当前位置： SCI文献检索 > BMC MUSCULOSKELETAL DISORDERS期刊下所有文献 > Calculation method to predict postoperative limb length in patients undergoing THA following developmental dysplasia of hips.

Calculation method to predict postoperative limb length in patients undergoing THA following developmental dysplasia of hips.

Abstract：

BACKGROUND:Limb length discrepancy (LLD) is one of the main cause of dissatisfaction after total hip arthroplasty (THA). The teardrop-lesser trochanter method can accurately predict and analyze LLD for healthy people. However, for patients with preoperative LLD, no method for predicting postoperative LLD is currently available, and these patients are highly susceptible to more severe LLD after THA. Accordingly, this study proposed a calculation method to predict postoperative limb length for these patients. METHODS:Eighty patients who underwent THA between May 2016 and October 2018 due to unilateral developmental dysplasia of the hip (DDH) were evaluated. Relevant parameters were measured from radiographs of full-length lower limbs, e.g. the distance between the rotation center of the hip and the midpoint of the tibial plafond and the distance between the point which was marked at the same height as the lesser trochanter on the anatomical long axis of the femur and the midpoint of the tibial plafond. Then, a mathematical model was established by simplifying the structure from the hip to the ankle. The relationship between the placement position of the prosthesis and the LLD value was calculated by Law of Sines and Iterative Calculation. RESULTS:The preoperatively predicted LLD values and the postoperatively measured LLD values were compared, yielding a mean absolute difference of 3.7 (range, 0.1 to 8.6) mm. The intraclass correlation coefficient (ICC) of the two parameters exhibited strong reliability (ICC = 0.911, 95%CI, 0.795 to 0.955). The Bland-Altman plot also showed good conformity between the two parameters. CONCLUSIONS:The proposed calculation method effectively predicted the postoperative LLD using preoperative parameters. Despite the complexity of the method, it can go a long way towards reducing the occurrence of severe postoperative LLD in DDH-THA.

journal_name

BMC Musculoskelet Disord

journal_title

BMC musculoskeletal disorders

authors

Guo R,Chen JY,Zhang G,Zhou Y,Chen J,Chai W

doi

10.1186/s12891-019-2903-7

subject

Has Abstract

pub_date

2019-11-03 00:00:00

pages

513

issue

issn

1471-2474

pii

10.1186/s12891-019-2903-7

journal_volume

pub_type

杂志文章

在线工具

Calculation method to predict postoperative limb length in patients undergoing THA following developmental dysplasia of hips.