Humeral torque in professional baseball pitchers

被引:110
作者
Sabick, MB
Torry, MR
Kim, YK
Hawkins, RJ
机构
[1] Steadman Hawkins Sports Med Fdn, Vail, CO 81657 USA
[2] Gachon Med Sch, Gil Med Ctr, Inchon, South Korea
[3] Steadman Hawkins Clin, Vail, CA USA
关键词
pitching mechanics; humerus; fracture; shoulder;
D O I
10.1177/0363546503259354
中图分类号
R826.8 [整形外科学]; R782.2 [口腔颌面部整形外科学]; R726.2 [小儿整形外科学]; R62 [整形外科学(修复外科学)];
学科分类号
摘要
Background: Spontaneous fracture of the humeral shaft in throwers is a rare but well-known phenomenon. Although it has been hypothesized that the biomechanics of the throw cause such fractures, it is not clear how or when the fractures occur in the pitching motion. Methods: The torque acting about the long axis of the humerus was calculated in 25 professional baseball pitchers throwing in game situations. Results: Peak humeral axial torque reached a mean value of 92 +/- 16 Nm near the time of maximum shoulder external rotation at the end of the cocking phase. This torque tended to externally rotate the distal end of the humerus relative to its proximal end. The direction of the torque was consistent with the external rotation spiral fractures of the humerus noted to occur in throwers. The magnitude of the peak humeral torque averaged 48% of the theoretical torsional strength of the humerus, suggesting that repetitive stress plays a role in humeral shaft fractures. Conclusions: Fractures are most likely to occur near the time of maximum shoulder external rotation when humeral torque peaks. Pitchers whose elbows were more extended at stride foot contact tended to have lower peak humeral torques.
引用
收藏
页码:892 / 898
页数:7
相关论文
共 40 条
[1]
Abdel-Aziz Y.I., 1971, P S CLOS RANG PHOT, V18, P103, DOI [10.14358/PERS.81.2.103, DOI 10.1080/10671188.1967.10616517, DOI 10.14358/PERS.81.2.103]
[2]
Atwater A E, 1979, Exerc Sport Sci Rev, V7, P43
[3]
BIEZE J, 1999, BIOMECHANICS AUG, P76
[4]
SPONTANEOUS FRACTURES OF THE HUMERUS DURING PITCHING - A SERIES OF 12 CASES [J].
BRANCH, T ;
PARTIN, C ;
CHAMBERLAND, P ;
EMETERIO, E ;
SABETELLE, M .
AMERICAN JOURNAL OF SPORTS MEDICINE, 1992, 20 (04) :468-470
[5]
MECHANISM OF SPIRAL FRACTURE OF HUMERUS - REPORT OF 129 CASES FOLLOWING THROWING OF HAND GRENADES [J].
CHAO, SL ;
MILLER, M ;
TENG, SW .
JOURNAL OF TRAUMA, 1971, 11 (07) :602-&
[6]
CLAUSER CE, 1969, 6970 WRIGHT PATT AIR
[7]
DiCicco J D, 1993, J Orthop Trauma, V7, P90, DOI 10.1097/00005131-199302000-00017
[8]
BIOMECHANICS OF PITCHING WITH EMPHASIS UPON SHOULDER KINEMATICS [J].
DILLMAN, CJ ;
FLEISIG, GS ;
ANDREWS, JR .
JOURNAL OF ORTHOPAEDIC & SPORTS PHYSICAL THERAPY, 1993, 18 (02) :402-408
[9]
DYNAMICS OF THE SHOULDER AND ELBOW JOINTS OF THE THROWING ARM DURING A BASEBALL PITCH [J].
FELTNER, M ;
DAPENA, J .
INTERNATIONAL JOURNAL OF SPORT BIOMECHANICS, 1986, 2 (04) :235-259
[10]
FELTNER ME, 1984, THESIS INDIANA U