Lower extremity kinematics and ground reaction forces after prophylactic lace-up ankle bracing.

CONTEXT Long-term effects of ankle bracing on lower extremity kinematics and kinetics are unknown. Ankle motion restriction may negatively affect the body's ability to attenuate ground reaction forces (GRFs). OBJECTIVE To evaluate the immediate and long-term effects of ankle bracing on lower extremity kinematics and GRFs during a jump landing. DESIGN Experimental mixed model (2 [group] x 2 [brace] x 2 [time]) with repeated measures. SETTING Sports medicine research laboratory. PATIENTS OR OTHER PARTICIPANTS A total of 37 healthy subjects were assigned randomly to either the intervention (n = 11 men, 8 women; age = 19.63 +/- 0.72 years, height = 176.05 +/- 10.58 cm, mass = 71.50 +/- 13.15 kg) or control group (n = 11 men, 7 women; age = 19.94 +/- 1.44 years, height = 179.15 +/- 8.81 cm, mass = 74.10 +/- 10.33 kg). INTERVENTION(S) The intervention group wore braces on both ankles and the control group did not wear braces during all recreational activities for an 8-week period. MAIN OUTCOME MEASURE(S) Initial ground contact angles, maximum joint angles, time to reach maximum joint angles, and joint range of motion for sagittal-plane knee and ankle motion were measured during a jump-landing task. Peak vertical GRF and the time to reach peak vertical GRF were assessed also. RESULTS While participants were wearing the brace, ankle plantar flexion at initial ground contact (brace = 35 degrees +/- 13 degrees , no brace = 38 degrees +/- 15 degrees , P = .024), maximum dorsiflexion (brace = 21 degrees +/- 7 degrees , no brace = 22 degrees +/- 6 degrees , P = .04), dorsiflexion range of motion (brace = 56 degrees +/- 14 degrees , no brace = 59 degrees +/- 16 degrees , P = .001), and knee flexion range of motion (brace = 79 degrees +/- 16 degrees , no brace = 82 degrees +/- 16 degrees , P = .036) decreased, whereas knee flexion at initial ground contact increased (brace = 12 degrees +/- 9 degrees , no brace = 9 degrees +/- 9 degrees , P = .0001). Wearing the brace for 8 weeks did not affect any of the outcome measures, and the brace caused no changes in vertical GRFs (P > .05). CONCLUSIONS Although ankle sagittal-plane motion was restricted with the brace, knee flexion upon landing increased and peak vertical GRF did not change. The type of lace-up brace used in this study appeared to restrict ankle motion without increasing knee extension or vertical GRFs and without changing kinematics or kinetics over time.

[1]  Bing Yu,et al.  Gender Comparison of Patellar Tendon Tibial Shaft Angle with Weight Bearing , 2003 .

[2]  Feza Korkusuz,et al.  Comparison of landing maneuvers between male and female college volleyball players. , 2004, Clinical biomechanics.

[3]  B. Elliott,et al.  Landing in netball: effects of taping and bracing the ankle. , 1999, British journal of sports medicine.

[4]  A. Komaroff,et al.  Benefits, risks, and costs of alternative approaches to the evaluation and treatment of severe ankle sprain. , 1984, Clinical orthopaedics and related research.

[5]  D. Rosenbaum,et al.  The Main Function of Ankle Braces is to Control the Joint Position before Landing , 2003, Foot & ankle international.

[6]  Randy J Schmitz,et al.  Effect of ankle taping and bracing on vertical ground reaction forces during drop landings before and after treadmill jogging. , 2002, The Journal of orthopaedic and sports physical therapy.

[7]  B T Bates,et al.  Contributions of lower extremity joints to energy dissipation during landings. , 2000, Medicine and science in sports and exercise.

[8]  S. McCaw,et al.  Prophylactic ankle stabilizers affect ankle joint kinematics during drop landings. , 1999, Medicine and science in sports and exercise.

[9]  J Mizrahi,et al.  Analysis of parameters affecting impact force attenuation during landing in human vertical free fall. , 1982, Engineering in medicine.

[10]  J. Dufek,et al.  Landing models for volleyball players: a longitudinal evaluation. , 1996, The Journal of sports medicine and physical fitness.

[11]  J. Dufek,et al.  Biomechanical Factors Associated with Injury During Landing in Jump Sports , 1991, Sports medicine.

[12]  E S Grood,et al.  A joint coordinate system for the clinical description of three-dimensional motions: application to the knee. , 1983, Journal of biomechanical engineering.

[13]  G. Rovere,et al.  Retrospective comparison of taping and ankle stabilizers in preventing ankle injuries , 1988, The American journal of sports medicine.

[14]  M. Schwellnus,et al.  A Fivefold Reduction in the Incidence of Recurrent Ankle Sprains in Soccer Players Using the Sport-Stirrup Orthosis , 1994, The American journal of sports medicine.

[15]  L M Bouter,et al.  A one season prospective cohort study of volleyball injuries , 2004, British Journal of Sports Medicine.

[16]  C. Ingersoll,et al.  Long-term ankle brace use does not affect peroneus longus muscle latency during sudden inversion in normal subjects. , 2000, Journal of athletic training.

[17]  S Toksvig-Larsen,et al.  Validation of a functional method for the estimation of hip joint centre location. , 1999, Journal of biomechanics.

[18]  P. Devita,et al.  Effect of landing stiffness on joint kinetics and energetics in the lower extremity. , 1992, Medicine and science in sports and exercise.

[19]  K. An,et al.  Estimate of the Optimum Cutoff Frequency for the Butterworth Low-Pass Digital Filter , 1999 .

[20]  J. Garrick The frequency of injury, mechanism of injury, and epidemiology of ankle sprains* , 1977, The American journal of sports medicine.

[21]  P. Willems,et al.  Stability of the Braced Ankle , 1996, The American journal of sports medicine.

[22]  Bing Yu,et al.  Lower extremity biomechanics during the landing of a stop-jump task. , 2006, Clinical biomechanics.

[23]  H. Prapavessis,et al.  Effects of instruction in jumping technique and experience jumping on ground reaction forces. , 1999, The Journal of orthopaedic and sports physical therapy.

[24]  C. Ingersoll,et al.  Influence of ankle support on joint range of motion before and after exercise: a meta-analysis. , 2000, The Journal of orthopaedic and sports physical therapy.

[25]  J. Dufek,et al.  The evaluation and prediction of impact forces during landings. , 1990, Medicine and science in sports and exercise.

[26]  J. Delee,et al.  The Incidence of Injury in Texas High School Basketball , 1999, The American journal of sports medicine.

[27]  C D Ingersoll,et al.  Peroneus longus stretch reflex amplitude increases after ankle brace application , 2003, British journal of sports medicine.

[28]  T. Hewett,et al.  NEUROMUSCULAR TRAINING IMPROVES PERFORMANCE AND LOWER‐EXTREMITY BIOMECHANICS IN FEMALE ATHLETES , 2005, Journal of strength and conditioning research.

[29]  P. Goldie,et al.  A prospective study of injuries in basketball: a total profile and comparison by gender and standard of competition. , 2001, Journal of science and medicine in sport.

[30]  N. Matsusaka,et al.  Effect of Ankle Disk Training Combined with Tactile Stimulation to the Leg and Foot on Functional Instability of the Ankle , 2001, The American journal of sports medicine.

[31]  R. Nelson,et al.  The shock attenuation role of the ankle during landing from a vertical jump. , 1988, Medicine and science in sports and exercise.