Finite Element Analysis of Mechanical Ocular Sequelae from Badminton Shuttlecock Projectile Impact

Abstract

PurposeWith the growing popularity of badminton worldwide, the incidence of badminton-related ocular injuries is expected to rise. The high velocity of shuttlecocks renders ocular traumas particularly devastating, especially with the possibility of permanent vision loss. This study investigated the mechanism behind ocular complications though simulation analyses of mechanical stresses and pressures upon shuttlecock impact. DesignComputational simulation study ParticipantsNone MethodsA 3-dimensional human eye model was reconstructed based on the physiological and biomechanical properties of various ocular tissues. FEA simulations involved a frontal collision with a shuttlecock projectile at 128.7 km/h (80 mph). Intraocular pressure changes and tissue stress were mapped and quantified in the following ocular structures: the limbus, ciliary body, zonular fibers, ora serrata, retina, and optic nerve head. Main Outcome MeasuresIntraocular pressure and tissue stress ResultsUpon shuttlecock impact, compressive force was transferred to the anterior pole of the cornea, propagating posteriorly to the optic nerve head. Deflection of forces anteriorly contributed to refractory oscillations of compressive and tensile stress of ocular tissue. Initial impact led to a momentary (< 1 ms) spike in intraocular pressure 5.66 MPa (42.5 x 103 mmHg) that radially distributed for a very brief instance (< 1 ms) of pressure at the trabecular meshwork of the iridocorneal angle of 1.25 MPa (9.4 x 103 mmHg). The lens had a maximal posterior displacement of 1.5 mm with peak zonular fiber tensile strain of 52%. The limbus, ciliary body, and ora serrata had a peak tensile stress of 5.16 MPa, 1.90 MPa, and 0.62 MPa, respectively. Compressive force from the sclera concentrated at the optic nerve head for a peak stress of 5.97 MPa while peak pressure from vitreous humor was 7.99 MPa. ConclusionShuttlecock impact led to a very brief, substantial rise in pressure and stress significant for tissue damage and subsequent complications, such as secondary glaucoma, angle recession, lens subluxation, hyphema, or retinal dialysis. Our findings offer valuable mechanistic insights into how ocular structures are affected by shuttlecock projectile impact to inform clinical assessments and treatment strategies, while highlighting the importance of protective eyewear in racket sports.