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A comparison between a hinged plate and screw system and a conventional tension-band plate and screw system used for correction of an angular deformity of the lower limb: an animal study.

Wu Z, Zhao D, Zhao L, Liu J, Li H, Zhu J, Ma F, Porter DE - J Orthop Surg Res (2015)

Bottom Line: The technique was compared with the use of a conventional tension-band plate and screw system.A P < 0.05 was statistical significant.No significant difference was found between the groups regarding the mean corrective rates of the angles (P < 0.05).

View Article: PubMed Central - PubMed

Affiliation: Department of Pediatric Orthopaedics, Xin-Hua Hospital affiliated to Shanghai Jiao Tong University School of Medicine, No. 1665, Kongjiang Road, Shanghai, 200092, China. w993167wmg@163.com.

ABSTRACT

Background: The purpose of the animal study is to introduce a newly designed hinged plate and screw system for correction of angular deformities of the lower limbs. The technique was compared with the use of a conventional tension-band plate and screw system.

Methods: This is a randomized controlled animal trial. Eight 3-month-old Bama miniature pigs were used to establish animal models. In each animal, one leg was randomly allocated into study group and another leg into control group. Legs of the study group were corrected with a hinged plate and screw system, and legs of the control group were corrected with a conventional tension-band plate and screw system. The corrective rates of medial slope angle, medial proximal tibial angle, and angle of the two arms of the hinged plate were measured. Residual stress on the implants was also evaluated. A P < 0.05 was statistical significant.

Results: At the final measurements of 18 weeks, the mean corrective rates of medial slope angle, medial proximal tibial angle, and angle of the two arms of the study group were 0.71°/week, 0.85°/week, and 2.18°/week, respectively; the data in the control group were 0.84°/week, 0.89°/week, and 2.13°/week, respectively. No significant difference was found between the groups regarding the mean corrective rates of the angles (P < 0.05). The mean residual stress in the study group was 643.35 MPa, and measurement in the control group was 1,273.63 MPa, with a significant difference (P < 0.05).

Conclusions: Compared to the conventional tension-band plate and screw system, the hinged plate and screw system may be more reliable for correction of angular deformities of the lower limb.

No MeSH data available.


Related in: MedlinePlus

Sketch map of hemiepiphysiodesis. (A) The hinged plate almost completely matches the contour of the bone. (B) The straight conventional plate does not match the bone surface.
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Fig2: Sketch map of hemiepiphysiodesis. (A) The hinged plate almost completely matches the contour of the bone. (B) The straight conventional plate does not match the bone surface.

Mentions: The purpose of the study was to introduce a hinged plate and screw system for correction of angular deformities of the lower limb in animal models (Figures 1 and 2). We also compared the use of the implant with the use of the conventional tension-band plate and screw system in the experimental cohort study.Figure 1


A comparison between a hinged plate and screw system and a conventional tension-band plate and screw system used for correction of an angular deformity of the lower limb: an animal study.

Wu Z, Zhao D, Zhao L, Liu J, Li H, Zhu J, Ma F, Porter DE - J Orthop Surg Res (2015)

Sketch map of hemiepiphysiodesis. (A) The hinged plate almost completely matches the contour of the bone. (B) The straight conventional plate does not match the bone surface.
© Copyright Policy - open-access
Related In: Results  -  Collection

License 1 - License 2
Show All Figures
getmorefigures.php?uid=PMC4419467&req=5

Fig2: Sketch map of hemiepiphysiodesis. (A) The hinged plate almost completely matches the contour of the bone. (B) The straight conventional plate does not match the bone surface.
Mentions: The purpose of the study was to introduce a hinged plate and screw system for correction of angular deformities of the lower limb in animal models (Figures 1 and 2). We also compared the use of the implant with the use of the conventional tension-band plate and screw system in the experimental cohort study.Figure 1

Bottom Line: The technique was compared with the use of a conventional tension-band plate and screw system.A P < 0.05 was statistical significant.No significant difference was found between the groups regarding the mean corrective rates of the angles (P < 0.05).

View Article: PubMed Central - PubMed

Affiliation: Department of Pediatric Orthopaedics, Xin-Hua Hospital affiliated to Shanghai Jiao Tong University School of Medicine, No. 1665, Kongjiang Road, Shanghai, 200092, China. w993167wmg@163.com.

ABSTRACT

Background: The purpose of the animal study is to introduce a newly designed hinged plate and screw system for correction of angular deformities of the lower limbs. The technique was compared with the use of a conventional tension-band plate and screw system.

Methods: This is a randomized controlled animal trial. Eight 3-month-old Bama miniature pigs were used to establish animal models. In each animal, one leg was randomly allocated into study group and another leg into control group. Legs of the study group were corrected with a hinged plate and screw system, and legs of the control group were corrected with a conventional tension-band plate and screw system. The corrective rates of medial slope angle, medial proximal tibial angle, and angle of the two arms of the hinged plate were measured. Residual stress on the implants was also evaluated. A P < 0.05 was statistical significant.

Results: At the final measurements of 18 weeks, the mean corrective rates of medial slope angle, medial proximal tibial angle, and angle of the two arms of the study group were 0.71°/week, 0.85°/week, and 2.18°/week, respectively; the data in the control group were 0.84°/week, 0.89°/week, and 2.13°/week, respectively. No significant difference was found between the groups regarding the mean corrective rates of the angles (P < 0.05). The mean residual stress in the study group was 643.35 MPa, and measurement in the control group was 1,273.63 MPa, with a significant difference (P < 0.05).

Conclusions: Compared to the conventional tension-band plate and screw system, the hinged plate and screw system may be more reliable for correction of angular deformities of the lower limb.

No MeSH data available.


Related in: MedlinePlus