Fig. 1.

Extension strength by number of resected muscles. Dots denote median extension strength values. The solid line shows the significant difference between the resection of one and 1.5 muscles (Mann-Whitney test, *p = 0.004). The horizontal line shows the cutoff value for extension strength (56.2%) at which acceptable results can be obtained. Strength at least equivalent to the cutoff value was observed with resection of up to 2.5 muscles.