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Biomechanical in vitro - stability testing on human specimens of a locking plate system against conventional screw fixation of a proximal first metatarsal lateral displacement osteotomy.

Arnold H, Stukenborg-Colsman C, Hurschler C, Seehaus F, Bobrowitsch E, Waizy H - Open Orthop J (2012)

Bottom Line: The level of significance was p = 0.05.We found larger stability about all three axes of movement analyzed for the PLATE than the crossed screws osteosynthesis (CSO).The Friedman test showed statistical significance at a level of p = 0.05 for all groups and both translational and rotational movements.

View Article: PubMed Central - PubMed

Affiliation: Orthopädisch - Unfallchirurgische Praxisklinik, Orthopädisches Zentrum Fichtelgebirge, Bahnhofstraße 10, 95111 Rehau, Germany.

ABSTRACT

Introduction: The aim of this study was to examine resistance to angulation and displacement of the internal fixation of a proximal first metatarsal lateral displacement osteotomy, using a locking plate system compared with a conventional crossed screw fixation.

Materials and methodology: Seven anatomical human specimens were tested. Each specimen was tested with a locking screw plate as well as a crossed cancellous srew fixation. The statistical analysis was performed by the Friedman test. The level of significance was p = 0.05.

Results: We found larger stability about all three axes of movement analyzed for the PLATE than the crossed screws osteosynthesis (CSO). The Friedman test showed statistical significance at a level of p = 0.05 for all groups and both translational and rotational movements.

Conclusion: The results of our study confirm that the fixation of the lateral proximal first metatarsal displacement osteotomy with a locking plate fixation is a technically simple procedure of superior stability.

No MeSH data available.


Related in: MedlinePlus

Arrangement of markers in the specimen and name ofmeasurement axes. To record the relative movements on each sideof the osteotomy four markers (diameter 2 mm) were fixed, so thatthe change of the position of the proximal respective to the distalmarkers could be recorded alongside the x-, y- and z - axis. Here,the x - axis runs from proximal to distal parallel to the firstmetatarsal, the y - axis parallel to the osteotomy and perpendicularto the first metatarsal axis and the z - axis perpendicular to the planedefinded by the markers 1- 4.
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F2a: Arrangement of markers in the specimen and name ofmeasurement axes. To record the relative movements on each sideof the osteotomy four markers (diameter 2 mm) were fixed, so thatthe change of the position of the proximal respective to the distalmarkers could be recorded alongside the x-, y- and z - axis. Here,the x - axis runs from proximal to distal parallel to the firstmetatarsal, the y - axis parallel to the osteotomy and perpendicularto the first metatarsal axis and the z - axis perpendicular to the planedefinded by the markers 1- 4.

Mentions: Surgery was done according to the method described by Thomas [9] (Fig. 2a, b). Approximately 1.5 cm distal to the first tarsometatarsal joint line, a saw cut perpendicular to the axis of the first metatarsal was set completely through the bone and subsequently the distal fragment moved 2 mm in a lateral direction, so that this enabled a correction of the increased first intermetatarsal angle. The first tarsometarsal joint itself was left intact correcting only the varus deviation of the first metatarsal by lateral displacement. Due to the rectangular arrangement of screws when fixing the osteotomy with the locking plate the bone surface of the osteotomy was left intact. Moreover the bone structure was not compromised in respect to the oblique passage of the crossed cacellous screws.


Biomechanical in vitro - stability testing on human specimens of a locking plate system against conventional screw fixation of a proximal first metatarsal lateral displacement osteotomy.

Arnold H, Stukenborg-Colsman C, Hurschler C, Seehaus F, Bobrowitsch E, Waizy H - Open Orthop J (2012)

Arrangement of markers in the specimen and name ofmeasurement axes. To record the relative movements on each sideof the osteotomy four markers (diameter 2 mm) were fixed, so thatthe change of the position of the proximal respective to the distalmarkers could be recorded alongside the x-, y- and z - axis. Here,the x - axis runs from proximal to distal parallel to the firstmetatarsal, the y - axis parallel to the osteotomy and perpendicularto the first metatarsal axis and the z - axis perpendicular to the planedefinded by the markers 1- 4.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3367465&req=5

F2a: Arrangement of markers in the specimen and name ofmeasurement axes. To record the relative movements on each sideof the osteotomy four markers (diameter 2 mm) were fixed, so thatthe change of the position of the proximal respective to the distalmarkers could be recorded alongside the x-, y- and z - axis. Here,the x - axis runs from proximal to distal parallel to the firstmetatarsal, the y - axis parallel to the osteotomy and perpendicularto the first metatarsal axis and the z - axis perpendicular to the planedefinded by the markers 1- 4.
Mentions: Surgery was done according to the method described by Thomas [9] (Fig. 2a, b). Approximately 1.5 cm distal to the first tarsometatarsal joint line, a saw cut perpendicular to the axis of the first metatarsal was set completely through the bone and subsequently the distal fragment moved 2 mm in a lateral direction, so that this enabled a correction of the increased first intermetatarsal angle. The first tarsometarsal joint itself was left intact correcting only the varus deviation of the first metatarsal by lateral displacement. Due to the rectangular arrangement of screws when fixing the osteotomy with the locking plate the bone surface of the osteotomy was left intact. Moreover the bone structure was not compromised in respect to the oblique passage of the crossed cacellous screws.

Bottom Line: The level of significance was p = 0.05.We found larger stability about all three axes of movement analyzed for the PLATE than the crossed screws osteosynthesis (CSO).The Friedman test showed statistical significance at a level of p = 0.05 for all groups and both translational and rotational movements.

View Article: PubMed Central - PubMed

Affiliation: Orthopädisch - Unfallchirurgische Praxisklinik, Orthopädisches Zentrum Fichtelgebirge, Bahnhofstraße 10, 95111 Rehau, Germany.

ABSTRACT

Introduction: The aim of this study was to examine resistance to angulation and displacement of the internal fixation of a proximal first metatarsal lateral displacement osteotomy, using a locking plate system compared with a conventional crossed screw fixation.

Materials and methodology: Seven anatomical human specimens were tested. Each specimen was tested with a locking screw plate as well as a crossed cancellous srew fixation. The statistical analysis was performed by the Friedman test. The level of significance was p = 0.05.

Results: We found larger stability about all three axes of movement analyzed for the PLATE than the crossed screws osteosynthesis (CSO). The Friedman test showed statistical significance at a level of p = 0.05 for all groups and both translational and rotational movements.

Conclusion: The results of our study confirm that the fixation of the lateral proximal first metatarsal displacement osteotomy with a locking plate fixation is a technically simple procedure of superior stability.

No MeSH data available.


Related in: MedlinePlus