Morton metatarsalgia
Meaning of morton metatarsalgia: For the purposes of this Statement of Principles, Morton metatarsalgia: (a) means an entrapment or irritation of the interdigital plantar nerve between the metatarsal heads, causing an acquired neuropathy; and (b) excludes peripheral neuropathy.
Reasonable Hypothesis (RH) — Statement of Principles No. 77 of 2019
At least one of the following factors must as a minimum exist before it can be said that a reasonable hypothesis has been raised connecting Morton metatarsalgia or death from Morton metatarsalgia with the circumstances of a person's relevant service:
- (1)wearing footwear which compresses the affected forefoot or increases the pressure on the ball of the affected foot, or has a high heel, for at least four hours per day on more days than not, for at least the one year before the clinical onset of Morton metatarsalgia;
- (2)having an injury to the foot which damages or compresses the interdigital plantar nerve within the affected intermetatarsal space, within the one year before the clinical onset of Morton metatarsalgia;
- (3)undergoing surgery to the foot which damages or compresses the interdigital plantar nerve within the affected intermetatarsal space, within the one year before the clinical onset of Morton metatarsalgia;
- (4)having a deformity of the affected foot from the specified list of deformities of the foot, which damages or compresses the interdigital plantar nerve within the affected intermetatarsal space, at the time of the clinical onset of Morton metatarsalgia;
Note: specified list of deformities of the foot is defined in the Schedule 1 - Dictionary.
- (5)having an inflammatory arthritis which damages or compresses the interdigital plantar nerve within the affected intermetatarsal space, at the time of the clinical onset of Morton metatarsalgia;
- (6)wearing footwear which compresses the affected forefoot or increases the pressure on the ball of the affected foot, or has a high heel, for at least four hours per day on more days than not, for at least the one year before the clinical worsening of Morton metatarsalgia;
- (7)having an injury to the foot which damages or compresses the interdigital plantar nerve within the affected intermetatarsal space, within the one year before the clinical worsening of Morton metatarsalgia;
- (8)undergoing surgery to the foot which damages or compresses the interdigital plantar nerve within the affected intermetatarsal space, within the one year before the clinical worsening of Morton metatarsalgia;
- (9)having a deformity of the affected foot from the specified list of deformities of the foot, which damages or compresses the interdigital plantar nerve within the affected intermetatarsal space, at the time of the clinical worsening of Morton metatarsalgia;
Note: specified list of deformities of the foot is defined in the Schedule 1 - Dictionary.
- (10)having an inflammatory arthritis which damages or compresses the interdigital plantar nerve within the affected intermetatarsal space, at the time of the clinical worsening of Morton metatarsalgia;
- (11)inability to obtain appropriate clinical management for Morton metatarsalgia;
Aggravation-only factors: the factors in subsections 9(6) to (11) apply only to material contribution to, or aggravation of, the condition where it was suffered or contracted before or during (but did not arise out of) the person’s relevant service.
Balance of Probabilities (BoP) — Statement of Principles No. 78 of 2019
11 factors
At least one of the following factors must exist before it can be said that, on the balance of probabilities, Morton metatarsalgia or death from Morton metatarsalgia is connected with the circumstances of a person's relevant service:
- (1)wearing footwear which compresses the affected forefoot or increases the pressure on the ball of the affected foot, or has a high heel, for at least four hours per day on more days than not, for at least the two years before the clinical onset of Morton metatarsalgia;
- (2)having an injury to the foot which damages or compresses the interdigital plantar nerve within the affected intermetatarsal space, within the six months before the clinical onset of Morton metatarsalgia;
- (3)undergoing surgery to the foot which damages or compresses the interdigital plantar nerve within the affected intermetatarsal space, within the six months before the clinical onset of Morton metatarsalgia;
- (4)having a deformity of the affected foot from the specified list of deformities of the foot, which damages or compresses the interdigital plantar nerve within the affected intermetatarsal space, at the time of the clinical onset of Morton metatarsalgia;
Note: specified list of deformities of the foot is defined in the Schedule 1 - Dictionary.
- (5)having an inflammatory arthritis which damages or compresses the interdigital plantar nerve within the affected intermetatarsal space, at the time of the clinical onset of Morton metatarsalgia;
- (6)wearing footwear which compresses the affected forefoot or increases the pressure on the ball of the affected foot, or has a high heel, for at least four hours per day on more days than not, for at least the two years before the clinical worsening of Morton metatarsalgia;
- (7)having an injury to the foot which damages or compresses the interdigital plantar nerve within the affected intermetatarsal space, within the six months before the clinical worsening of Morton metatarsalgia;
- (8)undergoing surgery to the foot which damages or compresses the interdigital plantar nerve within the affected intermetatarsal space, within the six months before the clinical worsening of Morton metatarsalgia;
- (9)having a deformity of the affected foot from the specified list of deformities of the foot, which damages or compresses the interdigital plantar nerve within the affected intermetatarsal space, at the time of the clinical worsening of Morton metatarsalgia;
Note: specified list of deformities of the foot is defined in the Schedule 1 - Dictionary.
- (10)having an inflammatory arthritis which damages or compresses the interdigital plantar nerve within the affected intermetatarsal space, at the time of the clinical worsening of Morton metatarsalgia;
- (11)inability to obtain appropriate clinical management for Morton metatarsalgia;
Aggravation-only factors: the factors in subsections 9(6) to (11) apply only to material contribution to, or aggravation of, the condition where it was suffered or contracted before or during (but did not arise out of) the person’s relevant service.








