Epub 2017 May 8. Humeral torsion and retroversion in the literature: A reply to Larson 2013 Dec;99(8):887-94. doi: 10.1016/j.otsr.2013.08.008. The humeral torsion angle (HTA) of throwing athletes is known to be greater on the throwing side than on the non-throwing side. West EA, Knowles NK, Athwal GS, Ferreira LM. Differences between results in terms of sex and age groups were evaluated with the Mann-Whitney U test. HTA median value was 19.5 degrees (25th to 75th percentile: 8.3 degrees-30.5 degrees; range: -4 degrees to 41 degrees) in all healthy volunteers. HHS Tönnis D, Heinecke A. Acetabular and femoral anteversion: relationship with osteoarthritis of the hip. Our own studies on this subject started in 1976 (13-16). In an evolutionary context, humeral torsion refers to the orientation (angle) of the humeral head relative to the mediolateral axis of the distal humerus (Larson, 2007; Rhodes, 2007). In 1971 DEBEVOISE et al. In this study, the parameters of the humerus were measured using CT. The glenohumeral internal rotation (IR) angle and external rotation (ER) angle were measured at 90° shoulder abduction, and HTA was assessed using indirect ultrasonographic techniques. First, by using a specially developed frame, the humeral head retroversion angles (HRAs) of 20 dry humeri were measured by an anatomist and an orthopedist. Retroversion of the humeral head in the normal shoulder and its relationship to the normal range of motion. This angle is measured at the intersection of two lines: one that evenly bisects the articular surface of the humeral head proximally, and the second being the transepicondylar line distally . Hence angle of humeral torsion is 74 ° Humeral torsion viewed from above: O- original position of long axis of head lying at right angle to long axis of lower end (not drawn) on rotation of inner surface anteriorly the long axis of head lies at new position (N) torsion having occurred through 74°. Conclusion: A recent case study suggested a rapid change in the humeral retrotorsion angle … Determining Angle of Humeral Torsion Using Image Software Technique. torsion angle across the geographical locations (Figures ,, , and ). J Shoulder Elbow Surg. H�|UM��8�ϯxG#e�4_�%�KVZe�A�C�� �#0ә�1$?q�����(; p�*�z� Moreover, this study indicated that HTA can be successfully measured using MRI. A 3D comparison of humeral head retroversion by sex and measurement technique. However, little information is available regarding detailed changes in HTA and actual shoulder range of motion during the growth period. Results: The profile of the intertubercular sulcus tangent line of the humeral head and the axis of the distal humerus was identified as the most accurate method for assessing the precision of torsion during MIS for humeral … Epub 2017 Jun 6. Influence of glenoid component design and humeral component retroversion on internal and external rotation in reverse shoulder arthroplasty: a cadaver study. Orthop Traumatol Surg Res. Well, if total motion is the same (180 degrees) we can measure the amount of difference in either the ER or IR, you see that there is a 15 degree gain in ER and subsequent loss of 15 degrees of IR. Rev Chir Orthop Reparatrice Appar Mot. 2017 Jun;9(2):223-231. doi: 10.4055/cios.2017.9.2.223. Transverse scans of each humerus through the proximal and distal ends were obtained in 28 control subjects. RESULTS: Average humeral torsion angles of 27±10° (dominant side) and 31±10° (non-dominant side) were demonstrated in this elite swimming cohort. angle between these two lines was measured at least 3 times for each scan. Humeral torsion d Release Point Low torsion High torsion a Figure 4 | Humeral torsion and throwing performance. endstream endobj 33 0 obj<>stream Results. In general, increased humeral torsion was positively associated with increased internal rotation (IR) and decreased external rotation (ER) ROM. The gender of the bones was also determined... 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