Abstract:

The humeral torsion angle is a bony twist of the head of the humerus formed between the proximal and distal articular axis of the humerus, which is essentially significant to measure as it depends on biological activity. The present study was conducted with the aim to document anthropometric variables so as to provide a frame for prosthesis design of humeral components in arthroplasty. A total of 50 dry, normal adult human humeri were obtained from the Department of Anatomy in Nobel Medical College and teaching hospital to measure the angle of torsion, length, and mid-shaft circumference of each bone. The measurement of the angle of humeral torsion was performed by the Kingsley Olmsted method, whereas length and mid-shaft were measured with measuring tape. The data analysis was done in SPSS version 17 to correlate and compare the means. The average (mean± SD) angle of torsion for 50 unpaired dry humeri of both sides was compared and found to be statistically significant (p= 0.004, Right= 66.24± 8.67°, Left= 59.56± 6.7°). Mid-shaft circumference was positively correlated with the angle of torsion and was statistically significant (p=0.012, r= 0.351). The study concludes that mid-shaft circumference was found to be more with a large angle of humeral torsion, but there was no significant correlation with the length of the humeral shaft.

References:

[1] Krahl VE. (1947). The torsion of the humerus; its localization, cause, and duration in man. Am J Anat., 80:275–319.

[2] Evans FG, Krahl VE. (1945). The torsion of the humerus: a phylogenetic study from fish to man. Am J Anat., 76:303–07.

[3] Mehta L, Chaturvedi RP. (1971). The angle of humeral torsion. J Anat Soc India, 20:94–98.

[4] Murachovsky J, Ikemoto RY, Nascimento LGP, et al. (2007). Evaluation of humeral head retroversion in handball players. Acta Ortop Bras, 15:258-61.

[5] Motagi M, Shankar N, Ravindranath R. (2011). Estimation of the angle of humeral torsion from digital images of dry humeri of South Indian origin. International Journal of Experimental and Clinical Anatomy, 6-7:34-41.

[6] Shah RK, Trivdei BD, Patel JP, Shah GV, Nirvan AB. (2006). A Study of Angle of Humeral Torsion. J Anat Soc India, 55(2):43-47.

[7] King J, Brelsford HJ, Tullos HS. (1969). Analysis of the pitching arm of the professional baseball pitcher. Clin Orthop Relat Res, 67:116-23.

[8] Symeonides PP, Hatzokos I, Christoforides J, Pournaras J. (1995). Humeral head torsion in recurrent anterior dislocation of the shoulder. J Bone Joint Surg Br, 77:687-90.

[9] Dare SS, Masilili MG, Okumu G, Mohammed YG, Abba S, Okpanachi AO. (2012). Determination of angles of torsion and retroversion of the humerus of male and female skeleton specimens in Uganda. Asian J Med Sci, 4(5):174–78.

[10] Kingsley PC, Olmsted KL. (1948). A study to determine the angle of anteversion of the neck of the femur. J Bone Joint Surg Am, 30A: 745-51.

[11] Sachin Patil et al. (2016). Determining Angle of Humeral Torsion Using Image Software Technique, Journal of Clinical and Diagnostic Research, 10(10): AC06-AC09.

[12] Takenaga T et al, (2017). Left-handed skeletally mature baseball players have smaller humeral retroversion in the throwing arm than right-handed players; J Shoulder Elbow Surg., 26(12):2187-2192, doi: 10.1016/j.jse.2017.07.014.