PURPOSE: To investigate the influences of time from injury to surgery and meniscal injuries on knee rotational laxity in anterior cruciate ligament (ACL)-deficient knees using the electromagnetic system retrospectively. METHODS: Ninety-four unilateral ACL-injured patients (44 male and 50 female, mean age: 27.3 ± 11.8 years) were included. The pivot-shift test was performed before ACL reconstruction, as was a quantitative evaluation using the electromagnetic system to determine tibial acceleration. Patients were divided into 4 groups according to the chronicity: group 1, within 3 months (22 patients); group 2, between 3 and 6 months (29 patients); group 3, between 6 and 12 months (23 patients); and group 4, more than 12 months (20 patients). The presence of meniscal injuries was examined arthroscopically. RESULTS: The tibial acceleration was significantly greater in group 4. There was a positive correlation between tibial acceleration and the time from injury to surgery (r = 0.47, P = .02). In groups 1, 2 and 3, the tibial acceleration in patients with a lateral meniscal injury was significantly greater than in patients with a medial meniscal injury and without meniscal injury. When patients with lateral meniscal injury were excluded (leaving those with medial meniscus injury or without meniscal injury), group 4 had significantly greater accelerations than other groups. CONCLUSIONS: In ACL-deficient knees, rotational laxity increased with time and the increased rotational laxity was evident more than 1 year after injury whereas it increased with concomitant lateral meniscal injuries within 1 year after injury. LEVEL OF EVIDENCE: Ⅳ, diagnostic study of nonconsecutive patients.
PURPOSE: To investigate the influences of time from injury to surgery and meniscal injuries on knee rotational laxity in anterior cruciate ligament (ACL)-deficient knees using the electromagnetic system retrospectively. METHODS: Ninety-four unilateral ACL-injured patients (44 male and 50 female, mean age: 27.3 ± 11.8 years) were included. The pivot-shift test was performed before ACL reconstruction, as was a quantitative evaluation using the electromagnetic system to determine tibial acceleration. Patients were divided into 4 groups according to the chronicity: group 1, within 3 months (22 patients); group 2, between 3 and 6 months (29 patients); group 3, between 6 and 12 months (23 patients); and group 4, more than 12 months (20 patients). The presence of meniscal injuries was examined arthroscopically. RESULTS: The tibial acceleration was significantly greater in group 4. There was a positive correlation between tibial acceleration and the time from injury to surgery (r = 0.47, P = .02). In groups 1, 2 and 3, the tibial acceleration in patients with a lateral meniscal injury was significantly greater than in patients with a medial meniscal injury and without meniscal injury. When patients with lateral meniscal injury were excluded (leaving those with medial meniscus injury or without meniscal injury), group 4 had significantly greater accelerations than other groups. CONCLUSIONS: In ACL-deficient knees, rotational laxity increased with time and the increased rotational laxity was evident more than 1 year after injury whereas it increased with concomitant lateral meniscal injuries within 1 year after injury. LEVEL OF EVIDENCE: Ⅳ, diagnostic study of nonconsecutive patients.
Authors: Lachlan M Batty; Andrew Firth; Gilbert Moatshe; Dianne M Bryant; Mark Heard; Robert G McCormack; Alex Rezansoff; Devin C Peterson; Davide Bardana; Peter B MacDonald; Peter C M Verdonk; Tim Spalding; Alan M J Getgood; Kevin Willits; Trevor Birmingham; Chris Hewison; Stacey Wanlin; Andrew Firth; Ryan Pinto; Ashley Martindale; Lindsey O'Neill; Morgan Jennings; Michal Daniluk; Dory Boyer; Mauri Zomar; Karyn Moon; Raely Pritchett; Krystan Payne; Brenda Fan; Bindu Mohan; Gregory M Buchko; Laurie A Hiemstra; Sarah Kerslake; Jeremy Tynedal; Greg Stranges; Sheila Mcrae; LeeAnne Gullett; Holly Brown; Alexandra Legary; Alison Longo; Mat Christian; Celeste Ferguson; Nick Mohtadi; Rhamona Barber; Denise Chan; Caitlin Campbell; Alexandra Garven; Karen Pulsifer; Michelle Mayer; Nicole Simunovic; Andrew Duong; David Robinson; David Levy; Matt Skelly; Ajaykumar Shanmugaraj; Fiona Howells; Murray Tough; Pete Thompson; Andrew Metcalfe; Laura Asplin; Alisen Dube; Louise Clarkson; Jaclyn Brown; Alison Bolsover; Carolyn Bradshaw; Larissa Belgrove; Francis Millan; Sylvia Turner; Sarah Verdugo; Janet Lowe; Debra Dunne; Kerri McGowan; Charlie-Marie Suddens; Geert Declercq; Kristien Vuylsteke; Mieke Van Haver Journal: Orthop J Sports Med Date: 2021-04-06