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Published in: European Journal of Orthopaedic Surgery & Traumatology 3/2019

01-04-2019 | Original Article • HIP - ARTHROPLASTY

Effect of changing femoral head diameter on bony and prosthetic jumping angles

Authors: Takaaki Ohmori, Tamon Kabata, Yoshitomo Kajino, Daisuke Inoue, Tadashi Taga, Takashi Yamamoto, Tomoharu Takagi, Junya Yoshitani, Takuro Ueno, Ken Ueoka, Hiroyuki Tsuchiya

Published in: European Journal of Orthopaedic Surgery & Traumatology | Issue 3/2019

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Abstract

Background

In THA, using a larger femoral head can increase the oscillation angle and jumping distance. However, there have been no reports which indicate precisely how increasing the jumping distance leads to an increase in the angle from impingement to dislocation (jumping angle). In this study, we clarified the jumping angle of various head diameters and its relationship with pelvic morphology.

Methods

Using a three-dimensional templating system, virtual THA and ROM simulations were performed in 82 patients. We investigated the distance between bony and prosthetic impingement points and the head centre and calculated the jumping angle for various head diameters. We measured various pelvic shapes and length to clarify the relationship between pelvic morphology and impingement distance.

Results

Jumping angles were 7.7° ± 3.2°, 12.1° ± 1.6°, 15.4° ± 2.5° and 10.0° ± 3.0° with flexion, internal rotation with 90° flexion (IR), extension and external rotation (ER), respectively, when we used a 22-mm head diameter. Bony jumping angle increased about 0.5°, 0.8°, 1.0° and 0.7° per 2-mm increase in head diameter with flexion, IR, extension and ER. On the other hand, prosthetic jumping angle remained almost stable at about 31°. Impingement distance was related to pelvic morphology in all directions. Bony jumping angles differed with ROM; the biggest was seen with extension, followed by IR, ER and flexion. On the other hand, bony jumping angle was less than prosthetic jumping angle in all cases.

Conclusion

Bony jumping angles differed with ROM; the biggest was seen with extension, followed by IR, ER and flexion. Prosthetic impingement angles were stable. In addition, the bony jumping angle was less than the prosthetic jumping angle in all cases.
Literature
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go back to reference Alberton GM, High WA, Morrey BF (2002) Dislocation after revision total hip arthroplasty: an analysis of risk factors and treatment options. J Bone Joint Surg Am 84-A:1788–1792CrossRef Alberton GM, High WA, Morrey BF (2002) Dislocation after revision total hip arthroplasty: an analysis of risk factors and treatment options. J Bone Joint Surg Am 84-A:1788–1792CrossRef
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go back to reference Phillips CB, Barrett JA, Losina E et al (2003) Incidence rates of dislocation, pulmonary embolism, and deep infection during the first six months after elective total hip replacement. J Bone Joint Surg Am 85-A:20–26CrossRef Phillips CB, Barrett JA, Losina E et al (2003) Incidence rates of dislocation, pulmonary embolism, and deep infection during the first six months after elective total hip replacement. J Bone Joint Surg Am 85-A:20–26CrossRef
Metadata
Title
Effect of changing femoral head diameter on bony and prosthetic jumping angles
Authors
Takaaki Ohmori
Tamon Kabata
Yoshitomo Kajino
Daisuke Inoue
Tadashi Taga
Takashi Yamamoto
Tomoharu Takagi
Junya Yoshitani
Takuro Ueno
Ken Ueoka
Hiroyuki Tsuchiya
Publication date
01-04-2019
Publisher
Springer Paris
Published in
European Journal of Orthopaedic Surgery & Traumatology / Issue 3/2019
Print ISSN: 1633-8065
Electronic ISSN: 1432-1068
DOI
https://doi.org/10.1007/s00590-018-2325-5

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