Turns, Jumping and Landing: Shin and Foot Injuries in Dancers
http://chapman.edu/copa/dance/
The following article is an edited version of a chapter on Adolescent Dance Medicine co-written by Dr. Koutures and Kathleen LInzmeier, MD in Adolescent Medicine: State of the Art Reviews, Vol 26 No 1 published by the American Academy of Pediatrics in April, 2015. This information is not designed to suggest or confirm any individual diagnosis. Any injury deserves complete evaluation by a dance medicine specialist.
Advanced ballet dancers spend a great deal of time en pointe, which puts them at risk for foot injuries while in full en pointe and ankle injuries while in slight dorsiflexion (known as demi-pointe). While in full en pointe position, the ankle is relatively stable since the posterior lip of the tibia rests and locks on the calcaneus and the subtalar joint is locked with the heel in forefoot.
A dancer is more likely to acquire a midfoot than ankle sprain while in en pointe. Midfoot sprains result from a loss of balance while en pointe and performing spins. Lisfranc injuries involve fractures or fracture-dislocations in the middle of the foot at the base of the long metatarsal bones. Less common midfoot injuries include injuries to the dorsal ligaments between talus and navicular or the calcaneus and cuboid.
- GOAL: Seek immediate medical care with any twisting injury of the middle of the foot that results in pain, swelling or feeling of limited stability
The ankle is vulnerable to inversion injury when moving into slight dorsiflexion from en pointe position. As the ankle progressively inverts greater pressure is placed on the lateral ankle ligaments, particularly the anterior talofibular ligament. The talus is wider anteriorly and more narrow posteriorly. The inherent instability of the more narrow posterior talus combined with the vertical alignment of the anterior talofibular ligament make the ankle at risk for inversion while in plantarflexion but not fully in the more stable en point position.
Underlying hypermobility and prior history of ankle sprains are strong predictive factor for ankle sprains. Hypermobility of the ankle joint causes forces at the foot to be transferred proximally in suboptimal fashion thus leading to injury. The incidence of recurrent injury after initial acute ankle sprain has been reported to be as high as 70%. Ankle sprains lead to reduced subtalar and ankle motion which can lead to resultant increased compensatory stresses on muscle tendon units contributing to repetitive injury. Impaired balance and proprioception can additionally follow ankle sprains and can last for up to 2 weeks following injury despite active rehabilitation.
- GOAL: Take appropriate time and get experienced guidance to allow maximal recovery from ankle sprains as an Increased risk for injury can occur if strength and coordination are not fully restored.
Dancers are additionally susceptible to several unique fractures of the 5th metatarsal bone. Avulsion fracture of the styloid process of the 5th metatarsal, involving a fracture line perpendicular to the long axis of the bone, is associated with lateral ankle sprains as it is usually caused by sudden inversion of the foot. Acute metaphyseal-diaphyseal junction fractures, known as Jones fractures, occur with adduction of the 5th metatarsal often while the foot is plantarflexed and have a predilection for malunion due to the poor blood supply as the metaphyseal-diaphyseal junction is a vascular watershed zone. Oblique spiral fracture through the mid to distal portion of the 5th metatarsal are known as “Dancer’s fractures” and usually occur with twisting or inversion of the foot while on demi pointe.
Repetitive Landing and Jumping Resulting in Foot and Shin Injuries
The repetitive nature of dance training can lead to many overuse injuries involving the feet and shins, especially if dancers have any underlying limiting anatomy, poor form, or insufficient rest. The spectrum of repetitive overload injury can range from soft tissue injury to bone stress reactions (increased bone resorption and production without frank fracture line) and eventually true stress fractures.
Hallux rigidus (reduced motion of the big toe) is caused by repetitive flexion and hyperextension of the metatarsalphalangeal joint. It is usually the result of pronation of the great toe when attempting to force turnout leading to restriction of full dorsiflexion of the first metatarsalphalangeal joint with resultant prominent spur formation on the dorsal aspect of the first metatarsal head that prevents performing full relevé.
- Many dancers with reduced first big toe motion accommodate for this limitation by putting more pressure on the outside of the foot, which can lead to ankle sprains and fractures of the fifth metatarsal.
- GOAL: Increase first toe range of motion to reduce abnormal forces on the outside of the foot and also at the ankle, knee and hip
Shin splints, or medial tibial stress syndrome, describe a traction periostitis that is associated with diffuse anteromedial or posteromedial tibial pain that typically involves the distal one third of the tibia. While medial tibial stress syndrome occurs at the beginning of the season after a long period of activity, dancers are also prone to tibial stress fractures that usually occur in the middle to late season. Lower risk tibial stress fractures involve the proximal lateral or distal medial tibia. Dancers are also particularly at risk for traction fractures of the anterior tibial cortex that present with acute disability in male dancers after landing from a jump or more gradual onset in female dancers who might have poor bone health.
The sesamoids are particularly at risk for stress injury given their vulnerable location beneath the base of the first metatarsal in the substance of the flexor hallucis brevis tendon. An exaggerated turned out position can also lead to sesamoid overload due to rolling out, which increases medial loading of the first metarsal-phalangeal joint.
- The medial (inside) sesamoid bears more stress both in releve and when dancers walk turned out.
- GOAL: Correct turn out and plie positions so that the middle of the kneecap is over the 2nd toe can reduce stress on sesamoids and the inside of the foot.
Another common site of stress fractures in dancers is the base of the second metatarsal, which is the longest metatarsal and therefore bears the bulk of weight while in demipointe position. The distal aspect of the fibula, usually 10 cm above the lateral malleolus in the distal third of the shaft may also be prone to stress fractures which usually occur in the weight bearing leg and are frequently the result of poor balance and fatigue when initiating a turn.
- GOAL: Any midfoot pain, especially on the top of the arch of the inside of the foot, must be fully assessed for a navicular stress fracture which is a high risk traction injury due to repetitive jumping and landing on a plantarflexed foot.
In the majority of stress fracture injuries plain films are typically negative and diagnosis instead requires Magnetic Resonance Imaging. Rest from loading activities is usually necessary for healing for at least a minimum of 4 weeks, during which a dancer can utilize yoga, pilates, water based exercise and other non-impact forms of rehabilitation to correct biomechanical issues. Higher risk stress fractures, such as the anterior tibial cortex and tarsal navicular, require initial non-weight bearing on the injured limb, prolonged rest (several months) or surgical intervention and have a higher risk of adversely influencing the career of a dancer.
- GOAL: While no performer wants to be removed from dance for any period of time, knowing those situations that require prolonged rest and seeking appropriate specialty care can be the difference between ability to return to dance and the end of a career.
Are there any other dance-related foot or shin injuries that should be mentioned? Do you have any practical tips or experience to help prevent or treat these common dance problems?
