UNDERWATER ROCK OF THE LIGAMENTUM TERES RECONSTRUCTIONS
Sergey V. Arkhipov
Dedicated to reconstructors
of ligamentum teres...
INTRODUCTION:
Our
colleagues made a wonderful presentation: LT_PHILIPdoNOTlostIT_dicatate.mov,
Philip Rosinsky et al., - Thanks!
PURPOSE:
Here I
would like to recall one of the underwater rock on the way of the ligamentum teres reconstructions.
PREMISS:
Distribution of forces in the hip joint in the
monopodial standing position and in the single limb stance phase of normal gait
is complicated and not obvious.
.jpg) |
| Fig.1 Distribution of forces in the single limb stance phase of normal gait (Arkhipov S.V., 2019) |
PROBLEM:
What is the load on the ligamentum teres?
CONDITIONS
OF THE PROBLEM:
Acceleration
of gravity, g = 9.8
m / s2
Overall of the body mass = 58.7 kg, see experiment of
O.Fischer (Pauwels F, 2012, P.86)
Body mass (single limb support period)
according to Fischer O. = 47.76 kg (Pauwels F., 2012, P.86)
The
maximum dynamic component is the 17th phase of the step (dynamic force)
+24.35 kg (Pauwels F.,
2012, P.87)
Lever arm of the body weight = 0.1099 m (Pauwels F., 2012, P.83)
Lever arm of the abductor muscles = 0.04 m (Pauwels
F.,
2012, P.85)
Kapandji A.I.(2009): m. gluteus medius can develop force - 16 kg, m. gluteus minimus - 4.9 kg, m.
tensor
fascia lata - 7.6 kg; i.e. in total the abductor muscle group can develop
generate =
28.5 kg.
Diameter
of the femoral head = 0.05
m (circa)
Fossa acetabulum
depth 0.01 m (circa)
Bottom
thickness of the fossa acetabulum
=
0.003 m (circa)
SOLUTION OF THE PROBLEM:
Rule of moments for a single support step period Arkhipov S.V. (2019):
PL = FabLab + FltLlt
Body weight ((body mass + dynamic force) × g) in the 17th phase of the step:
P = (47.76 + 24.35) × 9.8 = 706.68 N
Lever arm of the ligamentum teres (half diameter of the femoral head + fossa acetabulum depth + Bottom thickness of the fossa acetabulum):
Llt = 0.05/2 + 0.01 + 0.003 = 0.038 m
Abductor force (pull of the abductor muscle × g):
Fab = 28.5 × 9.8 = 279.3 N
The ligamentum teres load:
Flt = (PL - FabLab) / Llt
Flt = (77.66 - 11.17) / 0.038 = 1749.74 N
UNDERWATER
ROCK:
The loading of the ligamentum teres during walking may be equivalent 178.54 kg, that is 3 times more of the overall body mass.
QUESTION:
.jpg) |
Fig. 2 Presentation of the Rosinsky P. et al., 2019 (video: right – 01 m. 13 s. ; left – 01 m. 18 s.) |
Can
this thread, button and bottom of the acetabulum withstand a load of 178.54 kg
and how long?
ACKNOWLEDGMENTS
My good wishes for success to colleagues: Philip Rosinsky, Jacob Shapira, Ajay C. Lall, and Benjamin G. Domb.
References
1. Rosinsky P., Shapira J., Lall A.C., Domb B.G. (2019) LT_PHILIPdoNOTlostIT_dicatate.mov. Retrieved December 23, 2019. from researchgate.net
2. Arkhipov S.V. (2019, September 22) New Biomechanics of the Hip Joints: Ligamentum Teres as a Functional Relation. Part I. Pictorial Essay. Ligamentum Teres – Ligamentum Incognitum. Vol. 0, № 0, pp. 1–25. Retrieved December 23, 2019. from ligteres.com
3. Pauwels F. Biomechanics of the locomotor apparatus:
contributions on the functional anatomy of the locomotor apparatus. Berline
[etc.], Springer Science & Business Media, 2012.
4.
Kapandji
A.I.
The physiology of the joints: Lower limb. Vol. 2, 5th
ed. New Delhi: Elsevier Exclusive, 2009.
.
The article was first published in 2019 (December 23) on the website www.ligteres.com, copy:
Arkhipov SV. Underwater Rock of the Ligamentum Teres Reconstructions. Ligamentum Teres – Ligamentum Incognitum. 2019, December 23:1-3. doi.org/10.13140/RG.2.2.22632.42249 [researchgate.net]
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