Cathryn D Peltz1, Roger Zauel2, Nicole Ramo2, Nima Mehran3, Vasilios Moutzouros3, Michael J Bey2. 1. Bone and Joint Center, Henry Ford Hospital, Detroit, MI, USA. Electronic address: cpeltz1@hfhs.org. 2. Bone and Joint Center, Henry Ford Hospital, Detroit, MI, USA. 3. Department of Orthopaedic Surgery, Henry Ford Hospital, Detroit, MI, USA.
Abstract
BACKGROUND: Traumatic glenohumeral joint (GHJ) dislocations are common, resulting in significant shoulder disability and pain. Previous research indicates that bony morphology is associated with an increased risk of injury in other joints (eg, the knee), but the extent to which bony morphology is associated with traumatic GHJ dislocation is unknown. This study assessed GHJ morphology in patients with anterior GHJ instability and in a control population of healthy volunteers. METHODS: Bilateral computed tomography scans were used to measure GHJ morphology in both shoulders of 11 patients with instability and 11 control subjects. Specific outcome measures included the glenoid radius of curvature (ROC) in the anterior/posterior (A/P) and superior/inferior (S/I) directions, humeral head ROC, A/P and S/I conformity index, and A/P and S/I stability angle. RESULTS: Compared with the control subjects, the glenoid of the instability the injured shoulder in patients with instability was flatter (ie, higher ROC) in the A/P (P = .001) and S/I (P = .01) directions and this finding was also true for uninjured, contralateral shoulder (A/P: P = .01, S/I: P = .03). No differences in GHJ morphology were detected between the instability patients' injured and contralateral shoulders (P > .07). Similarly, no differences in GHJ morphology were detected between the control subjects' dominant and nondominant shoulders (P > .51). CONCLUSIONS: There are significant differences in GHJ morphology between healthy control subjects and both shoulders (injured and uninjured, contralateral) of patients diagnosed with anterior instability after GHJ dislocation. These findings are important clinically because they suggest that glenoid morphology may influence the risk of GHJ dislocation.
BACKGROUND:Traumatic glenohumeral joint (GHJ) dislocations are common, resulting in significant shoulder disability and pain. Previous research indicates that bony morphology is associated with an increased risk of injury in other joints (eg, the knee), but the extent to which bony morphology is associated with traumatic GHJ dislocation is unknown. This study assessed GHJ morphology in patients with anterior GHJ instability and in a control population of healthy volunteers. METHODS: Bilateral computed tomography scans were used to measure GHJ morphology in both shoulders of 11 patients with instability and 11 control subjects. Specific outcome measures included the glenoid radius of curvature (ROC) in the anterior/posterior (A/P) and superior/inferior (S/I) directions, humeral head ROC, A/P and S/I conformity index, and A/P and S/I stability angle. RESULTS: Compared with the control subjects, the glenoid of the instability the injured shoulder in patients with instability was flatter (ie, higher ROC) in the A/P (P = .001) and S/I (P = .01) directions and this finding was also true for uninjured, contralateral shoulder (A/P: P = .01, S/I: P = .03). No differences in GHJ morphology were detected between the instability patients' injured and contralateral shoulders (P > .07). Similarly, no differences in GHJ morphology were detected between the control subjects' dominant and nondominant shoulders (P > .51). CONCLUSIONS: There are significant differences in GHJ morphology between healthy control subjects and both shoulders (injured and uninjured, contralateral) of patients diagnosed with anterior instability after GHJ dislocation. These findings are important clinically because they suggest that glenoid morphology may influence the risk of GHJ dislocation.
Authors: Matthijs Jacxsens; Shireen Y Elhabian; Sarah E Brady; Peter N Chalmers; Robert Z Tashjian; Heath B Henninger Journal: J Shoulder Elbow Surg Date: 2019-03-28 Impact factor: 3.019
Authors: Cathryn D Peltz; George Divine; Anne Drake; Nicole L Ramo; Roger Zauel; Vasilios Moutzouros; Michael J Bey Journal: J Biomech Date: 2015-07-06 Impact factor: 2.712
Authors: Matthijs Jacxsens; Shireen Y Elhabian; Sarah E Brady; Peter N Chalmers; Andreas M Mueller; Robert Z Tashjian; Heath B Henninger Journal: J Orthop Res Date: 2020-01-24 Impact factor: 3.494
Authors: Ravi Vaswani; Christopher Como; Mitch Fourman; Andrew Wilmot; Camilo Borrero; Dharmesh Vyas; Albert Lin Journal: Arthrosc Sports Med Rehabil Date: 2021-03-09