Louis-Nicolas Veilleux1,2, Mohammed AlOtaibi3,4,5, Noémi Dahan-Oliel3,6, Reggie C Hamdy3,6. 1. Shriners Hospital for Children, 1003, Boulevard Décarie, Montréal, Quebec, H4A 0A9, Canada. lnveilleux@shriners.mcgill.ca. 2. Faculty of Medicine, McGill University, 3605 Rue de la Montagne, Montreal, Quebec, H3G 2M1, Canada. lnveilleux@shriners.mcgill.ca. 3. Shriners Hospital for Children, 1003, Boulevard Décarie, Montréal, Quebec, H4A 0A9, Canada. 4. Faculty of Graduate Studies, McGill University, 845 Sherbrooke Street West, Montreal, Quebec, H3A 0G4, Canada. 5. King Fahad Medical City, Al Mukarramah Branch Rd, As Sulimaniyah, Riyadh, Makkah, 11525, Saudi Arabia. 6. Faculty of Medicine, McGill University, 3605 Rue de la Montagne, Montreal, Quebec, H3G 2M1, Canada.
Abstract
PURPOSE: The purpose of the study is to provide a methodology to quantify knee height asymmetry (KHA) and to establish the incidence of knee height asymmetry in a patient population visiting the limb length discrepancy clinic in a paediatric-orthopaedic hospital centre. METHOD: A retrospective chart review was performed on all patients who attended the limb length discrepancy clinic and underwent corrective surgery at the Shriners Hospital for Children-Canada from December 2009 to December 2015. Full-standing anteroposterior radiographs were used to measure pre- and post-surgery limb length discrepancy and knee height asymmetry for 52 individuals included in the study. RESULTS: Sixty-seven percent of the studied population had a KHA of 20 mm or less, 25% had a KHA between 20 and 40 mm, and 8% had a KHA of over 40 mm. The average KHA preoperatively for all 52 individuals was 17 ± 14 mm (range 0-59 mm), which represents roughly 2.5% of total limb length. There was a 3-mm non-significant reduction in KHA size between pre-and post-operative states (p = 0.22). CONCLUSION: The current study provides a method to quantify knee height asymmetry. Using this method, it was shown that knee height asymmetry is frequent in youth with limb length discrepancy in both pre- and post-corrective surgery states. The relatively high incidence of knee height asymmetry highlights the importance to investigate the impact of knee height asymmetry in youth living with a limb length discrepancy.
PURPOSE: The purpose of the study is to provide a methodology to quantify knee height asymmetry (KHA) and to establish the incidence of knee height asymmetry in a patient population visiting the limb length discrepancy clinic in a paediatric-orthopaedic hospital centre. METHOD: A retrospective chart review was performed on all patients who attended the limb length discrepancy clinic and underwent corrective surgery at the Shriners Hospital for Children-Canada from December 2009 to December 2015. Full-standing anteroposterior radiographs were used to measure pre- and post-surgery limb length discrepancy and knee height asymmetry for 52 individuals included in the study. RESULTS: Sixty-seven percent of the studied population had a KHA of 20 mm or less, 25% had a KHA between 20 and 40 mm, and 8% had a KHA of over 40 mm. The average KHA preoperatively for all 52 individuals was 17 ± 14 mm (range 0-59 mm), which represents roughly 2.5% of total limb length. There was a 3-mm non-significant reduction in KHA size between pre-and post-operative states (p = 0.22). CONCLUSION: The current study provides a method to quantify knee height asymmetry. Using this method, it was shown that knee height asymmetry is frequent in youth with limb length discrepancy in both pre- and post-corrective surgery states. The relatively high incidence of knee height asymmetry highlights the importance to investigate the impact of knee height asymmetry in youth living with a limb length discrepancy.
Entities:
Keywords:
Gait; Knee height asymmetry; Leg length discrepancy; Pelvic obliquity
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