral rami (e.g., C8, T1)
plexus injuries
• Produces Klumpke’s Palsy

“Obstetrical” or “Birth palsy”
• Becoming increasingly rare
• Categorized on basis of damage
• Type I: Upper (C5,6), Erb’s
• Type II: All (C5-T1), both palsies
• Type III: Lower (C8, T1),
Klumpke’s Palsy
From Moore & Dalley (1999)

Upper Brachial Plexus Injury: Erb’s Palsy
• Appearance: drooping, wasted shoulder; pronated
and extended limb hangs limply (“waiter’s tip palsy”)
• Loss of innervation to abductors, flexors,& medial
rotators of shoulder and flexors & supinators of
elbow
• Loss of sensation to lateral aspect of upper
extremity

From Bayne & Costas (1990)

From Netter 1997

Lower Brachial Plexus Injury: Klumpke’s Palsy
• Much rarer than UBPIs and Erb’s Palsy
• Loss of C8 & T1 results in major motor
deficits in the muscles working the hand:
“claw hand”
• Loss of sensation to medial aspect of
upper extremity

“claw
hand”


From Netter 1997

Case Presentation
A 5-year-old boy is brought to the pediatrician with
the complaint that since early childhood the right side
of his neck has been twisted and deformed.
Childbirth apparently had been prolonged and difficult
and was a breech delivery. Within a few weeks, there
was a spindle-shaped swelling on the right side of the
neck that was tender on touch and on passive
movement of the head. Over the next few months, the
swelling and tenderness subsided. By the time the
boy was about 1-year-old, the muscle on the right
side of the neck appeared cordlike. Gradually the
neck became stiff and deformed, as shown at left.
The face was also asymmetrical.


Case modified from Cahill (1997)

Congenital Muscular Torticollis
head
tilts
ipsilat.
chin
raised
contralat.
fibrous
tissue
“tumor”

From Tachdjian (1990)
Sternocleidomastoid (SCM)

• Fibromatosis colli that develops in SCM probably prior to birth, although birth
trauma (e.g., forceps) has also been implicated
• 75% of cases on right side
• SCM is transformed into a cordlike, nonfunctional muscle, distorting head and
neck posture and altering growth of the face
• Etiology is unclear: Arterial or venous obstruction? Intrauterine malposition?

Sternocleidomastoid
• Attachments: proximally,
mastoid proc. & occ. bone;
distally, sternum & clavicle
• Innervation: accessory n., C2,3

• Surgical concerns
• nerves emerging from post.
border (esp. accessory n.)
• jugular veins
• carotid A. & its branches

• Bilateral contraction: flex the neck
• pull chin toward sternum
• in conjunction with neck
extension: protrusion of the chin

• Unilateral contraction: ipsilateral
neck flexion and contralateral
rotation of chin (as in torticollis)


Asymmetries Secondary to Congenital Muscular Torticollis
• Ipsilateral shortening and flattening of face; ipsilateral depression of eye & ear
• Contralateral convex scoliosis in lower cervical and upper thoracic regions;
compensatory ipsilateral convex scoliosis in middle & lower thoracic regions

Photo from Tachdjian (1990)
Photo from Tachdjian (1990)

“Pulled (Nursemaid’s) Elbow”
• Very common in children under 4 (peak: ages 1–3)
• More in common in boys; more common on left side
• Sudden traction with elbow extended & forearm
pronated

presentation

ouch

treatment

From Netter 1987

Subluxation of the
Radial Head
(“pulled elbow”)
• Annular lig. joins radial head to ulna
• Traction on pronated forearm
causes a distal tear in the annular
ligament where it merges with the
periosteum
• Radial head “escapes” anteriorly
• Annular ligament slides onto
articular surface of radial head,
between radial head & capitulum

ann. lig.
• Above the age of slides
proximally entrapment
five, tear does not of ann. lig.
occur because of between
thicker attachement of distal capitulum &
annular ligament to tear radial head
periosteum
From Slaby et al. 1994

Why Subluxation in Pronation?
• Annular ligament restrains radial head, while
allowing axial rotation of the radius
• Steep & sharp lip anteriorly between radial head
& neck—in supination, annular ligament cannot
annular slip proximally over lip
ligament • Shallower lip laterally and posteriorly
• During pronation, rotation of radius brings this
shallow lip anteriorly, allowing proximal slip of
ann. lig. if there is a transverse tear

steep lip shallow lip
anteriorly laterally &
between posterioly
radial head between
and neck radial head
and neck
From Netter 1997

Interposition of the Annular Ligament
• Extent of interposition of the annular ligament
within the joint determines course
• If ligament does not extend beyond “equator”
of radial head (B below), subluxation can be
reduced by closed manipulation (passive
supination)
• If ligament extends beyond equator (A below),
open (surgical) reduction may be required

equator
From Slaby et al. 1994
From Salter & Zalta 1971

“Breaking News”
Self-Actuating Extendible Endoprothesis

• Reported in Nature (July
2000) by Kotz et al.
• Prosthesis designed for
children requiring knee
replacement (due to malignant
bone tumors)
• Previous implants required
repeated surgery to adjust for
growth and to avoid leg-length
discrepancy
• New device does not require
repeated surgery: it extends
automatically with flexion of the
knee

From Kotz et al. 2000

References
Bayne, L. G., and B. L. Costas. 1990. Malformations of the upper limb, pp. 1091–
1128 in R. T. Morrissy (ed.), Lovell and Winter’s Pediatric Orthopaedics,
Volume 2, 3rd Edition. Lippincott, Philadelphia.
Cahill, D. R. 1997. Lachman’s Case Studies in Anatomy, 4th Ed. Oxford
University Press, New York
Kotz, R. I., R. Windhager, M. Dominkus, B. Robioneck, and H. Müller-Daniels.
2000. A self-extending paediatric leg implant. Nature 406:143-144.
Moore, K. L. and A. F. Dalley. 1999. Clinically Oriented Anatomy. Lippincott,
Williams, & Wilkins, Baltimore.
Netter, F. H. 1987. The CIBA Collection of Medical Illustrations, Volume 8:
Musculoskeletal System. CIBA-Geigy, Summit.
———. 1997. Atlas of Human Anatomy, 2nd. Ed. Novartis, East Hanover.
Salter, R. B., and C. Zalta. 1971. Anatomic investigations of the mechanism of
injury and pathologica anatomy of “pulled elbow” in young children. Clinical
Orthopedics 77:141.
Slaby, F. J., S. K. McCune, and R. W. Summers. 1994. Gross Anatomy in the
Practice of Medicine. Lee & Febiger, Baltimore.
Tachdjian, M. O. 1990. Pediatric Orthopedics, Volumes 1–4, 2nd Edition. W. B.
Saunders, Philadelphia.
Thompson, G. H. & P. V. Scoles. 1999. Bone and joint disorders, pp. 2055-2098
in Nelson’s Textbook of Pediatrics. Saunders, Philadelphia.

brief communications

A self-extending paediatric leg implant
This device spares the need for surgical intervention by simulating natural limb growth.

B
iological regeneration of the extremi-
ties can occur in some organisms
(starfish, for example), but humans
need recourse to a mechanical solution.
Growing children present a particular chal-
lenge, and those who lose bone tissue from
the knee after removal of a tumour need an
implant that can not only provide stability
for the femur and allow motion of the knee
joint, but which also accommodates rapid
growth. Here we describe a self-extending
leg implant (endoprosthesis) that can close-
ly simulate natural growth and which has
worked successfully in paediatric patients.
The energy needed for elongation of this
device is provided by the patients them-
selves as a result of flexure of the knee joint,
thereby reducing the number of operations
and the risk of infection associated with
manually extended implants.
The outlook for patients with malignant
bone tumours has historically been poor,
but now increased sophistication in medical
imaging and adjuvant treatment has dra-
matically improved survival. The success of
limb-sparing surgery has also stimulated
technological developments in designing
and manufacturing endoprostheses to
restore function to the damaged limb.
Although bone implants have proved Figure 1 Function of the self-actuating extendible endoprosthesis (known as an intercondylar stepless-extension module). Flexure of the
effective in adults1,2, they cause a significant knee joint induces clockwise rotation of a switch unit (a). An angle of flexion of 100 degrees moves a gear wheel (b) via a carrier by 20
limb-length discrepancy which precludes degrees; this positioning is held by a spring (c). Rotation of the gear wheel is translated to a threaded spindle (d), which in turn causes a
their use in growing children. Extendible movement of 0.056 mm in a telescopic sleeve higher up the leg (e). An 18-fold repetition of this movement causes an elongation of 1 mm.
prostheses have been developed to match
the growth of the opposite limb, but Despite their drawbacks, the application tissue grows, thereby allowing the knee
frequent surgery was necessary for elonga- of these earlier extendible implants proved more flexure and stimulating the elongation
tion procedures, for aseptic loosening of the successful in 13 patients, with definitive mechanism. The number of surgical pro-
growing bone, and to correct failure of the limb salvage and equal limb length after cedures needed for the flexion-controlled
extension mechanism3–7. In a long-term growth was complete. These are compared device has been reduced (Table 1). A fur-
follow-up of uncemented endoprostheses in Table 1 with two patients treated with the ther improvement for children under treat-
implanted after tumour resection of the endoprosthesis, in which continuous auto- ment now is the introduction of a central
lower leg in 13 out of 44 children with matic elongation is brought about by camshaft into the implant (Fig. 1), which
growth arrest, the final clinical and radio- enforced knee bending9. allows the knee to bend painlessly beyond
graphic results matched those of similarly Overlengthening of the self-extendible the point of elongation (100-degree bend)
treated adult patients8. Invasive methods prosthesis is prevented by the tension of the up to an angle of 140 degrees.
involving manual, stepwise elongation of surrounding soft tissues, which increases Rainer I. Kotz*, Reinhard Windhager†,
the implant also cause scar formation that after each elongation procedure (0.056 Martin Dominkus*, Bernd Robioneck‡,
limits motion of the knee joint. mm) and is gradually decreased as the soft Holger Müller-Daniels‡
*Department of Orthopaedics, University of
Table 1 Comparative performance of manually and self-actuating extendible endoprostheses Vienna, Währinger Gürtel 18–20, A-1090 Vienna,
Manual device Self-actuating device Austria
Age at resection of tumour (yr) 11.4 (7.3–16.1) 9.3 (6.5–12.1) e-mail: rainer.kotz@akh-wien.ac.at
Age at implantation of module (yr) 12.8 (10–18) 12.9 (10.3–15.5) †Department of Orthopaedics, University of Graz,
Deficit in leg length at implantation (mm) 12 (0–40) 48 ( 45– 51) Auenbruggerplatz 29, A-8036 Graz, Austria
Total lengthening after implantation (mm) 84.8 (11–195) 157 (145–169) ‡Stryker Howmedica Osteonics,
Step lengthening (mm) 50–100 mm, by surgery 0.138 mm d 1
Professor-Küntscher-Strasse 1-5,
Number of operations* 10 (5–25) 7.5 (6–9) D-24232 Schönkirchen, Germany
Follow-up (months) 112.6 (70.6–158.1) 105.2 (100.7–109.7) 1. Chao, E. Y. S. & Sim, F. H. in Tumor Prostheses for Bone and
Joint Reconstruction: Design and Application (eds Chao, E. Y. S.
Fifteen cases (12 treated for osteosarcoma, 3 for primitive neuroectodermal tumour/Ewing’s tumours) are shown who have suffered growth arrest after
implantation of either a manual (n 13) or a self-actuating (n 2) growing module. Mean values (and ranges) are shown. & Ivins, J. C.). 335–359 (Thieme, New York, 1983).
*Includes surgical procedures for implantation complications. 2. Kotz, R., Ritschl, P. & Trachtenbrodt, J. Orthopedics 9, 1639–1652
(1986).

NATURE | VOL 406 | 13 JULY 2000 | www.nature.com © 2000 Macmillan Magazines Ltd 143

brief communications
3. Scales, J. T., Sneath, R. S. & Wright, K. W. J. in Limb Salvage 591–599 (Springer, Berlin, 1991). Paper chromatography and high-pres-
in Musculoskeletal Oncology (ed. Enneking, W. F.) 52–60 6. Eckardt, J. J. et al. in Limb Salvage: Major Reconstructions in sure liquid chromatography of cyanogens
(Churchill Livingstone, New York, 1987). Oncologic and Nontumoral Conditions (eds Langlais, F. &
4. Lewis, M. M., Spires, W. P. Jr & Bloom, N. in Limb Salvage Tomeno, B.) 585–590 (Springer, Berlin, 1991).
from H. sara and its host plant P. auriculata
in Musculoskeletal Oncology (ed. Enneking, W. F.) 606–610 7. Schiller, C. et al. J. Bone Jt Surg. 77B, 608–614 (1995). were followed by specific enzyme tests, 1H-
(Churchill Livingstone, New York, 1987). 8. Mittermeyer, F. et al. Clin. Orthoped. (submitted). and 13C-NMR analyses, and mass spec-
5, Kotz, R., Schiller, C., Windhager, R. & Ritschl, P. in 9. Windhager, R., Robioneck, B., Bien, M., Müller, H. & troscopy. We compared spectral data from
Limb Salvage: Major Reconstructions in Oncologic and Kotz, R. Medizinisch Orthopadische Technik 115, 152–154
Nontumoral Conditions (eds Langlais, F. & Tomeno, B.) (1995).
these cyanogens and their tetramethyl-
silane–ether derivatives with published
spectra for cyanogens of Passifloraceae and
related families1,4,5. The primary cyanogens
Insect metabolism defence against specialist herbivores such as in P. auriculata were monoglycoside
the larvae of Heliconius butterflies. We cyclopentenyl cyanogen, epivolkenin (90%),
Preventing cyanide investigated how Heliconius butterfly larvae its diastereomer taraktophyllin (5%) and a
release from leaves process cyanogenic glycosides found in
their Passiflora host, a diverse neotropical
diglycoside cyclopentenyl cyanogen (5%).
Of these, only epivolkenin was sequestered

O
rganisms that produce hydrogen genus in which coevolution with Heliconius by H. sara (Fig. 1a).
cyanide gas to protect themselves accounts for morphological innovation in We isolated a previously unknown
against predators can do so by the some species3. metabolic derivative of epivolkenin, sarau-
enzymatic breakdown of a class of com- We examined the fate of five classes of riculatin, from H. sara, which we identified
pounds known as cyanogens (such as Passiflora cyanogens ingested by Heliconius as (1S, 4R)-1-( -D-glucopyranosyloxy)-4-
cyanogenic glycosides)1,2. Here we show larvae by surveying the distribution of hydroxy-2-cyclopentene-1-thiol (Fig. 1b).
how a neotropical butterfly, Heliconius sara, cyanogens found in 12 species of Passi- Sarauriculatin was present at a ratio of 1:2
can avoid the harmful effects of the floraceae and 14 species of teneral adult with epivolkenin. This new compound was
cyanogenic leaves of Passiflora auriculata Heliconius reared on specific hosts. We characterized as a cyclopentenyl cyanogenic
(passion vine), on which its larvae feed extracted cyanogens from fresh Passiflo- glycoside that has undergone replacement
exclusively. To our knowledge this is the raceae and butterflies and identified them of the nitrile group by a thiol, a metabolic
first example of an insect that is able to using published procedures1,4,5. reaction that pre-empts the enzymatic
metabolize cyanogens and thereby prevent All butterflies contained aliphatic release of cyanide.
the release of cyanide. The mechanistic cyanogens, irrespective of their presence in Conversion of nitrile groups is due to
details of this pathway might suggest new host plants, extending previous findings specific enzymatic action8,9, and conversion
ways to make cyanogenic crops more useful that these cyanogens are synthesized de of cyclopentenyl cyanogenic glycoside
as a food source. novo by Heliconius 6. Most cyanogen classes nitriles to their amides occurs spontaneous-
Many organisms, including humans, in hosts were not retained in the butterflies, ly in plant isolates, probably as a result of
possess enzymes for detoxifying hydrogen nor excreted in larval frass. However, we mixing with enzymes during processing10.
cyanide (HCN). Barriers against herbivory found monoglycoside cyclopentenyl cyano- In repeated tests, however, we found sarau-
of cyanogenic plants may be more effective gens in all butterflies fed on Passiflora con- riculatin in butterfly but not in plant iso-
as a result of the slow or inefficient detoxifi- taining these compounds. Acraea horta, a lates. We conclude that a unique enzymatic
cation by the herbivore of HCN or of distant relative of Heliconius, is known to mechanism exists in H. sara for dealing
byproducts of the enzymatic breakdown of sequester a cyclopentenyl cyanogen from with cyanogenic glycosides.
cyanogenic glycoside, which generate not Kiggelaria plants7, but we have now demon- Our results show that cyanogen seques-
only HCN but also toxic aglycones upon strated cyanogen sequestration in Helico- tration in H. sara must be both selective
ingestion1. Nonetheless, cyanogenesis is no nius. and dynamic, because only one type of host
cyanogen is sequestered and this is metabo-
a b lized to release valuable nitrogen into the
HO HO insect’s primary metabolism. A fuller
O O understanding of this process should reveal
HO HO
O
its importance in the nutrition of some
HO OH HO O OH species of Heliconius, provide a new per-
OH OH spective on Heliconius–Passiflora coevolu-
NC H HS H
tion, and suggest how agriculturally
Figure 1 Structures of sequestered cyanogen from H. sara. a, Epivolkenin, and b, the corresponding thiol derivative sarauriculatin important cyanogenic plants might be ren-
(epivolkenin thiol). Spectral data for epivolkenin: (1S, 4R)-1-( -D-glucopyranosyloxy)-4-hydroxy-2-cyclopentene-1-carbonitrile 1H NMR dered safer and more nutritious for human
(250 MHz, CD3OD): aglycone protons at 6.14 (dd, H-2), 6.27 (dd, H-3), 4.81 (m, H-4), 2.25 (dd, H-5A), 3.02 (dd, H-5B), 3J2,3 5.6 Hz, and animal consumption.
4
J2,4 1.3 Hz, 3J3,4 2.0 Hz, 2J5A,5B 14.6 Hz, 3J4,5A 4.8 Hz, 3J4,5B 7.1 Hz, -D-glucopyranosyl protons at 4.62 (d, H-1 ), 3.22 Helene S. Engler*, Kevin C. Spencer†,
(dd, H-2 ), 3.30–3.40 (m, H-3 , H-4 and H-5 ), 3.68 (dd, H-6 A), 3.86 (dd, H-6 B), 3J1 ,2 7.7 Hz, 2J6 A,6 B 12.0Hz, 3J5 ,6 A 5.5 Lawrence E. Gilbert*
Hz, J5 ,6 B 2.0 Hz. C NMR (62.9 MHz, CD3OD): >48.2 (C-5), 62.9 (C-6 ), 75.0 (C-4), 82.3 (C-1), 101.2 (C-1 ), 132.1 and 143.3
2 13
*Section of Integrative Biology, School of Biological
(C-2 and C-3), 120.6 (CN), 71.7, 75.0, 78.2 and 78.4 (remaining sugar resonances). NMR spectral data were identical for epivolkenin Sciences, University of Texas, Austin,
from P. auriculata. Fast atom bombardment mass spectroscopy (MS (FAB)) m/z 287 [M]+, 286 [M-1]+, 269 [M-H20]+, 260 [M-HCN]+. Texas 78712, USA
Optical rotation (D, 589 nm), [ ]25D,+41° (c, 0.0042 g ml 1, in methanol). NMR and optical rotation data were identical for an authentic e-mail: h.engler@mail.utexas.edu
sample of epivolkenin provided by J. W. Jaroszewski. Spectral data for sarauriculatin: (1S, 4R)-1-( -D-glucopyranosyloxy)-4-hydroxy-2- †Mayertorne Manor, Wendover Dean,
cyclopentene-1-thiol. 1H NMR (500 MHz, CD3OD): aglycone protons at 5.96 (dd, H-2), 6.09 (dd, H-3), 4.80 (m, H-4), 1.97 (dd, H-5A), Buckinghamshire HP22 6QA, UK
2.88 (dd, H-5B), 3J2,3 5.6 Hz, 4J2,4 1.3 Hz, 3J3,4 2.0 Hz, 2J5A,5B 13.9 Hz, 3J4,5A 4.6 Hz, 3J4,5B 7.3 Hz, -D-glucopyranosyl pro- 1. Spencer, K. C. in Chemical Mediation of Coevolution (ed.
tons at 4.5 (d, H-1 ), 3.22 (dd, H-2 ), 3.30–3.40 (m, H-3 , H-4 and H-5 ), 3.68 (dd, H-6 A), 3.84 (dd, H-6 B), 3J1 ,2 = 7.7 Hz, 2J6’A,6’B = Spencer, K. C.) 167–240 (Academic, New York, 1988).
2. Jones, D. A. Phytochemistry 47 (suppl. 2), 155–162 (1998).
12.0 Hz, 3J5’,6’A = 5.5 Hz, 2J5’,6’B 2.0 Hz. 13C NMR (500 MHz, CD3OD): 45.4 (C-5), 62.5 (C-6 ), 75.8 (C-4), 93.3 (C-1), 99.4 (C-1 ), 3. Gilbert, L. E. Sci. Am. 247, 110–121 (1982).
134.2 and 141.3 (C-2 and C-3), 71.5, 74.8, 77.8 and 78.0 (remaining sugar resonances). MS (FAB) m/z 294 [M]+, 293 [M-1]+, 276 4. Jaroszewski, J. W., Andersen, J. V. & Billeskov, I. Tetrahedron 43,
[M-H20]+.1H and 13C NMR: proton and carbon nuclear magnetic resonance, respectively; chemical shifts are given in (p.p.m.) and 2349–2354 (1987).
coupling constants J are expressed in Hertz (Hz). 5. Seigler, D. S. & Brinker, A. M. in Methods in Plant Biochemistry

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