Balancing Distraction Forces in the Mandible: Newton’s Third Law of Distraction

Shakir, Sameer; Naran, Sanjay; Lowe, Kristen M.; Bartlett, Scott P.

doi:10.1097/gox.0000000000001856

Cited by 6 publications

(4 citation statements)

References 13 publications

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“…These data implied that the affected condyles rotated slightly post-MDO. When distracting the shortened ramus of the mandible in HFM, Shakir et al3 found that the proximal segment distracting force promoted counterclockwise rotation about the condyle and impacted on the TMJ. In another study, Master et al8 found that during the distraction period, a patient could posture the jaw forwards; this could be the result of pain or swelling in the joints.…”

Section: Discussionmentioning

confidence: 99%

“…Since then, mandibular distraction osteogenesis (MDO) had proven to be a powerful tool for the correction of HFM. 3 Mandibular distraction osteogenesis is associated with several irreplaceable advantages over traditional osteotomies and bone grafting for skeletal expansion. For example, the mandible can be lengthened at a young age and the soft tissues can adapt gradually due to the slow lengthening procedure.…”

mentioning

confidence: 99%

“…In 1992, McCarthy2 used distraction osteogenesis, a form of treatment in which new bone is formed between bone segment surfaces that are gradually separated by incremental traction applied to the mandible of patients with HFM. Since then, mandibular distraction osteogenesis (MDO) had proven to be a powerful tool for the correction of HFM 3. Mandibular distraction osteogenesis is associated with several irreplaceable advantages over traditional osteotomies and bone grafting for skeletal expansion.…”

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confidence: 99%

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Morphologic Changes of the Temporomandibular Joint in Pruzansky-Kaban Type IIa Hemifacial Microsomia Postmandibular Distraction Osteogenesis

Shu

Liu

Zhao

et al. 2022

Journal of Craniofacial Surgery

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Objective: Mandibular distraction osteogenesis (MDO) is a powerful tool for the correction of hemifacial microsomia (HFM). The temporomandibular joint (TMJ) is the focus of attention in the diagnosis and treatment of HFM. This observational retrospective cross-sectional study aimed to investigate morphologic changes in TMJ post-MDO in type IIa HFM. Methods: We recruited 48 patients with unilateral type IIa HFM who had completed MDO and mandibular distractor extraction (MDE). Data relating to the length, distance, angle, and volume of the TMJ were measured on 3-dimension models created by the analysis of computed tomography data. Normality analysis was performed by using the Shapiro-Wilk test. Data were compared with the paired t test and Wilcoxon signed-ranks test. Results: The spaces between the affected condyle and the affected glenoid fossa before MDO were all significantly larger than before MDE (P<0.05). The breadth of the affected glenoid fossa before MDO was significantly longer than before MDE (P<0.001). The height of the affected condyle before MDO was significantly longer than before MDE (P<0.001). The volume of the affected condyle before MDO was significantly larger than before MDE (P<0.001). The ratio between the volume of the affected condyle and unaffected condyle before MDO was 0.20±0.13. The ratio between the volume of the affected condyle before MDE and MDO was 0.65±0.32. The resorption rate of the affected condyle post-MDO was 0.35±0.32. Conclusion: Herein, we characterized anatomic changes of the TMJ in type- IIa HFM post-MDO. Condylar resorption and the compression of space between the condyle and the glenoid fossa on the affected side were 2 typical manifestations. Our findings enhanced the understanding of the application of MDO on HFM.

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Section: Discussionmentioning

confidence: 99%

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confidence: 99%

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confidence: 99%

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Morphologic Changes of the Temporomandibular Joint in Pruzansky-Kaban Type IIa Hemifacial Microsomia Postmandibular Distraction Osteogenesis

Shu

Liu

Zhao

et al. 2022

Journal of Craniofacial Surgery

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“…As a concept, rebound therapy is based on the physical principles of bouncing such as kinetic energy, Hooke's law, Newton's third law and potential energy [7,8,9,10,11]. These properties lead to several biomechanical, physiological and therapeutic effects [11].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Rebound Therapy on Gross Motor Functions in a Child with Spastic Cerebral Palsy: A Case Study

Kora

Abdelaziem

2020

BioSci Rev.

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Delayed development of the gross motor function abilities is the main manifestation of cerebral palsy (CP) in all children affected by it. Rebound therapy was introduced to help children with different disabilities such as CP. The aim of this case study was to assess the effect of the rebound therapy on the gross motor function abilities in a child with spastic CP. An eight year old girl with spastic CP of Level I on the gross motor function classification system (GMFSC) and graded 1 on the Modified Ashworth Scale (MAS) was selected to undergo the rebound therapy program using mini trampoline. Gross motor abilities were assessed pre- and post- rebound therapy program. The program was conducted for three successive months - three times / week for half an hour / session. The comparison of pre- and post- treatment results showed that rebound therapy improved the total gross motor function abilities by 3.8%, the sitting function by 5%, the kneeling and crawling functions by 3%, the standing function by 2.7% and the walking, running and jumping functions by 8% in a child with spastic CP. Rebound therapy was effective in improving gross motor function abilities in a child with spastic CP. However, further randomized control trials are recommended.

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