What is Freiberg’s Infraction?
This is a condition that can result in severe arthritis of the lesser metatarso-phalangeal joints (MTPJ). There are several theories regarding the exact underlying pathology but most experts agree that it is the result of interference in the blood supply to the metatarsal head which leads to joint breakdown. It is most commonly seen in the 2nd and 3rd toes.
What are the symptoms of Freiberg’s Infraction?
If caught early then pain may be the only symptom. It can be associated with swelling, stiffness and deformity as the condition develops.
How is Freiberg’s Infraction diagnosed?
History and examination by a Foot and Ankle expert are important as early presentations can often not be seen on X-ray. If the joint is yet to degenerate then the only modality that will reveal the diagnosis is MRI. More advanced disease will be seen as arthritis of the MTPJ occurs with flattening of the joint surfaces and osteophyte formation.
How is Freiberg’s Infraction treated?
Treatment of the early stages of the disease is aimed at maintaining the normal contour of the joint. This is done by offloading the joint in an orthopaedic shoe or boot whilst the inflammation settles. If pain persists then steroid injections can play a role.
Treating a joint that has developed arthritic changes poses a challenge. The lesser MTPJs are not a joint that one would choose to fuse so the aim is to improve movement and reduce irritation. Debridement of the joint rough edges has been shown to improve pain and stiffness but often the patient will continue to experience some symptoms. The disease tends to mainly affect the top side of the joint so, in some cases, an osteotomy to bring the bottom of the joint to a more elevated level can be successful at improving symptoms. A pre-operative CT scan is needed for this procedure.