H Lenoir1, J P Micallef2, I Djerbi3, T Waitzenegger3, C Lazerges3, M Chammas3, B Coulet3. 1. Hand and Upper Limb Surgical unit, Lapeyronie Teaching Hospital, CHU Lapeyronie, 371, avenue du Doyen-Gaston Giraud, 34295 Montpellier cedex 5, France. Electronic address: hubert.lenoir@laposte.net. 2. Research Laboratory: Movement to Health (M2H), EA 2991, STAPS School of Sports Science, Montpellier-1 University, Montpellier, France. 3. Hand and Upper Limb Surgical unit, Lapeyronie Teaching Hospital, CHU Lapeyronie, 371, avenue du Doyen-Gaston Giraud, 34295 Montpellier cedex 5, France.
Abstract
BACKGROUND: Restoring the axis of rotation is often considered crucial to achieving good functional outcomes of total elbow arthroplasty. The objective of this work was to evaluate whether variations in implant positioning correlated with clinical outcomes. HYPOTHESIS: Clinical outcomes are dictated by the quality of implant positioning. MATERIAL AND METHODS: A retrospective review was conducted of data from 25 patients (26 elbows). Function was assessed using a pain score, the Disabilities of the Arm, Shoulder, and Hand (DASH) Score, and the Mayo Elbow Performance Score (MEPS). The patients also underwent a clinical evaluation for measurements of motion range and flexion/extension strength. Position of the humeral and ulnar implants was assessed by computed tomography with reconstruction using OsiriX software. Indices reflecting anterior offset, lateral offset, valgus, height, and rotation were computed by subtracting the ulnar value of each of these variables from the corresponding humeral value. These indices provided a quantitative assessment of whether position errors for the two components had additive effects or, on the contrary, counterbalanced each other. Elbows with prosthetic loosening or extensive epiphyseal destruction were excluded. RESULTS: Of the 26 elbows, 5 were excluded. In the remaining 21 elbows, the discrepancy between the humeral and ulnar lateral offsets was significantly associated with pain intensity (P ≤ 0.05) and the MEPS (P ≤ 0.05). Anterior position of the ulna relative to the humerus was associated with decreased extension strength (P ≤ 0.05) and worse results for all functional parameters (P ≤ 0.05). DISCUSSION: In the absence of loosening, positioning errors seem to adversely affect functional outcomes, probably by placing inappropriate stress on the soft tissues. LEVEL OF EVIDENCE: III.
BACKGROUND: Restoring the axis of rotation is often considered crucial to achieving good functional outcomes of total elbow arthroplasty. The objective of this work was to evaluate whether variations in implant positioning correlated with clinical outcomes. HYPOTHESIS: Clinical outcomes are dictated by the quality of implant positioning. MATERIAL AND METHODS: A retrospective review was conducted of data from 25 patients (26 elbows). Function was assessed using a pain score, the Disabilities of the Arm, Shoulder, and Hand (DASH) Score, and the Mayo Elbow Performance Score (MEPS). The patients also underwent a clinical evaluation for measurements of motion range and flexion/extension strength. Position of the humeral and ulnar implants was assessed by computed tomography with reconstruction using OsiriX software. Indices reflecting anterior offset, lateral offset, valgus, height, and rotation were computed by subtracting the ulnar value of each of these variables from the corresponding humeral value. These indices provided a quantitative assessment of whether position errors for the two components had additive effects or, on the contrary, counterbalanced each other. Elbows with prosthetic loosening or extensive epiphyseal destruction were excluded. RESULTS: Of the 26 elbows, 5 were excluded. In the remaining 21 elbows, the discrepancy between the humeral and ulnar lateral offsets was significantly associated with pain intensity (P ≤ 0.05) and the MEPS (P ≤ 0.05). Anterior position of the ulna relative to the humerus was associated with decreased extension strength (P ≤ 0.05) and worse results for all functional parameters (P ≤ 0.05). DISCUSSION: In the absence of loosening, positioning errors seem to adversely affect functional outcomes, probably by placing inappropriate stress on the soft tissues. LEVEL OF EVIDENCE: III.
Authors: Andrew King; Jonathan P Evans; Simon J Booker; James Cs Beazley; Robin Js Jones; William Jc Thomas; Christopher Smith Journal: Shoulder Elbow Date: 2018-05-25
Authors: Danielle Meijering; Alexander L Boerboom; Carina L E Gerritsma; Bertram The; Michel P J van den Bekerom; Marco van der Pluijm; Riemer J K Vegter; Sjoerd K Bulstra; Denise Eygendaal; Martin Stevens Journal: BMJ Open Date: 2021-05-05 Impact factor: 2.692