Most pregnant sows in the United States are housed singly in stalls. Small stall dimensions or restricted space can cause injuries. The problem of spatial restriction increases as the size of the sow increases during pregnancy. The study was designed to determine whether there is relationship between sow injuries and size of gestation stalls relative to sow size. A total of 267 pregnant sows were randomly selected from 4 farms. Sow and stall measurements were obtained, and injuries were scored on the basis of location, number, and depth. Ratios of stall length to sow length, and stall width to sow height were calculated. The results indicated that high injury scores were associated with low ratios of stall length to sow length and stall width to sow height. In other words, when the stall size relative to sow size was decreased, pregnant sows endured more injuries.