AI Article Synopsis
- The study aimed to assess pelvic stability following a specific type (type I) of iliac tumor resection using cadaveric specimens.* -
- Analysis involved applying axial loading to the pelvic models and measuring displacements of the first sacral vertebra (S1) in both resected and intact pelves, revealing significant instability in the resected specimens.* -
- The findings highlighted a need for essential pelvic reconstruction due to severe bone instability post-tumor resection, indicated by a marked increase in S1 vertical displacement and rotation compared to intact pelves.*
Article Abstract
Objective: To analyze the pelvic stability after type I resection of iliac tumor.
Methods: Six adult cadaveric specimens were tested. The iliac subtotal resection models were established according to Ennecking's type I resection. Markers were affixed to the key region of the pelves. Axial loading from the proximal lumbar was applied by MTS load cell in the gradient of 0-500 N in the double feet standing state. Images in front view were obtained using CCD camera. Based on Image J software, displacements of the first sacral vertebrae (S1) of the resected pelves and the intact pelves were calculated using digital marker tracing method with center-of-mass algorithm.
Results: Serious instabilities were found in the resected pelves. S1 rotational movements around the normal side femoral head of the resected pelvis were found. The average vertical displacement of S1 of the resected pelvis was (7 +/- 3) mm under vertical load of 500 newtons, which were 8.3 times compared to the intact pelvis. The average angle of S1 rotation around the normal side femoral head of the resected pelvis was (4.0 +/- 1.8) degrees, which were 12.5 times compared to the intact pelvis.
Conclusions: Biomechanical model of type I resection of iliac tumor are established. Essential pelvic reconstruction must be introduced because of the serious instability of the bone defection after tumor resection.
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