Characterisation of the responsive properties of two running-specific prosthetic models.

BACKGROUND

The need for information regarding running-specific prosthetic properties has previously been voiced. Such information is necessary to assist in athletes' prostheses selection.

OBJECTIVES

This study aimed to describe the characteristics of two commercially available running-specific prostheses.

STUDY DESIGN

The running-specific prostheses were tested (in an experimental setup) without the external interference of athlete performance variations.

METHODS

Four stiffness categories of each running-specific prosthetic model (Xtend and Xtreme) were tested at seven alignment setups and three drop masses (28, 38 and 48 kg). Results for peak ground reaction force (GRF), contact time ( t), flight time ( t), reactive strength index (RSI) and maximal compression (Δ L) were determined during controlled dropping of running-specific prostheses onto a force platform with different masses attached to the experimental setup.

RESULTS

No statistically significant differences were found between the different setups of the running-specific prostheses. Statistically significant differences were found between the two models for all outcome variables (GRF, Xtend > Xtreme; t, Xtreme > Xtend; t, Xtreme > Xtend; RSI, Xtend > Xtreme; Δ L, Xtreme > Xtend; p < 0.05).

CONCLUSION

These findings suggest that the Xtreme stores more elastic energy than the Xtend, leading to a greater performance response. The specific responsive features of blades could guide sprint athletes in their choice of running-specific prostheses. Clinical relevance Insights into the running-specific prosthesis (RSP) properties and an understanding of its responsive characteristics have implications for athletes' prosthetic choice. Physiologically and metabolically, a short sprint event (i.e. 100 m) places different demands on the athlete than a long sprint event (i.e. 400 m), and the RSP should match these performance demands.