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Injured reserve list

Injured reserve list is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Injured reserve list rather than just read about it. In short: The injured reserve list (abbr. IR list) is a designation used in North American professional sports leagues for athletes who suffer injuries and become unable to play.

Key takeaways

  • Injured reserve list belongs to science; place it in that map before memorising details.
  • Learn the definition first, then one example that makes the definition concrete.
  • Connect Injured reserve list to a quantity you can measure, compute or draw — that is where exam questions come from.
  • Reproduce the core statement of Injured reserve list from memory before moving on to harder problems.

Reference excerpt

The injured reserve list (abbr. IR list) is a designation used in North American professional sports leagues for athletes who suffer injuries and become unable to play. The exact name of the list varies by league; it is known as "injured reserve" in the National Football League (NFL) and National Hockey League (NHL), the "injured list" in the Canadian Football League (CFL), the injured list (historically known as the "disabled list") in Major League Baseball (MLB) and Major League Soccer (MLS), and the "PUP List" in World Wrestling Entertainment (WWE). The National Basketball Association (NBA) does not have a direct analog to an injured reserve list, instead using a more general-purpose "inactive list" that does not require a player to be injured. Injured reserve lists are used because the rules of these leagues allow for only a certain numbers of players on each team's roster. Designating a player as "Injured/Reserve" frees up a roster spot, enabling the team to add a new replacement player during the injured athlete's convalescence. Injured reserve can be for serious injuries or illnesses.

NHL rules A player may be placed on injured reserve if he is unable to participate due to illness or injury, provided that the player had passed the club's initial physical examination at the start of the season. To qualify for the IR due to injury, that injury must be sufficient (in the opinion of the team's medical staff) to render the player unable to participate for the seven days following that injury. Once placed on IR, the team may then replace the player on their roster. The player on IR may not return to active play for seven days, although they may participate in non-competitive events such as practice, meetings, etc. The NHL also has an LTIR (Long-Term Injured Reserve) list, for long term injuries. The LTIR list requires the player to be out of play for 24 days and 10 games.

NFL rules A team may place a player on injured reserve (reserve/injured list) who is "not immediately available for participation with a club". Generally, these players may not practice or return to the active roster for the rest of the season (including postseason games or the Pro Bowl) in which they are placed on injured reserve but are allowed to be with the team. Starting in 2012 the NFL and the NFLPA reached an agreement allowing one player placed on injured reserve to be brought back to the active roster. Provided that the player was on the final 53-man preseason roster (a rule exempted for the 2012 season) and that the injury was deemed to keep this player unable to practice or play football for an estimated six weeks, the player may be allowed to practice after Week 6 and be activated to play after Week 8. In 2017 the rule was changed to allow up to two players to return from injured reserve after Week 8. In 2018 the rule was slightly modified to account for teams' bye weeks: players became eligible to return only after their team had played eight games instead of after eight weeks. In the wake of the COVID-19 pandemic, teams were allowed to re-activate an unlimited number of players after a minimum of three games each. In 2022, a limit of eight players was reintroduced, and the minimum duration increased to four games. In 2024 teams making the playoffs were granted two additional activations for postseason use only, for a maximum of ten; any activations not used in the regular season can carry over. Teams may also place a player on injured reserve with a minor injury designation, but the team must release the player once he is healthy. During the preseason, the league also allows players with long-term, but not season-ending, injuries to be placed into one of three designations: physically unable to perform (PUP) for injuries sustained during the previous season or during offseason training activities (a player who passes their physical at the beginning of training camp and practices is physically able to participate and is thus ineligible for the PUP list), reserve/non-football injury (NFI) for injuries sustained outside of team or league activities (despite the name, this includes lingering injuries from college football play, should an injured player be drafted and join the team), or reserve/non-football illness (NFI) for severe illnesses sustained by players unrelated to football. Players on the PUP list can be moved to the active roster after Week 6 of the regular season or placed on injured reserve. As of 2018, players on the NFI lists can begin practicing after Week 6 but cannot be activated until their team has played eight games. When a player from the NFI list begins practicing, a three-week window starts in which they are eligible to be moved to the active roster. If the player is not activated at the conclusion of the three-week window, they must remain on the NFI list for the rest of the season. During the regular season, players on the PUP list and injured reserve do not count against the league's 53-man roster maximum, but do count against the 90-man roster limit.

NBA rules

Due to abuses in the use of the injured reserve list, where some teams found it convenient to use the IR to stash players without independent medical oversight, the injured reserve has been renamed the Inactive List with the last collective bargaining agreement. Starting in the 2005–06 season, players can enter the inactive list one hour before tip-off for as little as one game. The inactive list has a minimum of one player and a maximum of three, subject to hardship rules when a team with three injured players already on its inactive list has a fourth player injured. Players sent to the NBA G League continues to count on a team's inactive list.

WNBA rules Unlike the NBA, the WNBA has no injury list as of the 2019 season. This notably affected the Seattle Storm going into that season, when reigning league MVP Breanna Stewart tore her right Achilles in the 2019 EuroLeague Women final. Because of the lack of an injured list, the Storm suspended Stewart without pay to free up a roster spot. (The WNBA would later make Stewart a paid league ambassador during her rehabilitation.) The league had an injury list when it began play in 1997; players placed on this list were required to sit out at least three games. In 2006, the league changed to an inactive list of up to two players, but it was eliminated after the 2008 season, when rosters were reduced to 11. WNBA rosters now consist of 12 players.

MLB rules

… excerpt ends here. Continue reading the full article.

Worked examples

Example 1 — a first encounter with Injured reserve list

Start with the simplest possible case. Write down what Injured reserve list claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Injured reserve list before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Injured reserve list ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Injured reserve list

In research
Injured reserve list appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry
Engineering practice reuses Injured reserve list in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom
Injured reserve list is common in secondary-school and first-year university syllabi. It links to neighbouring topics Sports injuries, Sports terminology, so understanding it makes those chapters shorter.
In everyday life
Look for Injured reserve list outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.
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How to study Injured reserve list in 20 minutes

  1. Read the reference excerpt below once, without taking notes.
  2. Close the page and write down what Injured reserve list means in your own words.
  3. Compare your version with the excerpt and mark what you missed.
  4. Work through the three examples above with pen and paper.
  5. Explain Injured reserve list out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Injured reserve list in simple terms?

The injured reserve list (abbr. IR list) is a designation used in North American professional sports leagues for athletes who suffer injuries and become unable to play.

Why does Injured reserve list matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Injured reserve list?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Injured reserve list.

Tags

  • Sports injuries
  • Sports terminology

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