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Fifth metatarsal stress fractures have a high incidence of nonunion, delayed union, and refracture i ndependent of postinjury treatment. After screw fixation for the treatment of 5 th metatarsal stress fractures, many patients are being treated with a rigid carbon graphite foot plate (CFP) to decrease plantar loading. PURPOSE : To determine if total foot, lateral midfoot (LMF) and lateral forefoot (LFF) loading (peak pressure, contact area, and forcetime integral) were decreas ed with the use of the CFP. METHODS : Plantar loading in 13 healthy male, collegiate, recreational athletes was evaluated using the PedarX inshoe system collecting at 100Hz (Novel, St. Paul , MN, USA). Exclusion criteria were any history of lower extremity injuries in the past six months, foot or ankle surgery within the past 3 years, and previous metatarsal stress fractures. Prior to data collection all subjects signed informed consent. Subjects completed 7 simulated lay ups in a standard running shoe with and without a CFP. In order to complete the task properly, subjects needed to jump and land on the same foot, which was the foot used for analysis. A 2x2 repeated measures ANOVA was used to compare the takeoff (TO) and landing (LD) both with and without the CFP (α=0.05). RESULTS : The subjects had an average height of 1.76 ± 0.08 m, mass of 73.38 ± 9.87 kg, and age of 21.6 ± 2.75 years. The total foot maximum force was significantly greater during landing when compared with the take off (p=0.012). No other significant differences existed between these two tasks. Independent of the task, the total foot contact area was significantly decreased in the CFP condition (p<0.001), while the total foot peak pressure was increased with the CFP (p<0.001). LMF Contact area was decreased (p=0.016) when wearing the CFP. No differences in the forcetime integral were found i n the LMF or LFF. Peak pressure was increased in the LMF (p<0.001), and LFF (p=0.002) when wearing the CFP. CONCLUSIONS : In this initial study, the results indicate that the CFP is ineffective at reducing plantar loading beneath the 5 th metatarsal during jumping and landing in uninjured controls. However, CFP needs to be examined to determine its role in other sporting maneuvers and footwear in patients with a 5 th metatarsal fracture history.

Effect of Carbon Graphite Foot Plate on Loading During Jumping and Landing