In a split decision, the Kansas Court of Appeals on Friday held that the state Constitution, like the federal one, protected a woman’s right to an abortion and affirmed a lower court order blocking enforcement of a restrictive 2015 law.

The ruling resulted from a 7-to-7 vote by the appeals court.

In a tie, the lower-court ruling is upheld, but the split suggested that the interpretation of abortion rights under the state Constitution is far from settled and is likely to be considered by the state Supreme Court.

The blocked law, adopted last April and signed by Gov. Sam Brownback, a Republican, would ban the most common method used in second-trimester abortions, known as dilation and evacuation.

Doctors say that the method, which involves dilating the cervix and then extracting the fetus with tools, often tearing it apart in the process, is usually the safest abortion technique after about the 12th to 14th week of pregnancy.

But anti-abortion groups have labeled the method as “dismemberment abortion” and campaigned to make it illegal.

The Kansas law, the first of its kind in the United States, banned “knowingly dismembering a living unborn child and extracting such unborn child one piece at a time from the uterus.”

Last June, Judge Larry D. Hendricks of Shawnee County District Court in Topeka blocked enforcement of the new law pending a trial.

He based his decision on the due process clause in the Kansas Constitution, which he said offered the same protection of abortion rights as those afforded by the 14th Amendment to the federal Constitution, and said that the ban on what doctors called the safest method for many patients presented an illegal obstacle.

Carol Tobias, the president of National Right to Life, condemned Friday’s decision.

“The split decision by the appellate court tragically says it is acceptable to rip a fully formed living unborn child, limb by limb, from her mother’s womb,” she said in a written statement. “We do not think this will sit well with the majority of Kansans and changes will come.”

Advocates for abortion rights hailed the ruling as “a landmark victory for Kansas women,” in the words of Nancy Northup, president of the Center for Reproductive Rights, a New York-based legal group that challenged the Kansas law on behalf of doctors from one of the three abortion clinics operating in the state.

The decision, Ms. Northup said in a statement, affirms that Kansas women “have the right to safely and legally end a pregnancy under their state Constitution, free from political interference.”

The federal Constitution, under decisions by the Supreme Court, guarantees women a right to abortion until the fetus is viable outside the womb, usually around 24 weeks into pregnancy.

Legislatures may regulate abortion practices but may not place an “undue burden” on that right. Oklahoma adopted a similar ban on dilation and evacuation abortions last year that has also been blocked as a violation of the state Constitution.

Roughly 90 percent of abortions are performed within the first 12 weeks of pregnancy, usually using a suction method or medications that induce a miscarriage.

According to the Center for Reproductive Rights, the supreme courts of at least 10 states have ruled that their state Constitutions protect the right to abortion: Alaska, California, Florida, Massachusetts, Minnesota, Mississippi, Montana, New Jersey, New York and Tennessee. Lower courts in Connecticut, Kansas, Ohio and Oklahoma have also done so.