After four injury-addled years in Seattle, running back Rashaad Penny is on the open market.The 26-year-old had his most impressive stretch to end last season, but prior to 2021 he had not surpassed 100 carries of 500 yards from scrimmage in a season.Despite all the positive momentum for Penny, he isn't likely to get a long-term deal, said Dr. David Chao, ProFootballDoc.Penny's most severe injury was a torn left knee ACL in December 2019. He missed the remainder of the season and played just three games in 2020.He injured the same knee again in Jan. 2021 and underwent a clean-up surgery last June. Penny said after the surgery that he felt way faster.The ACL and second scope really derailed Penny's career, although he seems poised to finally meet his projections, Chao said.Even 2021 got off the a rocky start for the former No. 27 overall pick. He suffered a left calf injury Week 1 and missed five games, then was ineffective when he returned.Penny also suffered a hamstring injury Week 11 that kept him out the following week, but the former San Diego State rusher hit his stride in Week 14.In the final five games of the season, Penny averaged 134.2 rushing yards and amassed 6 rushing touchdowns, more than doubling his career total.He also led all running backs with 6.3 yards per attempt and set career highs in first-down runs, longest run, carries per season and rushing yards per season.Penny's price tag this offseason will be something to watch. The Seahawks declined to pick up the fifth-year option of his rookie deal, a decision that was made after Penny's third year expired.His contract with Seattle ended up as a four-year, $10.7 million deal.