David Mouser (“Mouser”) and Donald Green (“Green”) (together “plaintiffs”) appeal from a final order entered in the United States District Court for the Eastern District of Missouri 2 granting judgment as a matter of law (“JAML”) in favor of Caterpillar, Inc. (“defendant”), on plaintiffs’ claims stemming from an industrial accident and conditionally granting defendant’s motion for a new trial. See Mouser v. Caterpillar, Inc., No. 4:98CV744 (E.D.Mo. Mar. 5, 2002) (hereinafter “slip op.”). For reversal, plaintiffs argue that the district court erred in *659 granting JAML in favor of defendant because the rubber mixer that injured them was a dangerous chattel instead of a fixture on defendant’s real property. Plaintiffs argue that because the district court improperly concluded that defendant permanently annexed the mixer to its rubber manufacturing plant, the district court erred in holding that Missouri premises liability law applied and that their recovery was limited to workers’ compensation benefits. Plaintiffs also argue that the district court erred in denying their motion to amend their pleadings to conform to the evidence at trial and in conditionally granting defendant’s motion for a new trial. For the reasons discussed below, we affirm the judgment of the district court.
Jurisdiction in the district court was proper based on 28 U.S.C. § 1382. Jurisdiction in this court is proper based upon 28 U.S.C. § 1291. The notice of appeal was timely filed pursuant to Fed. R.App. P. 4(a).
FACTS
The facts and procedural history are largely drawn from the order of the district court. Plaintiffs were employees of Topeka Machinery Exchange (“TME”), an independent contractor hired by defendant to repair a 3D Danbury rubber mixer at defendant’s rubber manufacturing plant in Booneville, Missouri. The mixer was installed at the Booneville plant in 1992 as part of a rubber processing system which includes the mixer, the mill, and multilevel platforms and mezzanines where operators access different levels of the mixing system. The mixer must be integrated into the plant’s gas, electric, water, and ventilation systems in order to function. It is approximately twenty feet tall, or approximately fifty feet tall if the rubber mixing “hoppers” are included, and weighs approximately twenty tons. On March 21, 1997, plaintiffs were injured when the stop-pin holding a 900-pound floating weight inside the mixer’s main hopper came loose as the crew was reattaching it to the mixer. As a result, the weight crushed Mouser’s left hand and Green’s right hand.
In 1998, plaintiffs filed a lawsuit in the Circuit Court for the City of St. Louis, Missouri. Plaintiffs’ action was later removed to the United States District Court for the Eastern District of Missouri. 3 Plaintiffs’ original complaint brought products liability claims alleging that the safety stop-pin was defective. In its answer, defendant argued that plaintiffs’ complaint failed to state a claim upon which relief could be granted and that plaintiffs’ remedy was limited to workers’ compensation benefits. On August 20, 1999, plaintiffs filed a second amended complaint, restating their products liability claim against all defendants and asserting an additional, independent tort claim against defendant captioned “Premises Liability.” 4 Plaintiffs’ premises liability claim alleged that the stop-pin assembly on the rubber mixer constituted a dangerous condition, which created a duty for defendant to warn, remove, or barricade the danger, and that *660 defendant’s failure to do so caused plaintiffs’ injuries. Defendant’s answer to the second amended complaint adopted and incorporated the affirmative defenses asserted in its earlier answer. The case proceeded through discovery.
On October 2, 2000, the district court granted defendant’s motion for summary judgment on plaintiffs’ products liability claim. The district court, however, denied defendant’s motion for summary judgment as to plaintiffs’ premises liability claim and permitted plaintiffs to proceed to trial. In their trial brief, plaintiffs summarized their claim against defendant as premises liability, arguing that the safety stop-pin assembly constituted a dangerous condition on the land for which defendant owed a duty to warn its invitees. In response, defendant argued that the stop-pin was not unsafe, and that, even if it were, plaintiffs were aware that parts of the mixer might not be functioning properly because they were on the premises to repair the mixer. On October 27, 2000, the case was submitted to the jury, which was unable to reach a verdict, and the district court declared a mistrial.
The case was set for retrial on July 30, 2001. On July 25, 2001, defendant filed a supplemental trial brief arguing for the first time that plaintiffs could not recover on their premises liability claim because landowners are not liable under Missouri law to the employees of independent contractors for injuries sustained while working if the employees are covered by workers’ compensation insurance. The contract between defendant and TME required TME to maintain workers’ compensation insurance for its employees. On July 30, 2001, plaintiffs filed a supplemental trial brief which argued that defendant’s newly raised defense was inapplicable because their injuries were caused by defendant’s negligent bailment of a dangerous chattel, namely the mixer, without warning of the potentially dangerous condition. The case proceeded to trial on July 30, 2001. On August 1, 2001, at the close of plaintiffs’ case, defendant moved for JAML, arguing that plaintiffs could not recover on their premises liability claim because they were covered by workers’ compensation insurance. In response, plaintiffs argued that their claim for recovery was based upon the fact that the mixer was a dangerous chattel and defendant’s premises liability defenses were therefore inapplicable.
On August 2, 2001, at the close of all the evidence, defendant again moved for JAML, and plaintiffs filed a motion for leave to amend their complaint to conform to the evidence. The district court denied defendant’s motion, and the case was submitted to the jury. Plaintiffs’ proposed verdict director for their premises liability claim was modeled after Missouri Approved Instruction No. 22.03'— “Invitee Injured.” Plaintiffs did not submit any additional verdict directors. The jury returned verdicts in favor of plaintiffs. Defendant then renewed its earlier motion for JAML and in the alternative moved for a new trial.
On March 5, 2002, the district court issued an order granting defendant’s motion for JAML and conditionally granting a new trial. In its order, the district court stated that the case turned on whether the rubber mixer and its components were a fixture of the real estate, and thus part of the premises, or a chattel that defendant turned over to plaintiffs for repairs. The district court noted that under Missouri law “[a] fixture is an article of personal property which has been so annexed to the real estate that it is regarded as part of the land.” Slip op. at 10 (quoting
In
re
Marla Jean, Inc.,
The district court also held that, because plaintiffs’ claim was governed by premises liability law, their damages recovery was limited to workers’ compensation benefits. The district court noted that, under Missouri law, where an employee of an independent contractor is injured on a landowner’s property during the course of working for the independent contractor, the landowner cannot be liable to the injured employee if the independent contractor is required to carry workers’ compensation insurance.
Id.
at 16. (citing
Matteuzzi v. Columbus P’ship, L.P.,
The district court also conditionally granted defendant’s alternative motion for a new trial pursuant to Fed.R.Civ.P. 50(c)(1) because defendant would have been entitled to a new trial if the mixer were found to be a chattel. Id. at 20. The district court noted that the claim was submitted to the jury with instructions modeled after Missouri Approved Instruction No. 22.03, “Invitee Injured.” 5 Id.
*662 These instructions differed from Missouri Approved Instruction No. 25.10(A), “Negligently Supplying a Dangerous Instrumentality,” which requires additional elements of proof. 6 Id. at 21. Therefore, the district court concluded that, if the mixer were a chattel, defendant was prejudiced by the submission of the premises liability instruction because plaintiffs bore a lesser burden under that instruction. Id. at 21-22. Because the instructional error would have had a prejudicial effect on the merits of the case, the district court held that defendant would have been entitled to a new trial. Id. at 22.
This appeal followed.
DISCUSSION
We review the district court’s decision to grant JAML
de novo,
applying the same standards as the district court.
Hunt ex rel. Hunt v. Lincoln County Mem’l Hosp.,
I.
We first address whether the district court correctly found that the mixer was a fixture of defendant’s real estate as opposed to a chattel as argued by plaintiffs. Plaintiffs contend that the district court incorrectly held that the mixer was annexed to defendant’s plant. As noted by the district court, under Missouri law, annexation requires a showing of: (1) annexation to the realty; (2) adaptation to the use to which the realty is devoted; and (3) the intent of the annexor that the object becomes a permanent accession to the land.
Sears,
Plaintiffs similarly contend that the district court erred in holding that the mixer was adapted to the use to which the realty was devoted. Plaintiffs argue that defendant failed to meet the adaptation element of the
Sears
test because the mixer was not peculiarly adapted to defendant’s rubber making facility. Plaintiffs note that in another annexation case,
Rothermich v. Union Planters Nat’l Bank,
We review the district court’s interpretation of Missouri law
de novo. Hammer v. City of Osage Beach,
II.
Plaintiffs also argue that the district court improperly applied Missouri law regarding premises liability. Plaintiffs note that the principal case relied on by the district court,
Matteuzzi,
and its progeny all involve construction or renovation of a building.
See, e.g., Matteuzzi,
Again, we review the district court’s interpretation of Missouri law
de novo. Hammer,
III.
Plaintiffs next argue that the district court erred in denying their motiqn to amend their pleadings to conform to the evidence presented at trial. Plaintiffs maintain that the district court erred in holding that such an amendment would be “futile” because the mixer was a fixture of the real property. Plaintiffs note that the district court previously stated in response to defendant’s oral objection to plaintiffs’ motion to amend that, even if such a motion was not previously submitted formal *666 ly, “it was done de facto by virtue of the instructions that were submitted to the jury [at the close of the first trial].” Trial Transcript Vol. VI at 36. Plaintiffs therefore argue that, because the district court recognized that the pleadings were previously amended de facto, and because the district court’s conclusion that the rubber mixer was a fixture was erroneous, the district court abused its discretion in denying the motion to amend.
We review the district court’s denial of leave to amend for abuse of discretion.
Grandson v. Univ. of Minn.,
When issues not raised by the pleadings are tried by express or implied consent of the parties, they shall be treated in all respects as if they had been raised in the pleadings. Such amendment to the pleadings as may be necessary to cause them to conform to the evidence and to raise these issues may be made upon motion of any party at any time, even after judgment.
Fed. R. Civ. Proc. 15(b). Amendments under Rule 15(b) are to be liberally granted “where necessary to bring about the furtherance of justice and where the adverse party will not be prejudiced.”
McLaurin v. F.C. Prater,
IV.
Because we uphold the district court’s grant of JAML and denial of plaintiffs’ leave to amend, we decline to address the district court’s grant of a conditional new trial.
CONCLUSION
Accordingly, the judgment of the district court is affirmed.
Notes
. The Honorable Frederick R. Buckles, Chief United States Magistrate Judge for the Eastern District of Missouri, who tried this case pursuant to the consent of the parties under 28 U.S.C. § 636(c).
. Although defendant owned the mixer, it was designed, manufactured, and sold by separate entities, Soberay Machine & Equipment Co. ("Soberay”) and Louis Perry & Associates, Inc. ("Louis Perry”). Plaintiffs brought products liability claims against Soberay and Louis Perry in their complaints. Although some of the claims survived summary judgment, Soberay and Louis Perry settled with plaintiffs prior to the commencement of the first trial, leaving Caterpillar the sole defendant.
. In their first amended complaint, plaintiffs added additional defendants to their action and reasserted their products liability claims against all defendants.
. The verdict director submitted to the jury-read as follows:
[Y]ou must assess a percentage of fault to defendant Caterpillar, Inc.[,] if you believe:
First, at the time of the accident referred to in the evidence, there was an inadequate safety stop pin mechanism on the rubber mixer at Defendant’s Caterpillar facility, *662 and as a result the rubber mixer was not reasonably safe, and
Second, Defendant, Caterpillar, Inc., knew or by using ordinary care could have known of this condition, and
Third, Defendant Caterpillar, Inc., failed to use ordinary care to remove it, repair it, or warn of it, and,
Fourth, such failure to exercise ordinary care directly caused or directly contributed to cause damage to Plaintiff[s].
See slip op. at 20 (citing Jury Instructions Nos. 13 and 16).
. Under Missouri Approved Instruction No. 25.10(A), plaintiffs would have to prove that:
(1) defendant supplied the dangerous instrumentality; (2) the instrumentality was unsafe when put to its reasonably expected use; (3) the instrumentality was put to its reasonably expected use; (4) defendant had no reason to believe that the user would realize its dangerous condition; (5) defendant knew or had information from which defendant, exercising ordinary care, should have known of the dangerous condition; (6) defendant failed to adequately warn of the dangerous condition; (7) defendant was thereby negligent; and (8) plaintiffs were injured as a direct result.
. Although
Rothermich v. Union Planters Nat’l Bank,
.Although there are two exceptions to the rule barring landowner liability, neither is applicable here. The first exception applies when the landowner substantially controls the physical activities of the employees involved or the manner in which the work is done such that the duty of care never shifts to the independent contractor.
Halmick v. SBC Corp. Services, Inc.,
. Although not dispositive, Green filed a claim for his injuries and received workers’ compensation benefits. Mouser also filed a claim, but he later voluntarily dismissed it.
. TME was liable under the Missouri Workers' Compensation Act because it was a corporation using the services of another for pay (Mo.Rev.Stat. § 287.030.1(1)), with five or more employees {id. § 287.030.1(3)), for injuries that occurred in Missouri {id. § 287.110.2). TME was therefore liable for personal’ injuries suffered by its employees ■ arising from the course of employment. Id. § 287.120.1.
